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Definitions and Managed Objects for Operations, Administration, and Maintenance (OAM) Functions on Ethernet-Like Interfaces.
M. Squire. June 2007.

 
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Network Working Group M. Squire Request for Comments: 4878 Hatteras Networks Category: Standards Track June 2007 Definitions and Managed Objects for Operations, Administration, and Maintenance (OAM) Functions on Ethernet-Like Interfaces Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract This document defines objects for managing Operations, Administration, and Maintenance (OAM) capabilities on Ethernet-like interfaces conformant to the Ethernet OAM functionality defined in the Ethernet in the First Mile (EFM) clauses of the Ethernet standards. The Ethernet OAM functionality is complementary to the Simple Network Management Protocol (SNMP) in that it is focused on a small set of link-specific functions for directly connected Ethernet interfaces. This document defines objects for controlling those link OAM functions and for providing results and status of the OAM functions to management entities. Squire Standards Track [Page 1]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Table of Contents 1. Introduction ....................................................2 2. The Internet-Standard Management Framework ......................2 3. Overview ........................................................3 3.1. Remote Fault Indication ....................................4 3.2. Link Monitoring ............................................4 3.3. Remote Loopback ............................................5 3.4. Ethernet OAM Protocol Data Units ...........................5 4. Relation to the Other MIB Modules ...............................5 4.1. Relation to Other MIB Modules ..............................5 4.2. Relation to Other EFM MIB Modules ..........................6 4.3. Mapping of IEEE 802.3ah Managed Objects ....................6 5. MIB Structure ...................................................7 6. MIB Definition ..................................................8 7. Security Considerations ........................................47 8. IANA Considerations ............................................49 9. References .....................................................49 9.1. Normative References ......................................49 9.2. Informative References ....................................50 10. Acknowledgments ...............................................51 1. Introduction The IEEE 802.3ah Ethernet in the First Mile (EFM) taskforce added new management capabilities to Ethernet-like interfaces. These management capabilities were introduced to provide some basic Ordered Aggregate (OA) function on Ethernet media. The defined functionality includes discovery, error signaling, loopback, and link monitoring. This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community to manage these new Ethernet interface capabilities. Conventions Used in This Document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 2. The Internet-Standard Management Framework For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Squire Standards Track [Page 2]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580]. 3. Overview Ethernet networks have evolved over the past 30 years from simple LANs to a variety of other applications, including wide-area networks. To address some of these emerging markets, the IEEE 802.3ah taskforce defined additional clauses in [802.3ah] for the IEEE 802.3 standard [802.3-2002] to better address Ethernet deployments in the public-access network. Although Ethernet-access deployments were the primary motivation for the taskforce activity, the results of the taskforce are not strictly limited to that application. Ethernet OAM can be implemented on Ethernet links that are not EFM. The Ethernet in the First Mile (EFM) taskforce was focused on four somewhat independent objectives to better address Ethernet access deployments: optics, copper, Ethernet passive optical networks (Ethernet PON, or EPON), and operations, administration, and maintenance (OAM). The optics sub-taskforce developed new optical physical layers that better served the long-reach outside plant networks typically found in the access network, including developing physical layers that operate up to 20 Km and supporting the environmental conditions of access deployments. The copper sub- taskforce developed two new physical layers that run Ethernet natively over existing twisted pair wires that have been supporting voice services for decades. The EPON sub-taskforce developed a new point-to-multipoint Ethernet physical layer, utilizing Ethernet framing natively over a time-division multiple-access (TDMA) infrastructure. The OAM sub-taskforce introduced some basic management functionality into an Ethernet link to better monitor and maintain Ethernet networks in geographically disparate networks. This document defines the management objects necessary to integrate Ethernet OAM functionality into the SNMP management framework. Ethernet OAM is composed of a core set of functions and a set of optional functional groups. The mandatory functions include discovery operations (determining if the other end of the link is OA capable and what OAM functions it supports), state machine implementation, and some critical event flows. The optional functional groups are for (a) link events, (b) remote loopback, and (c) variable retrieval and response. Each optional functional group is controlled by a separate MIB table(s). Squire Standards Track [Page 3]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Ethernet OAM is complementary with SNMP management in that it provides some basic management functions at layer two, rather than using layer three and above as required by SNMP over an IP infrastructure. Ethernet OAM provides single-hop functionality in that it works only between two directly connected Ethernet stations. SNMP can be used to manage the Ethernet OAM interactions of one Ethernet station with another. Ethernet OAM has three functional objectives, which are detailed in the next three sections. The definition of a basic Ethernet OA protocol data unit is given in Section 3.4. 3.1. Remote Fault Indication Remote fault indication provides a mechanism for one end of an Ethernet link to signal the other end that the receive path is non- operational. Some Ethernet physical layers offer mechanisms to signal this condition at the physical layer. Ethernet OAM added a mechanism so that some Ethernet physical layers can operate in unidirectional mode, allowing frames to be transmitted in one direction even when the other direction is non-operational. Traditionally, Ethernet PHYs do not allow frame transmission in one direction if the other direction is not operational. Using this mode, Ethernet OAM allows frame-based signaling of remote fault conditions while still not allowing higher-layer applications to be aware of the unidirectional capability. This document includes mechanisms for capturing that fault information and reflecting such information in objects and notifications within the SNMP management framework. 3.2. Link Monitoring Ethernet OAM includes event signaling capability so that one end of an Ethernet link can indicate the occurrence of certain important events to the other end of the link. This happens via layer two protocols. This document defines methods for incorporating the occurrence of these layer two events, both at the local end and far end of the link, into the SNMP management framework. Ethernet OAM also includes mechanisms for one Ethernet station to query another directly connected Ethernet station about the status of its Ethernet interface variables and status. This document does not include mechanisms for controlling how one Ethernet endpoint may use this functionality to query the status or statistics of a peer Ethernet entity. Squire Standards Track [Page 4]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 3.3. Remote Loopback Remote loopback is a link state where the peer Ethernet entity echoes every received packet (without modifications) back onto the link. Remote loopback is intrusive in that the other end of the link is not forwarding traffic from higher layers out over the link. This document defines objects controlling loopback operation and reading the status of the loopback state. 3.4. Ethernet OAM Protocol Data Units An Ethernet OAM protocol data unit is a valid Ethernet frame with a destination Media Access Control (MAC) address equal to the reserved MAC address for Slow Protocols (See 43B of [802.3ah]), a lengthOrType field equal to the reserved type for Slow Protocols, and a Slow Protocols subtype equal to that of the subtype reserved for Ethernet OAM. OAMPDU is used throughout this document as an abbreviation for Ethernet OAM protocol data unit. OAMPDUs are the mechanism by which two directly connected Ethernet interfaces exchange OA information. 4. Relation to the Other MIB Modules The definitions presented here are based on Clauses 30 and 57 of [802.3ah]. Note that these clauses describe many of these variables and their effects on the MAC layer. In some cases, there is a one- to-one relationship between an object in this document and an object in the Clause 30 MIB of [802.3ah]. In other cases, the objects of this document reflect a more complex entity and are reflected by more than one object in the Clause 30 MIB of [802.3ah]. 4.1. Relation to Other MIB Modules The objects defined in this document manage OAM functionality introduced in [802.3ah] These objects do not overlap with the interfaces MIB [RFC2863], the Ethernet-like interfaces MIB [RFC3635], or any other MIB currently used to manage various aspects of an Ethernet interface. The objects defined here are defined for Ethernet-like interfaces only and use the same ifIndex as the associated Ethernet interface. Ethernet OAM can be implemented on any Ethernet-like interface. Squire Standards Track [Page 5]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 4.2. Relation to Other EFM MIB Modules The Ethernet OAM functionality and MIB Module is independent of the other functionality and MIB Modules derived from [802.3ah] for copper [802.3ah-copper] and EPON [802.3ah-epon]. Ethernet OAM may be implemented (or not) on the new EFM interface types, just as it can on any other Ethernet interface. 4.3. Mapping of IEEE 802.3ah Managed Objects This section contains the mapping between managed objects defined in [802.3ah] Clause 30, and managed objects defined in this document. IEEE 802.3 Managed Object Corresponding SNMP object oOA .aOAMID IF-MIB ifIndex .aOAMAdminState dot3OamAdminState .aOAMMode dot3OamMode .aOAMDiscoveryState dot3OamOperStatus .aOAMRemoteMACAddress dot3OamPeerMacAddress .aOAMLocalConfiguration dot3OamFunctionsSupported .aOAMRemoteConfiguration dot3OamPeerFunctionsSupported, dot3OamPeerMode .aOAMLocalPDUConfiguration dot3OamMaxOamPduSize .aOAMRemotePDUConfiguration dot3OamPeerMaxOamPduSize .aOAMLocalFlagsField dot3OamOperStatus, dot3OamEventLogEntry .aOAMRemoteFlagsField dot3OamOperStatus, dot3OamEventLogEntry .aOAMLocalRevision dot3OamConfigRevision .aOAMRemoteRevision dot3OamPeerConfigRevision .aOAMLocalState dot3OamLoopbackStatus .aOAMRemoteState dot3OamLoopbackStatus .aOAMRemoteVendorOUI dot3OamPeerVendorOui .aOAMRemoteVendorSpecificInfo dot3OamPeerVendorInfo .aOAMUnsupportedCodesTx dot3OamUnsupportedCodesTx .aOAMUnsupportedCodesRx dot3OamUnsupportedCodesRx .aOAMInformationTx dot3OamInformationTx .aOAMInformationRx dot3OamInformationRx .aOAMUniqueEventNotificationTx dot3OamUniqueEventNotificationTx .aOAMUniqueEventNotificationRx dot3OamUniqueEventNotificationRx .aOAMDuplicateEventNotificationTx dot3OamDuplicateEventNotificationTx .aOAMDuplicateEventNotificationRx dot3OamDuplicateEventNotificationRx .aOAMLoopbackControlTx dot3OamLoopbackControlTx Squire Standards Track [Page 6]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 .aOAMLoopbackControlRx dot3OamLoopbackControlRx .aOAMVariableRequestTx dot3OamVariableRequestTx .aOAMVariableRequestRx dot3OamVariableRequestRx .aOAMVariableResponseTx dot3OamVariableResponseTx .aOAMVariableResponseRx dot3OamVariableResponseRx .aOAMOrganizationSpecificTx dot3OamOrgSpecificTx .aOAMOrganizationSpecificRx dot3OamOrgSpecificTx .aOAMLocalErrSymPeriodConfig dot3OamErrSymPeriodWindow, dot3OamErrSymPeriodThreshold .aOAMLocalErrSymPeriodEvent dot3OamEventLogEntry .aOAMLocalErrFrameConfig dot3OamErrFrameWindow, dot3OamErrFrameThreshold .aOAMLocalErrFrameEvent dot3OamEventLogEntry .aOAMLocalErrFramePeriodConfig dot3OamErrFramePeriodWindow, dot3OamErrFramePeriodThreshold .aOAMLocalErrFramePeriodEvent dot3OamEventLogEntry .aOAMLocalErrFrameSecsSummaryConfig dot3OamErrFrameSecsSummaryWindow, dot3OamErrFrameSecssummaryThreshold .aOAMLocalErrFrameSecsSummaryEvent dot3OamEventLogEntry .aOAMRemoteErrSymPeriodEvent dot3OamEventLogEntry .aOAMRemoteErrFrameEvent dot3OamEventLogEntry .aOAMRemoteErrFramePeriodEvent dot3OamEventLogEntry .aOAMRemoteErrFrameSecsSummaryEvent dot3OamEventLogEntry .aFramesLostDueToOAmError dot3OamFramesLostDueToOam .acOAMAdminControl dot3OamAdminState There are no IEEE 802.3ah managed objects that are not reflected in this MIB Module in some manner. 5. MIB Structure The Ethernet OAM MIB objects of this memo focus on the OA capabilities introduced in [802.3ah]. The MIB objects are partitioned into six different MIB groups. The dot3OamTable group manages the primary OAM objects of the Ethernet interface. This group controls the state and status of OA as well as the mode in which it operates. The dot3OamPeerTable maintains the current information on the status and configuration of the peer OAM entity on the Ethernet interface. Managed information includes the capabilities and function available on the peer OAM entity. Squire Standards Track [Page 7]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 The dot3OamLoopbackTable manages the loopback function introduced in [802.3ah]. This table controls enabling and disabling loopback, as well as indicating the loopback status of Ethernet OAM on this interface. The dot3OamStatsTable maintains statistics on the number and type of Ethernet OAM frames being transmitted and received on the Ethernet interface. The dot3OamEventConfigTable defines the objects for managing the event notification capability available in Ethernet OAM. With Ethernet OAM, one device may send notifications to its peer devices whenever an important event happens on the local device. This table provides management of which events result in notifications via Ethernet OAM notifications and/or via SNMP notifications. The dot3OamEventLogTable manages the current status of local and remote events detected via Ethernet OAM. This table is updated whenever local events are detected by Ethernet OAM or whenever Ethernet OAM Event Notifications are received from the peer OA entity. There are two notifications defined to report Ethernet OAM events (one for threshold crossing events, one for non-threshold crossing events). Both notifications are contained within the same conformance group. 6. MIB Definition DOT3-OAM-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, mib-2, OBJECT-TYPE, Counter32, Unsigned32, Integer32, NOTIFICATION-TYPE FROM SNMPv2-SMI -- from [RFC2578] TEXTUAL-CONVENTION, MacAddress, TimeStamp, TruthValue FROM SNMPv2-TC -- from [RFC2579] CounterBasedGauge64 FROM HCNUM-TC -- from [RFC2856] ifIndex FROM IF-MIB -- from [RFC2863] MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF; Squire Standards Track [Page 8]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 -- from [RFC2580] dot3OamMIB MODULE-IDENTITY LAST-UPDATED "200706140000Z" -- June 14,2007" ORGANIZATION "IETF Ethernet Interfaces and Hub MIB Working Group" CONTACT-INFO "WG Charter: http://www.ietf.org/html.charters/hubmib-charter.html Mailing lists: General Discussion: hubmib@ietf.org To Subscribe: hubmib-requests@ietf.org In Body: subscribe your_email_address Chair: Bert Wijnen Alcatel-Lucent Email: bwijnen at alcatel-lucent dot com Editor: Matt Squire Hatteras Networks E-mail: msquire at hatterasnetworks dot com " DESCRIPTION "The MIB module for managing the new Ethernet OAM features introduced by the Ethernet in the First Mile taskforce (IEEE 802.3ah). The functionality presented here is based on IEEE 802.3ah [802.3ah], released in October, 2004. [802.3ah] was prepared as an addendum to the standing version of IEEE 802.3 [802.3-2002]. Since then, [802.3ah] has been merged into the base IEEE 802.3 specification in [802.3-2005]. In particular, this MIB focuses on the new OAM functions introduced in Clause 57 of [802.3ah]. The OAM functionality of Clause 57 is controlled by new management attributes introduced in Clause 30 of [802.3ah]. The OAM functions are not specific to any particular Ethernet physical layer, and can be generically applied to any Ethernet interface of [802.3-2002]. An Ethernet OAM protocol data unit is a valid Ethernet frame with a destination MAC address equal to the reserved MAC address for Slow Protocols (See 43B of [802.3ah]), a lengthOrType field equal to the reserved type for Slow Protocols, and a Slow Protocols subtype equal to that of the subtype reserved for Ethernet OAM. OAMPDU is used throughout this document as an abbreviation for Ethernet OAM protocol data unit. The following reference is used throughout this MIB module: Squire Standards Track [Page 9]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 [802.3ah] refers to: IEEE Std 802.3ah-2004: 'Draft amendment to - Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications - Media Access Control Parameters, Physical Layers and Management Parameters for subscriber access networks', October 2004. [802.3-2002] refers to: IEEE Std 802.3-2002: 'Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications - Media Access Control Parameters, Physical Layers and Management Parameters for subscriber access networks', March 2002. [802.3-2005] refers to: IEEE Std 802.3-2005: 'Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications - Media Access Control Parameters, Physical Layers and Management Parameters for subscriber access networks', December 2005. [802-2001] refers to: 'IEEE Standard for LAN/MAN (Local Area Network/Metropolitan Area Network): Overview and Architecture', IEEE 802, June 2001. Copyright (c) The IETF Trust (2007). This version of this MIB module is part of RFC 4878; See the RFC itself for full legal notices. " REVISION "200706140000Z" -- June 14, 2007" DESCRIPTION "Initial version, published as RFC 4878." ::= { mib-2 158 } -- -- Sections of the Ethernet OAM MIB Squire Standards Track [Page 10]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 -- dot3OamNotifications OBJECT IDENTIFIER ::= { dot3OamMIB 0 } dot3OamObjects OBJECT IDENTIFIER ::= { dot3OamMIB 1 } dot3OamConformance OBJECT IDENTIFIER ::= { dot3OamMIB 2 } -- -- Textual conventions for the OAM MIB -- EightOTwoOui ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "24-bit Organizationally Unique Identifier. Information on OUIs can be found in IEEE 802-2001 [802-2001], Clause 9." SYNTAX OCTET STRING(SIZE(3)) -- *************************************************************** -- -- Ethernet OAM Control group -- dot3OamTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot3OamEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains the primary controls and status for the OAM capabilities of an Ethernet-like interface. There will be one row in this table for each Ethernet-like interface in the system that supports the OAM functions defined in [802.3ah]. " ::= { dot3OamObjects 1 } dot3OamEntry OBJECT-TYPE SYNTAX Dot3OamEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the table that contains information on the Ethernet OAM function for a single Ethernet like interface. Entries in the table are created automatically for each interface supporting Ethernet OAM. The status of the row entry can be determined from dot3OamOperStatus. A dot3OamEntry is indexed in the dot3OamTable by the ifIndex object of the Interfaces MIB. " INDEX { ifIndex } ::= { dot3OamTable 1 } Squire Standards Track [Page 11]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Dot3OamEntry ::= SEQUENCE { dot3OamAdminState INTEGER, dot3OamOperStatus INTEGER, dot3OamMode INTEGER, dot3OamMaxOamPduSize Unsigned32, dot3OamConfigRevision Unsigned32, dot3OamFunctionsSupported BITS } dot3OamAdminState OBJECT-TYPE SYNTAX INTEGER { enabled(1), disabled(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "This object is used to provision the default administrative OAM mode for this interface. This object represents the desired state of OAM for this interface. The dot3OamAdminState always starts in the disabled(2) state until an explicit management action or configuration information retained by the system causes a transition to the enabled(1) state. When enabled(1), Ethernet OAM will attempt to operate over this interface. " REFERENCE "[802.3ah], 30.3.6.1.2" ::= { dot3OamEntry 1 } dot3OamOperStatus OBJECT-TYPE SYNTAX INTEGER { disabled(1), linkFault(2), passiveWait(3), activeSendLocal(4), sendLocalAndRemote(5), sendLocalAndRemoteOk(6), oamPeeringLocallyRejected(7), oamPeeringRemotelyRejected(8), operational(9), nonOperHalfDuplex(10) } MAX-ACCESS read-only STATUS current DESCRIPTION "At initialization and failure conditions, two OAM entities on Squire Standards Track [Page 12]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 the same full-duplex Ethernet link begin a discovery phase to determine what OAM capabilities may be used on that link. The progress of this initialization is controlled by the OA sublayer. This value is always disabled(1) if OAM is disabled on this interface via the dot3OamAdminState. If the link has detected a fault and is transmitting OAMPDUs with a link fault indication, the value is linkFault(2). Also, if the interface is not operational (ifOperStatus is not up(1)), linkFault(2) is returned. Note that the object ifOperStatus may not be up(1) as a result of link failure or administrative action (ifAdminState being down(2) or testing(3)). The passiveWait(3) state is returned only by OAM entities in passive mode (dot3OamMode) and reflects the state in which the OAM entity is waiting to see if the peer device is OA capable. The activeSendLocal(4) value is used by active mode devices (dot3OamMode) and reflects the OAM entity actively trying to discover whether the peer has OAM capability but has not yet made that determination. The state sendLocalAndRemote(5) reflects that the local OA entity has discovered the peer but has not yet accepted or rejected the configuration of the peer. The local device can, for whatever reason, decide that the peer device is unacceptable and decline OAM peering. If the local OAM entity rejects the peer OAM entity, the state becomes oamPeeringLocallyRejected(7). If the OAM peering is allowed by the local device, the state moves to sendLocalAndRemoteOk(6). Note that both the sendLocalAndRemote(5) and oamPeeringLocallyRejected(7) states fall within the state SEND_LOCAL_REMOTE of the Discovery state diagram [802.3ah, Figure 57-5], with the difference being whether the local OAM client has actively rejected the peering or has just not indicated any decision yet. Whether a peering decision has been made is indicated via the local flags field in the OAMPDU (reflected in the aOAMLocalFlagsField of 30.3.6.1.10). If the remote OAM entity rejects the peering, the state becomes oamPeeringRemotelyRejected(8). Note that both the sendLocalAndRemoteOk(6) and oamPeeringRemotelyRejected(8) states fall within the state SEND_LOCAL_REMOTE_OK of the Discovery state diagram [802.3ah, Figure 57-5], with the difference being whether the remote OAM client has rejected Squire Standards Track [Page 13]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 the peering or has just not yet decided. This is indicated via the remote flags field in the OAMPDU (reflected in the aOAMRemoteFlagsField of 30.3.6.1.11). When the local OAM entity learns that both it and the remote OAM entity have accepted the peering, the state moves to operational(9) corresponding to the SEND_ANY state of the Discovery state diagram [802.3ah, Figure 57-5]. Since Ethernet OAM functions are not designed to work completely over half-duplex interfaces, the value nonOperHalfDuplex(10) is returned whenever Ethernet OAM is enabled (dot3OamAdminState is enabled(1)), but the interface is in half-duplex operation. " REFERENCE "[802.3ah], 30.3.6.1.4, 30.3.6.1.10, 30.3.6.1.11" ::= { dot3OamEntry 2 } dot3OamMode OBJECT-TYPE SYNTAX INTEGER { passive(1), active(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "This object configures the mode of OAM operation for this Ethernet-like interface. OAM on Ethernet interfaces may be in 'active' mode or 'passive' mode. These two modes differ in that active mode provides additional capabilities to initiate monitoring activities with the remote OAM peer entity, while passive mode generally waits for the peer to initiate OA actions with it. As an example, an active OAM entity can put the remote OAM entity in a loopback state, where a passive OA entity cannot. The default value of dot3OamMode is dependent on the type of system on which this Ethernet-like interface resides. The default value should be 'active(2)' unless it is known that this system should take on a subservient role to the other device connected over this interface. Changing this value results in incrementing the configuration revision field of locally generated OAMPDUs (30.3.6.1.12) and potentially re-doing the OAM discovery process if the dot3OamOperStatus was already operational(9). " REFERENCE "[802.3ah], 30.3.6.1.3" Squire Standards Track [Page 14]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 ::= { dot3OamEntry 3 } dot3OamMaxOamPduSize OBJECT-TYPE SYNTAX Unsigned32 (64..1518) UNITS "octets" MAX-ACCESS read-only STATUS current DESCRIPTION "The largest OAMPDU that the OAM entity supports. OA entities exchange maximum OAMPDU sizes and negotiate to use the smaller of the two maximum OAMPDU sizes between the peers. This value is determined by the local implementation. " REFERENCE "[802.3ah], 30.3.6.1.8" ::= { dot3OamEntry 4 } dot3OamConfigRevision OBJECT-TYPE SYNTAX Unsigned32(0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The configuration revision of the OAM entity as reflected in the latest OAMPDU sent by the OAM entity. The config revision is used by OAM entities to indicate that configuration changes have occurred, which might require the peer OAM entity to re-evaluate whether OAM peering is allowed. " REFERENCE "[802.3ah], 30.3.6.1.12" ::= { dot3OamEntry 5 } dot3OamFunctionsSupported OBJECT-TYPE SYNTAX BITS { unidirectionalSupport (0), loopbackSupport(1), eventSupport(2), variableSupport(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "The OAM functions supported on this Ethernet-like interface. OAM consists of separate functional sets beyond the basic discovery process that is always required. These functional groups can be supported independently by any implementation. These values are communicated to the peer via the local configuration field of Information OAMPDUs. Setting 'unidirectionalSupport(0)' indicates that the OA Squire Standards Track [Page 15]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 entity supports the transmission of OAMPDUs on links that are operating in unidirectional mode (traffic flowing in one direction only). Setting 'loopbackSupport(1)' indicates that the OAM entity can initiate and respond to loopback commands. Setting 'eventSupport(2)' indicates that the OAM entity can send and receive Event Notification OAMPDUs. Setting 'variableSupport(3)' indicates that the OAM entity can send and receive Variable Request and Response OAMPDUs. " REFERENCE "[802.3ah], 30.3.6.1.6" ::= { dot3OamEntry 6 } -- *************************************************************** -- -- Ethernet OAM Peer group -- dot3OamPeerTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot3OamPeerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains information about the OAM peer for a particular Ethernet-like interface. OAM entities communicate with a single OAM peer entity on Ethernet links on which OA is enabled and operating properly. There is one entry in this table for each entry in the dot3OamTable for which information on the peer OAM entity is available. " ::= { dot3OamObjects 2 } dot3OamPeerEntry OBJECT-TYPE SYNTAX Dot3OamPeerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the table containing information on the peer OA entity for a single Ethernet-like interface. Note that there is at most one OAM peer for each Ethernet-like interface. Entries are automatically created when information about the OAM peer entity becomes available, and automatically deleted when the OAM peer entity is no longer in communication. Peer information is not available when dot3OamOperStatus is disabled(1), linkFault(2), passiveWait(3), activeSendLocal(4), or nonOperHalfDuplex(10). " INDEX { ifIndex } Squire Standards Track [Page 16]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 ::= { dot3OamPeerTable 1 } Dot3OamPeerEntry ::= SEQUENCE { dot3OamPeerMacAddress MacAddress, dot3OamPeerVendorOui EightOTwoOui, dot3OamPeerVendorInfo Unsigned32, dot3OamPeerMode INTEGER, dot3OamPeerMaxOamPduSize Unsigned32, dot3OamPeerConfigRevision Unsigned32, dot3OamPeerFunctionsSupported BITS } dot3OamPeerMacAddress OBJECT-TYPE SYNTAX MacAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The MAC address of the peer OAM entity. The MAC address is derived from the most recently received OAMPDU. " REFERENCE "[802.3ah], 30.3.6.1.5." ::= { dot3OamPeerEntry 1 } dot3OamPeerVendorOui OBJECT-TYPE SYNTAX EightOTwoOui MAX-ACCESS read-only STATUS current DESCRIPTION "The OUI of the OAM peer as reflected in the latest Information OAMPDU received with a Local Information TLV. The OUI can be used to identify the vendor of the remote OA entity. This value is initialized to three octets of zero before any Local Information TLV is received. " REFERENCE "[802.3ah], 30.3.6.1.16." ::= { dot3OamPeerEntry 2 } dot3OamPeerVendorInfo OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "The Vendor Info of the OAM peer as reflected in the latest Information OAMPDU received with a Local Information TLV. The semantics of the Vendor Information field is proprietary and specific to the vendor (identified by the dot3OamPeerVendorOui). This information could, for example, Squire Standards Track [Page 17]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 be used to identify a specific product or product family. This value is initialized to zero before any Local Information TLV is received. " REFERENCE "[802.3ah], 30.3.6.1.17." ::= { dot3OamPeerEntry 3 } dot3OamPeerMode OBJECT-TYPE SYNTAX INTEGER { passive(1), active(2), unknown(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "The mode of the OAM peer as reflected in the latest Information OAMPDU received with a Local Information TLV. The mode of the peer can be determined from the Configuration field in the Local Information TLV of the last Information OAMPDU received from the peer. The value is unknown(3) whenever no Local Information TLV has been received. The values of active(2) and passive(1) are returned when a Local Information TLV has been received indicating that the peer is in active or passive mode, respectively. " REFERENCE "[802.3ah], 30.3.6.1.7." ::= { dot3OamPeerEntry 4 } dot3OamPeerMaxOamPduSize OBJECT-TYPE SYNTAX Unsigned32 (0 | 64..1518) UNITS "octets" MAX-ACCESS read-only STATUS current DESCRIPTION "The maximum size of OAMPDU supported by the peer as reflected in the latest Information OAMPDU received with a Local Information TLV. Ethernet OAM on this interface must not use OAMPDUs that exceed this size. The maximum OAMPDU size can be determined from the PDU Configuration field of the Local Information TLV of the last Information OAMPDU received from the peer. A value of zero is returned if no Local Information TLV has been received. Otherwise, the value of the OAM peer's maximum OAMPDU size is returned in this value. " REFERENCE "[802.3ah], 30.3.6.1.9." ::= { dot3OamPeerEntry 5 } Squire Standards Track [Page 18]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 dot3OamPeerConfigRevision OBJECT-TYPE SYNTAX Unsigned32(0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The configuration revision of the OAM peer as reflected in the latest OAMPDU. This attribute is changed by the peer whenever it has a local configuration change for Ethernet OA on this interface. The configuration revision can be determined from the Revision field of the Local Information TLV of the most recently received Information OAMPDU with a Local Information TLV. A value of zero is returned if no Local Information TLV has been received. " REFERENCE "[802.3ah], 30.3.6.1.13." ::= { dot3OamPeerEntry 6 } dot3OamPeerFunctionsSupported OBJECT-TYPE SYNTAX BITS { unidirectionalSupport (0), loopbackSupport(1), eventSupport(2), variableSupport(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "The OAM functions supported on this Ethernet-like interface. OAM consists of separate functionality sets above the basic discovery process. This value indicates the capabilities of the peer OAM entity with respect to these functions. This value is initialized so all bits are clear. If unidirectionalSupport(0) is set, then the peer OAM entity supports sending OAM frames on Ethernet interfaces when the receive path is known to be inoperable. If loopbackSupport(1) is set, then the peer OAM entity can send and receive OAM loopback commands. If eventSupport(2) is set, then the peer OAM entity can send and receive event OAMPDUs to signal various error conditions. If variableSupport(3) is set, then the peer OAM entity can send and receive variable requests to monitor the attribute value as described in Clause 57 of [802.3ah]. The capabilities of the OAM peer can be determined from the configuration field of the Local Information TLV of the most recently received Information OAMPDU with a Local Information TLV. All zeros are returned if no Local Information TLV has Squire Standards Track [Page 19]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 yet been received. " REFERENCE "[802.3ah], REFERENCE 30.3.6.1.7." ::= { dot3OamPeerEntry 7 } -- *************************************************************** -- -- Ethernet OAM Loopback group -- dot3OamLoopbackTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot3OamLoopbackEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains controls for the loopback state of the local link as well as indicates the status of the loopback function. There is one entry in this table for each entry in dot3OamTable that supports loopback functionality (where dot3OamFunctionsSupported includes the loopbackSupport bit set). Loopback can be used to place the remote OAM entity in a state where every received frame (except OAMPDUs) is echoed back over the same interface on which they were received. In this state, at the remote entity, 'normal' traffic is disabled as only the looped back frames are transmitted on the interface. Loopback is thus an intrusive operation that prohibits normal data flow and should be used accordingly. " ::= { dot3OamObjects 3 } dot3OamLoopbackEntry OBJECT-TYPE SYNTAX Dot3OamLoopbackEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the table, containing information on the loopback status for a single Ethernet-like interface. Entries in the table are automatically created whenever the local OAM entity supports loopback capabilities. The loopback status on the interface can be determined from the dot3OamLoopbackStatus object. " INDEX { ifIndex } ::= { dot3OamLoopbackTable 1 } Dot3OamLoopbackEntry ::= Squire Standards Track [Page 20]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 SEQUENCE { dot3OamLoopbackStatus INTEGER, dot3OamLoopbackIgnoreRx INTEGER } dot3OamLoopbackStatus OBJECT-TYPE SYNTAX INTEGER { -- all values, except where noted, can be read -- but cannot be written noLoopback (1), -- initiatingLoopback can be read or written initiatingLoopback (2), remoteLoopback (3), -- terminatingLoopback can be read or written terminatingLoopback (4), localLoopback (5), unknown (6) } MAX-ACCESS read-write STATUS current DESCRIPTION "The loopback status of the OAM entity. This status is determined by a combination of the local parser and multiplexer states, the remote parser and multiplexer states, as well as by the actions of the local OAM client. When operating in normal mode with no loopback in progress, the status reads noLoopback(1). The values initiatingLoopback(2) and terminatingLoopback(4) can be read or written. The other values can only be read - they can never be written. Writing initiatingLoopback causes the local OAM entity to start the loopback process with its peer. This value can only be written when the status is noLoopback(1). Writing the value initiatingLoopback(2) in any other state has no effect. When in remoteLoopback(3), writing terminatingLoopback(4) causes the local OAM entity to initiate the termination of the loopback state. Writing terminatingLoopack(4) in any other state has no effect. If the OAM client initiates a loopback and has sent a Loopback OAMPDU and is waiting for a response, where the local parser and multiplexer states are DISCARD (see [802.3ah, 57.2.11.1]), the status is 'initiatingLoopback'. In this case, the local OAM entity has yet to receive any acknowledgment that the remote OAM entity has received its loopback command request. Squire Standards Track [Page 21]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 If the local OAM client knows that the remote OAM entity is in loopback mode (via the remote state information as described in [802.3ah, 57.2.11.1, 30.3.6.1.15]), the status is remoteLoopback(3). If the local OAM client is in the process of terminating the remote loopback [802.3ah, 57.2.11.3, 30.3.6.1.14] with its local multiplexer and parser states in DISCARD, the status is terminatingLoopback(4). If the remote OAM client has put the local OAM entity in loopback mode as indicated by its local parser state, the status is localLoopback(5). The unknown(6) status indicates that the parser and multiplexer combination is unexpected. This status may be returned if the OAM loopback is in a transition state but should not persist. The values of this attribute correspond to the following values of the local and remote parser and multiplexer states. value LclPrsr LclMux RmtPrsr RmtMux noLoopback FWD FWD FWD FWD initLoopback DISCARD DISCARD FWD FWD rmtLoopback DISCARD FWD LPBK DISCARD tmtngLoopback DISCARD DISCARD LPBK DISCARD lclLoopback LPBK DISCARD DISCARD FWD unknown *** any other combination *** " REFERENCE "[802.3ah], REFERENCE 57.2.11, 30.3.61.14, 30.3.6.1.15" ::= { dot3OamLoopbackEntry 1 } dot3OamLoopbackIgnoreRx OBJECT-TYPE SYNTAX INTEGER { ignore(1), process(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "Since OAM loopback is a disruptive operation (user traffic does not pass), this attribute provides a mechanism to provide controls over whether received OAM loopback commands are processed or ignored. When the value is ignore(1), received loopback commands are ignored. When the value is process(2), OAM loopback commands are processed. The default value is to ignore loopback commands (ignore(1)). " REFERENCE "[802.3ah], REFERENCE 57.2.11, 30.3.61.14, 30.3.6.1.15" ::= { dot3OamLoopbackEntry 2 } Squire Standards Track [Page 22]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 -- *************************************************************** -- -- Ethernet OAM Statistics group -- dot3OamStatsTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot3OamStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains statistics for the OAM function on a particular Ethernet-like interface. There is an entry in the table for every entry in the dot3OamTable. The counters in this table are defined as 32-bit entries to match the counter size as defined in [802.3ah]. Given that the OA protocol is a slow protocol, the counters increment at a slow rate. " ::= { dot3OamObjects 4 } dot3OamStatsEntry OBJECT-TYPE SYNTAX Dot3OamStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the table containing statistics information on the Ethernet OAM function for a single Ethernet-like interface. Entries are automatically created for every entry in the dot3OamTable. Counters are maintained across transitions in dot3OamOperStatus. " INDEX { ifIndex } ::= { dot3OamStatsTable 1 } Dot3OamStatsEntry ::= SEQUENCE { dot3OamInformationTx Counter32, dot3OamInformationRx Counter32, dot3OamUniqueEventNotificationTx Counter32, dot3OamUniqueEventNotificationRx Counter32, dot3OamDuplicateEventNotificationTx Counter32, dot3OamDuplicateEventNotificationRx Counter32, dot3OamLoopbackControlTx Counter32, dot3OamLoopbackControlRx Counter32, dot3OamVariableRequestTx Counter32, dot3OamVariableRequestRx Counter32, dot3OamVariableResponseTx Counter32, Squire Standards Track [Page 23]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 dot3OamVariableResponseRx Counter32, dot3OamOrgSpecificTx Counter32, dot3OamOrgSpecificRx Counter32, dot3OamUnsupportedCodesTx Counter32, dot3OamUnsupportedCodesRx Counter32, dot3OamFramesLostDueToOam Counter32 } dot3OamInformationTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Information OAMPDUs transmitted on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.20." ::= { dot3OamStatsEntry 1 } dot3OamInformationRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Information OAMPDUs received on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.21." ::= { dot3OamStatsEntry 2 } dot3OamUniqueEventNotificationTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of unique Event OAMPDUs transmitted on this interface. Event Notifications may be sent in duplicate to increase the probability of successfully being received, Squire Standards Track [Page 24]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 given the possibility that a frame may be lost in transit. Duplicate Event Notification transmissions are counted by dot3OamDuplicateEventNotificationTx. A unique Event Notification OAMPDU is indicated as an Event Notification OAMPDU with a Sequence Number field that is distinct from the previously transmitted Event Notification OAMPDU Sequence Number. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.22." ::= { dot3OamStatsEntry 3 } dot3OamUniqueEventNotificationRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of unique Event OAMPDUs received on this interface. Event Notification OAMPDUs may be sent in duplicate to increase the probability of successfully being received, given the possibility that a frame may be lost in transit. Duplicate Event Notification receptions are counted by dot3OamDuplicateEventNotificationRx. A unique Event Notification OAMPDU is indicated as an Event Notification OAMPDU with a Sequence Number field that is distinct from the previously received Event Notification OAMPDU Sequence Number. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.24." ::= { dot3OamStatsEntry 4 } dot3OamDuplicateEventNotificationTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of duplicate Event OAMPDUs transmitted Squire Standards Track [Page 25]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 on this interface. Event Notification OAMPDUs may be sent in duplicate to increase the probability of successfully being received, given the possibility that a frame may be lost in transit. A duplicate Event Notification OAMPDU is indicated as an Event Notification OAMPDU with a Sequence Number field that is identical to the previously transmitted Event Notification OAMPDU Sequence Number. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.23." ::= { dot3OamStatsEntry 5 } dot3OamDuplicateEventNotificationRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of duplicate Event OAMPDUs received on this interface. Event Notification OAMPDUs may be sent in duplicate to increase the probability of successfully being received, given the possibility that a frame may be lost in transit. A duplicate Event Notification OAMPDU is indicated as an Event Notification OAMPDU with a Sequence Number field that is identical to the previously received Event Notification OAMPDU Sequence Number. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.25." ::= { dot3OamStatsEntry 6 } dot3OamLoopbackControlTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Loopback Control OAMPDUs transmitted Squire Standards Track [Page 26]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.26." ::= { dot3OamStatsEntry 7 } dot3OamLoopbackControlRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Loopback Control OAMPDUs received on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.27." ::= { dot3OamStatsEntry 8 } dot3OamVariableRequestTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Variable Request OAMPDUs transmitted on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.28." ::= { dot3OamStatsEntry 9 } dot3OamVariableRequestRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Variable Request OAMPDUs received on Squire Standards Track [Page 27]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.29." ::= { dot3OamStatsEntry 10 } dot3OamVariableResponseTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Variable Response OAMPDUs transmitted on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.30." ::= { dot3OamStatsEntry 11 } dot3OamVariableResponseRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Variable Response OAMPDUs received on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.31." ::= { dot3OamStatsEntry 12 } dot3OamOrgSpecificTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Organization Specific OAMPDUs Squire Standards Track [Page 28]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 transmitted on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.32." ::= { dot3OamStatsEntry 13 } dot3OamOrgSpecificRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of Organization Specific OAMPDUs received on this interface. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.33." ::= { dot3OamStatsEntry 14 } dot3OamUnsupportedCodesTx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of OAMPDUs transmitted on this interface with an unsupported op-code. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.18." ::= { dot3OamStatsEntry 15 } dot3OamUnsupportedCodesRx OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of OAMPDUs received on this interface Squire Standards Track [Page 29]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 with an unsupported op-code. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.19." ::= { dot3OamStatsEntry 16 } dot3OamFramesLostDueToOam OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "A count of the number of frames that were dropped by the OA multiplexer. Since the OAM multiplexer has multiple inputs and a single output, there may be cases where frames are dropped due to transmit resource contention. This counter is incremented whenever a frame is dropped by the OAM layer. Note that any Ethernet frame, not just OAMPDUs, may be dropped by the OAM layer. This can occur when an OAMPDU takes precedence over a 'normal' frame resulting in the 'normal' frame being dropped. When this counter is incremented, no other counters in this MIB are incremented. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. " REFERENCE "[802.3ah], 30.3.6.1.46." ::= { dot3OamStatsEntry 17 } -- *************************************************************** -- -- Ethernet OAM Event Configuration group -- dot3OamEventConfigTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot3OamEventConfigEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Ethernet OAM includes the ability to generate and receive Event Notification OAMPDUs to indicate various link problems. This table contains the mechanisms to enable Event Squire Standards Track [Page 30]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Notifications and configure the thresholds to generate the standard Ethernet OAM events. There is one entry in the table for every entry in dot3OamTable that supports OAM events (where dot3OamFunctionsSupported includes the eventSupport bit set). The values in the table are maintained across changes to dot3OamOperStatus. The standard threshold crossing events are: - Errored Symbol Period Event. Generated when the number of symbol errors exceeds a threshold within a given window defined by a number of symbols (for example, 1,000 symbols out of 1,000,000 had errors). - Errored Frame Period Event. Generated when the number of frame errors exceeds a threshold within a given window defined by a number of frames (for example, 10 frames out of 1000 had errors). - Errored Frame Event. Generated when the number of frame errors exceeds a threshold within a given window defined by a period of time (for example, 10 frames in 1 second had errors). - Errored Frame Seconds Summary Event. Generated when the number of errored frame seconds exceeds a threshold within a given time period (for example, 10 errored frame seconds within the last 100 seconds). An errored frame second is defined as a 1 second interval which had >0 frame errors. There are other events (dying gasp, critical events) that are not threshold crossing events but which can be enabled/disabled via this table. " ::= { dot3OamObjects 5 } dot3OamEventConfigEntry OBJECT-TYPE SYNTAX Dot3OamEventConfigEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Entries are automatically created and deleted from this table, and exist whenever the OAM entity supports Ethernet OA events (as indicated by the eventSupport bit in dot3OamFunctionsSuppported). Values in the table are maintained across changes to the value of dot3OamOperStatus. Event configuration controls when the local management entity sends Event Notification OAMPDUs to its OAM peer, and when certain event flags are set or cleared in OAMPDUs. " INDEX { ifIndex } ::= { dot3OamEventConfigTable 1 } Squire Standards Track [Page 31]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Dot3OamEventConfigEntry ::= SEQUENCE { dot3OamErrSymPeriodWindowHi Unsigned32, dot3OamErrSymPeriodWindowLo Unsigned32, dot3OamErrSymPeriodThresholdHi Unsigned32, dot3OamErrSymPeriodThresholdLo Unsigned32, dot3OamErrSymPeriodEvNotifEnable TruthValue, dot3OamErrFramePeriodWindow Unsigned32, dot3OamErrFramePeriodThreshold Unsigned32, dot3OamErrFramePeriodEvNotifEnable TruthValue, dot3OamErrFrameWindow Unsigned32, dot3OamErrFrameThreshold Unsigned32, dot3OamErrFrameEvNotifEnable TruthValue, dot3OamErrFrameSecsSummaryWindow Integer32, dot3OamErrFrameSecsSummaryThreshold Integer32, dot3OamErrFrameSecsEvNotifEnable TruthValue, dot3OamDyingGaspEnable TruthValue, dot3OamCriticalEventEnable TruthValue } dot3OamErrSymPeriodWindowHi OBJECT-TYPE SYNTAX Unsigned32 UNITS "2^32 symbols" MAX-ACCESS read-write STATUS current DESCRIPTION "The two objects dot3OamErrSymPeriodWindowHi and dot3OamErrSymPeriodLo together form an unsigned 64-bit integer representing the number of symbols over which this threshold event is defined. This is defined as dot3OamErrSymPeriodWindow = ((2^32)*dot3OamErrSymPeriodWindowHi) + dot3OamErrSymPeriodWindowLo If dot3OamErrSymPeriodThreshold symbol errors occur within a window of dot3OamErrSymPeriodWindow symbols, an Event Notification OAMPDU should be generated with an Errored Symbol Period Event TLV indicating that the threshold has been crossed in this window. The default value for dot3OamErrSymPeriodWindow is the number of symbols in one second for the underlying physical layer. " REFERENCE "[802.3ah], 30.3.6.1.34" ::= { dot3OamEventConfigEntry 1 } dot3OamErrSymPeriodWindowLo OBJECT-TYPE SYNTAX Unsigned32 UNITS "symbols" Squire Standards Track [Page 32]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 MAX-ACCESS read-write STATUS current DESCRIPTION "The two objects dot3OamErrSymPeriodWindowHi and dot3OamErrSymPeriodWindowLo together form an unsigned 64-bit integer representing the number of symbols over which this threshold event is defined. This is defined as dot3OamErrSymPeriodWindow = ((2^32)*dot3OamErrSymPeriodWindowHi) + dot3OamErrSymPeriodWindowLo If dot3OamErrSymPeriodThreshold symbol errors occur within a window of dot3OamErrSymPeriodWindow symbols, an Event Notification OAMPDU should be generated with an Errored Symbol Period Event TLV indicating that the threshold has been crossed in this window. The default value for dot3OamErrSymPeriodWindow is the number of symbols in one second for the underlying physical layer. " REFERENCE "[802.3ah], 30.3.6.1.34" ::= { dot3OamEventConfigEntry 2 } dot3OamErrSymPeriodThresholdHi OBJECT-TYPE SYNTAX Unsigned32 UNITS "2^32 symbols" MAX-ACCESS read-write STATUS current DESCRIPTION "The two objects dot3OamErrSymPeriodThresholdHi and dot3OamErrSymPeriodThresholdLo together form an unsigned 64-bit integer representing the number of symbol errors that must occur within a given window to cause this event. This is defined as dot3OamErrSymPeriodThreshold = ((2^32) * dot3OamErrSymPeriodThresholdHi) + dot3OamErrSymPeriodThresholdLo If dot3OamErrSymPeriodThreshold symbol errors occur within a window of dot3OamErrSymPeriodWindow symbols, an Event Notification OAMPDU should be generated with an Errored Symbol Period Event TLV indicating that the threshold has been crossed in this window. The default value for dot3OamErrSymPeriodThreshold is one symbol errors. If the threshold value is zero, then an Event Squire Standards Track [Page 33]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Notification OAMPDU is sent periodically (at the end of every window). This can be used as an asynchronous notification to the peer OAM entity of the statistics related to this threshold crossing alarm. " REFERENCE "[802.3ah], 30.3.6.1.34" ::= { dot3OamEventConfigEntry 3 } dot3OamErrSymPeriodThresholdLo OBJECT-TYPE SYNTAX Unsigned32 UNITS "symbols" MAX-ACCESS read-write STATUS current DESCRIPTION "The two objects dot3OamErrSymPeriodThresholdHi and dot3OamErrSymPeriodThresholdLo together form an unsigned 64-bit integer representing the number of symbol errors that must occur within a given window to cause this event. This is defined as dot3OamErrSymPeriodThreshold = ((2^32) * dot3OamErrSymPeriodThresholdHi) + dot3OamErrSymPeriodThresholdLo If dot3OamErrSymPeriodThreshold symbol errors occur within a window of dot3OamErrSymPeriodWindow symbols, an Event Notification OAMPDU should be generated with an Errored Symbol Period Event TLV indicating that the threshold has been crossed in this window. The default value for dot3OamErrSymPeriodThreshold is one symbol error. If the threshold value is zero, then an Event Notification OAMPDU is sent periodically (at the end of every window). This can be used as an asynchronous notification to the peer OAM entity of the statistics related to this threshold crossing alarm. " REFERENCE "[802.3ah], 30.3.6.1.34" ::= { dot3OamEventConfigEntry 4 } dot3OamErrSymPeriodEvNotifEnable OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If true, the OAM entity should send an Event Notification OAMPDU when an Errored Symbol Period Event occurs. Squire Standards Track [Page 34]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 By default, this object should have the value true for Ethernet-like interfaces that support OAM. If the OAM layer does not support Event Notifications (as indicated via the dot3OamFunctionsSupported attribute), this value is ignored. " ::= { dot3OamEventConfigEntry 5 } dot3OamErrFramePeriodWindow OBJECT-TYPE SYNTAX Unsigned32 UNITS "frames" MAX-ACCESS read-write STATUS current DESCRIPTION "The number of frames over which the threshold is defined. The default value of the window is the number of minimum size Ethernet frames that can be received over the physical layer in one second. If dot3OamErrFramePeriodThreshold frame errors occur within a window of dot3OamErrFramePeriodWindow frames, an Event Notification OAMPDU should be generated with an Errored Frame Period Event TLV indicating that the threshold has been crossed in this window. " REFERENCE "[802.3ah], 30.3.6.1.38" ::= { dot3OamEventConfigEntry 6 } dot3OamErrFramePeriodThreshold OBJECT-TYPE SYNTAX Unsigned32 UNITS "frames" MAX-ACCESS read-write STATUS current DESCRIPTION "The number of frame errors that must occur for this event to be triggered. The default value is one frame error. If the threshold value is zero, then an Event Notification OAMPDU is sent periodically (at the end of every window). This can be used as an asynchronous notification to the peer OAM entity of the statistics related to this threshold crossing alarm. If dot3OamErrFramePeriodThreshold frame errors occur within a window of dot3OamErrFramePeriodWindow frames, an Event Notification OAMPDU should be generated with an Errored Frame Period Event TLV indicating that the threshold has been crossed in this window. " REFERENCE "[802.3ah], 30.3.6.1.38" Squire Standards Track [Page 35]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 ::= { dot3OamEventConfigEntry 7 } dot3OamErrFramePeriodEvNotifEnable OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If true, the OAM entity should send an Event Notification OAMPDU when an Errored Frame Period Event occurs. By default, this object should have the value true for Ethernet-like interfaces that support OAM. If the OAM layer does not support Event Notifications (as indicated via the dot3OamFunctionsSupported attribute), this value is ignored. " ::= { dot3OamEventConfigEntry 8 } dot3OamErrFrameWindow OBJECT-TYPE SYNTAX Unsigned32 UNITS "tenths of a second" MAX-ACCESS read-write STATUS current DESCRIPTION "The amount of time (in 100ms increments) over which the threshold is defined. The default value is 10 (1 second). If dot3OamErrFrameThreshold frame errors occur within a window of dot3OamErrFrameWindow seconds (measured in tenths of seconds), an Event Notification OAMPDU should be generated with an Errored Frame Event TLV indicating that the threshold has been crossed in this window. " REFERENCE "[802.3ah], 30.3.6.1.36" DEFVAL { 10 } ::= { dot3OamEventConfigEntry 9 } dot3OamErrFrameThreshold OBJECT-TYPE SYNTAX Unsigned32 UNITS "frames" MAX-ACCESS read-write STATUS current DESCRIPTION "The number of frame errors that must occur for this event to be triggered. The default value is one frame error. If the threshold value is zero, then an Event Notification OAMPDU is sent periodically (at the end of every window). This can be used as an asynchronous notification to the peer OAM entity of the statistics related to this threshold crossing alarm. Squire Standards Track [Page 36]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 If dot3OamErrFrameThreshold frame errors occur within a window of dot3OamErrFrameWindow (in tenths of seconds), an Event Notification OAMPDU should be generated with an Errored Frame Event TLV indicating the threshold has been crossed in this window. " REFERENCE "[802.3ah], 30.3.6.1.36" DEFVAL { 1 } ::= { dot3OamEventConfigEntry 10 } dot3OamErrFrameEvNotifEnable OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If true, the OAM entity should send an Event Notification OAMPDU when an Errored Frame Event occurs. By default, this object should have the value true for Ethernet-like interfaces that support OAM. If the OAM layer does not support Event Notifications (as indicated via the dot3OamFunctionsSupported attribute), this value is ignored. " DEFVAL { true } ::= { dot3OamEventConfigEntry 11 } dot3OamErrFrameSecsSummaryWindow OBJECT-TYPE SYNTAX Integer32 (100..9000) UNITS "tenths of a second" MAX-ACCESS read-write STATUS current DESCRIPTION "The amount of time (in 100 ms intervals) over which the threshold is defined. The default value is 100 (10 seconds). If dot3OamErrFrameSecsSummaryThreshold frame errors occur within a window of dot3OamErrFrameSecsSummaryWindow (in tenths of seconds), an Event Notification OAMPDU should be generated with an Errored Frame Seconds Summary Event TLV indicating that the threshold has been crossed in this window. " REFERENCE "[802.3ah], 30.3.6.1.40" DEFVAL { 100 } ::= { dot3OamEventConfigEntry 12 } dot3OamErrFrameSecsSummaryThreshold OBJECT-TYPE SYNTAX Integer32 (1..900) Squire Standards Track [Page 37]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 UNITS "errored frame seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The number of errored frame seconds that must occur for this event to be triggered. The default value is one errored frame second. If the threshold value is zero, then an Event Notification OAMPDU is sent periodically (at the end of every window). This can be used as an asynchronous notification to the peer OAM entity of the statistics related to this threshold crossing alarm. If dot3OamErrFrameSecsSummaryThreshold frame errors occur within a window of dot3OamErrFrameSecsSummaryWindow (in tenths of seconds), an Event Notification OAMPDU should be generated with an Errored Frame Seconds Summary Event TLV indicating that the threshold has been crossed in this window. " REFERENCE "[802.3ah], 30.3.6.1.40" DEFVAL { 1 } ::= { dot3OamEventConfigEntry 13 } dot3OamErrFrameSecsEvNotifEnable OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If true, the local OAM entity should send an Event Notification OAMPDU when an Errored Frame Seconds Event occurs. By default, this object should have the value true for Ethernet-like interfaces that support OAM. If the OAM layer does not support Event Notifications (as indicated via the dot3OamFunctionsSupported attribute), this value is ignored. " DEFVAL { true } ::= { dot3OamEventConfigEntry 14 } dot3OamDyingGaspEnable OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If true, the local OAM entity should attempt to indicate a dying gasp via the OAMPDU flags field to its peer OAM entity when a dying gasp event occurs. The exact definition of a dying gasp event is implementation dependent. If the system Squire Standards Track [Page 38]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 does not support dying gasp capability, setting this object has no effect, and reading the object should always result in 'false'. By default, this object should have the value true for Ethernet-like interfaces that support OAM. If the OAM layer does not support Event Notifications (as indicated via the dot3OamFunctionsSupported attribute), this value is ignored. " DEFVAL { true } ::= { dot3OamEventConfigEntry 15 } dot3OamCriticalEventEnable OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If true, the local OAM entity should attempt to indicate a critical event via the OAMPDU flags to its peer OAM entity when a critical event occurs. The exact definition of a critical event is implementation dependent. If the system does not support critical event capability, setting this object has no effect, and reading the object should always result in 'false'. By default, this object should have the value true for Ethernet-like interfaces that support OAM. If the OAM layer does not support Event Notifications (as indicated via the dot3OamFunctionsSupported attribute), this value is ignored. " DEFVAL { true } ::= { dot3OamEventConfigEntry 16 } -- ************************************************************** -- -- Ethernet OAM Event Log group -- dot3OamEventLogTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot3OamEventLogEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table records a history of the events that have occurred at the Ethernet OAM level. These events can include locally detected events, which may result in locally generated OAMPDUs, and remotely detected events, which are detected by the OAM peer entity and signaled to the local entity via Squire Standards Track [Page 39]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Ethernet OAM. Ethernet OAM events can be signaled by Event Notification OAMPDUs or by the flags field in any OAMPDU. This table contains both threshold crossing events and non-threshold crossing events. The parameters for the threshold window, threshold value, and actual value (dot3OamEventLogWindowXX, dot3OamEventLogThresholdXX, dot3OamEventLogValue) are only applicable to threshold crossing events, and are returned as all F's (2^32 - 1) for non-threshold crossing events. Entries in the table are automatically created when such events are detected. The size of the table is implementation dependent. When the table reaches its maximum size, older entries are automatically deleted to make room for newer entries. " ::= { dot3OamObjects 6 } dot3OamEventLogEntry OBJECT-TYPE SYNTAX Dot3OamEventLogEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the dot3OamEventLogTable. Entries are automatically created whenever Ethernet OAM events occur at the local OAM entity, and when Event Notification OAMPDUs are received at the local OAM entity (indicating that events have occurred at the peer OAM entity). The size of the table is implementation dependent, but when the table becomes full, older events are automatically deleted to make room for newer events. The table index dot3OamEventLogIndex increments for each new entry, and when the maximum value is reached, the value restarts at zero. " INDEX { ifIndex, dot3OamEventLogIndex } ::= { dot3OamEventLogTable 1 } Dot3OamEventLogEntry ::= SEQUENCE { dot3OamEventLogIndex Unsigned32, dot3OamEventLogTimestamp TimeStamp, dot3OamEventLogOui EightOTwoOui, dot3OamEventLogType Unsigned32, dot3OamEventLogLocation INTEGER, dot3OamEventLogWindowHi Unsigned32, dot3OamEventLogWindowLo Unsigned32, dot3OamEventLogThresholdHi Unsigned32, Squire Standards Track [Page 40]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 dot3OamEventLogThresholdLo Unsigned32, dot3OamEventLogValue CounterBasedGauge64, dot3OamEventLogRunningTotal CounterBasedGauge64, dot3OamEventLogEventTotal Unsigned32 } dot3OamEventLogIndex OBJECT-TYPE SYNTAX Unsigned32(1..4294967295) MAX-ACCESS not-accessible STATUS current DESCRIPTION "An arbitrary integer for identifying individual events within the event log. " ::= { dot3OamEventLogEntry 1 } dot3OamEventLogTimestamp OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time of the logged event. For locally generated events, the time of the event can be accurately retrieved from sysUpTime. For remotely generated events, the time of the event is indicated by the reception of the Event Notification OAMPDU indicating that the event occurred on the peer. A system may attempt to adjust the timestamp value to more accurately reflect the time of the event at the peer OAM entity by using other information, such as that found in the timestamp found of the Event Notification TLVs, which provides an indication of the relative time between events at the peer entity. " ::= { dot3OamEventLogEntry 2 } dot3OamEventLogOui OBJECT-TYPE SYNTAX EightOTwoOui MAX-ACCESS read-only STATUS current DESCRIPTION "The OUI of the entity defining the object type. All IEEE 802.3 defined events (as appearing in [802.3ah] except for the Organizationally Unique Event TLVs) use the IEEE 802.3 OUI of 0x0180C2. Organizations defining their own Event Notification TLVs include their OUI in the Event Notification TLV that gets reflected here. " ::= { dot3OamEventLogEntry 3 } dot3OamEventLogType OBJECT-TYPE SYNTAX Unsigned32 Squire Standards Track [Page 41]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 MAX-ACCESS read-only STATUS current DESCRIPTION "The type of event that generated this entry in the event log. When the OUI is the IEEE 802.3 OUI of 0x0180C2, the following event types are defined: erroredSymbolEvent(1), erroredFramePeriodEvent(2), erroredFrameEvent(3), erroredFrameSecondsEvent(4), linkFault(256), dyingGaspEvent(257), criticalLinkEvent(258) The first four are considered threshold crossing events, as they are generated when a metric exceeds a given value within a specified window. The other three are not threshold crossing events. When the OUI is not 71874 (0x0180C2 in hex), then some other organization has defined the event space. If event subtyping is known to the implementation, it may be reflected here. Otherwise, this value should return all F's (2^32 - 1). " REFERENCE "[802.3ah], 30.3.6.1.10 and 57.5.3." ::= { dot3OamEventLogEntry 4 } dot3OamEventLogLocation OBJECT-TYPE SYNTAX INTEGER { local(1), remote(2) } MAX-ACCESS read-only STATUS current DESCRIPTION "Whether this event occurred locally (local(1)), or was received from the OAM peer via Ethernet OAM (remote(2)). " ::= { dot3OamEventLogEntry 5 } dot3OamEventLogWindowHi OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "If the event represents a threshold crossing event, the two objects dot3OamEventWindowHi and dot3OamEventWindowLo, form an unsigned 64-bit integer yielding the window over which the value was measured for the threshold crossing event (for example, 5, when 11 occurrences happened in 5 seconds while the threshold was 10). The two objects are combined as: Squire Standards Track [Page 42]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 dot3OamEventLogWindow = ((2^32) * dot3OamEventLogWindowHi) + dot3OamEventLogWindowLo Otherwise, this value is returned as all F's (2^32 - 1) and adds no useful information. " REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 6 } dot3OamEventLogWindowLo OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "If the event represents a threshold crossing event, the two objects dot3OamEventWindowHi and dot3OamEventWindowLo form an unsigned 64-bit integer yielding the window over which the value was measured for the threshold crossing event (for example, 5, when 11 occurrences happened in 5 seconds while the threshold was 10). The two objects are combined as: dot3OamEventLogWindow = ((2^32) * dot3OamEventLogWindowHi) + dot3OamEventLogWindowLo Otherwise, this value is returned as all F's (2^32 - 1) and adds no useful information. " REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 7 } dot3OamEventLogThresholdHi OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "If the event represents a threshold crossing event, the two objects dot3OamEventThresholdHi and dot3OamEventThresholdLo form an unsigned 64-bit integer yielding the value that was crossed for the threshold crossing event (for example, 10, when 11 occurrences happened in 5 seconds while the threshold was 10). The two objects are combined as: dot3OamEventLogThreshold = ((2^32) * dot3OamEventLogThresholdHi) + dot3OamEventLogThresholdLo Otherwise, this value is returned as all F's (2^32 -1) and adds no useful information. " Squire Standards Track [Page 43]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 8 } dot3OamEventLogThresholdLo OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "If the event represents a threshold crossing event, the two objects dot3OamEventThresholdHi and dot3OamEventThresholdLo form an unsigned 64-bit integer yielding the value that was crossed for the threshold crossing event (for example, 10, when 11 occurrences happened in 5 seconds while the threshold was 10). The two objects are combined as: dot3OamEventLogThreshold = ((2^32) * dot3OamEventLogThresholdHi) + dot3OamEventLogThresholdLo Otherwise, this value is returned as all F's (2^32 - 1) and adds no useful information. " REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 9 } dot3OamEventLogValue OBJECT-TYPE SYNTAX CounterBasedGauge64 MAX-ACCESS read-only STATUS current DESCRIPTION "If the event represents a threshold crossing event, this value indicates the value of the parameter within the given window that generated this event (for example, 11, when 11 occurrences happened in 5 seconds while the threshold was 10). Otherwise, this value is returned as all F's (2^64 - 1) and adds no useful information. " REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 10 } dot3OamEventLogRunningTotal OBJECT-TYPE SYNTAX CounterBasedGauge64 MAX-ACCESS read-only STATUS current DESCRIPTION "Each Event Notification TLV contains a running total of the number of times an event has occurred, as well as the number of times an Event Notification for the event has been Squire Standards Track [Page 44]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 transmitted. For non-threshold crossing events, the number of events (dot3OamLogRunningTotal) and the number of resultant Event Notifications (dot3OamLogEventTotal) should be identical. For threshold crossing events, since multiple occurrences may be required to cross the threshold, these values are likely different. This value represents the total number of times this event has happened since the last reset (for example, 3253, when 3253 symbol errors have occurred since the last reset, which has resulted in 51 symbol error threshold crossing events since the last reset). " REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 11 } dot3OamEventLogEventTotal OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "Each Event Notification TLV contains a running total of the number of times an event has occurred, as well as the number of times an Event Notification for the event has been transmitted. For non-threshold crossing events, the number of events (dot3OamLogRunningTotal) and the number of resultant Event Notifications (dot3OamLogEventTotal) should be identical. For threshold crossing events, since multiple occurrences may be required to cross the threshold, these values are likely different. This value represents the total number of times one or more of these occurrences have resulted in an Event Notification (for example, 51 when 3253 symbol errors have occurred since the last reset, which has resulted in 51 symbol error threshold crossing events since the last reset). " REFERENCE "[802.3ah], 30.3.6.1.37 and 57.5.3.2." ::= { dot3OamEventLogEntry 12 } -- *************************************************************** -- -- Ethernet OAM Notifications -- dot3OamThresholdEvent NOTIFICATION-TYPE OBJECTS { dot3OamEventLogTimestamp, dot3OamEventLogOui, Squire Standards Track [Page 45]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 dot3OamEventLogType, dot3OamEventLogLocation, dot3OamEventLogWindowHi, dot3OamEventLogWindowLo, dot3OamEventLogThresholdHi, dot3OamEventLogThresholdLo, dot3OamEventLogValue, dot3OamEventLogRunningTotal, dot3OamEventLogEventTotal } STATUS current DESCRIPTION "A dot3OamThresholdEvent notification is sent when a local or remote threshold crossing event is detected. A local threshold crossing event is detected by the local entity, while a remote threshold crossing event is detected by the reception of an Ethernet OAM Event Notification OAMPDU that indicates a threshold event. This notification should not be sent more than once per second. The OAM entity can be derived from extracting the ifIndex from the variable bindings. The objects in the notification correspond to the values in a row instance in the dot3OamEventLogTable. The management entity should periodically check dot3OamEventLogTable to detect any missed events." ::= { dot3OamNotifications 1 } dot3OamNonThresholdEvent NOTIFICATION-TYPE OBJECTS { dot3OamEventLogTimestamp, dot3OamEventLogOui, dot3OamEventLogType, dot3OamEventLogLocation, dot3OamEventLogEventTotal } STATUS current DESCRIPTION "A dot3OamNonThresholdEvent notification is sent when a local or remote non-threshold crossing event is detected. A local event is detected by the local entity, while a remote event is detected by the reception of an Ethernet OAM Event Notification OAMPDU that indicates a non-threshold crossing event. This notification should not be sent more than once per Squire Standards Track [Page 46]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 second. The OAM entity can be derived from extracting the ifIndex from the variable bindings. The objects in the notification correspond to the values in a row instance of the dot3OamEventLogTable. The management entity should periodically check dot3OamEventLogTable to detect any missed events." ::= { dot3OamNotifications 2 } -- *************************************************************** -- -- Ethernet OAM Compliance group -- dot3OamGroups OBJECT IDENTIFIER ::= { dot3OamConformance 1 } dot3OamCompliances OBJECT IDENTIFIER ::= { dot3OamConformance 2 } -- Compliance statements dot3OamCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for managed entities supporting OAM on Ethernet-like interfaces. " MODULE -- this module MANDATORY-GROUPS { dot3OamControlGroup, dot3OamPeerGroup, dot3OamStatsBaseGroup } GROUP dot3OamLoopbackGroup DESCRIPTION "This group is mandatory for all IEEE 802.3 OA implementations that support loopback functionality. " GROUP dot3OamErrSymbolPeriodEventGroup DESCRIPTION "This group is mandatory for all IEEE 802.3 OA implementations that support event functionality. " GROUP dot3OamErrFramePeriodEventGroup DESCRIPTION "This group is mandatory for all IEEE 802.3 OA implementations that support event functionality. " GROUP dot3OamErrFrameEventGroup Squire Standards Track [Page 47]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 DESCRIPTION "This group is mandatory for all IEEE 802.3 OA implementations that support event functionality. " GROUP dot3OamErrFrameSecsSummaryEventGroup DESCRIPTION "This group is mandatory for all IEEE 802.3 OA implementations that support event functionality. " GROUP dot3OamFlagEventGroup DESCRIPTION "This group is optional for all IEEE 802.3 OA implementations. The ability to send critical events or dying gasp events is not required in any system." GROUP dot3OamEventLogGroup DESCRIPTION "This group is optional for all IEEE 802.3 OA implementations. Entries in this table are dependent on what event functionality is supported in the local OA implementation. At least one type of event must be supported for entries to appear in this table. " GROUP dot3OamNotificationGroup DESCRIPTION "This group is optional for all IEEE 802.3 OA implementations. Since the information in the notifications is dependent on the dot3OamEventLogTable, that table must be implemented for notifications. " ::= { dot3OamCompliances 1} dot3OamControlGroup OBJECT-GROUP OBJECTS { dot3OamAdminState, dot3OamOperStatus, dot3OamMode, dot3OamMaxOamPduSize, dot3OamConfigRevision, dot3OamFunctionsSupported } STATUS current DESCRIPTION "A collection of objects providing the abilities, configuration, and status of an Ethernet OAM entity. " ::= { dot3OamGroups 1 } dot3OamPeerGroup OBJECT-GROUP OBJECTS { dot3OamPeerMacAddress, Squire Standards Track [Page 48]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 dot3OamPeerVendorOui, dot3OamPeerVendorInfo, dot3OamPeerMode, dot3OamPeerFunctionsSupported, dot3OamPeerMaxOamPduSize, dot3OamPeerConfigRevision } STATUS current DESCRIPTION "A collection of objects providing the abilities, configuration, and status of a peer Ethernet OAM entity. " ::= { dot3OamGroups 2 } dot3OamStatsBaseGroup OBJECT-GROUP OBJECTS { dot3OamInformationTx, dot3OamInformationRx, dot3OamUniqueEventNotificationTx, dot3OamUniqueEventNotificationRx, dot3OamDuplicateEventNotificationTx, dot3OamDuplicateEventNotificationRx, dot3OamLoopbackControlTx, dot3OamLoopbackControlRx, dot3OamVariableRequestTx, dot3OamVariableRequestRx, dot3OamVariableResponseTx, dot3OamVariableResponseRx, dot3OamOrgSpecificTx, dot3OamOrgSpecificRx, dot3OamUnsupportedCodesTx, dot3OamUnsupportedCodesRx, dot3OamFramesLostDueToOam } STATUS current DESCRIPTION "A collection of objects providing the statistics for the number of various transmit and receive events for OAM on an Ethernet-like interface. Note that all of these counters must be supported even if the related function (as described in dot3OamFunctionsSupported) is not supported. " ::= { dot3OamGroups 3 } dot3OamLoopbackGroup OBJECT-GROUP OBJECTS { dot3OamLoopbackStatus, dot3OamLoopbackIgnoreRx } STATUS current DESCRIPTION "A collection of objects for controlling the OAM remote Squire Standards Track [Page 49]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 loopback function. " ::= { dot3OamGroups 4 } dot3OamErrSymbolPeriodEventGroup OBJECT-GROUP OBJECTS { dot3OamErrSymPeriodWindowHi, dot3OamErrSymPeriodWindowLo, dot3OamErrSymPeriodThresholdHi, dot3OamErrSymPeriodThresholdLo, dot3OamErrSymPeriodEvNotifEnable } STATUS current DESCRIPTION "A collection of objects for configuring the thresholds for an Errored Symbol Period Event. Each [802.3ah] defined Event Notification TLV has its own conformance group because each event can be implemented independently of any other. " ::= { dot3OamGroups 5 } dot3OamErrFramePeriodEventGroup OBJECT-GROUP OBJECTS { dot3OamErrFramePeriodWindow, dot3OamErrFramePeriodThreshold, dot3OamErrFramePeriodEvNotifEnable } STATUS current DESCRIPTION "A collection of objects for configuring the thresholds for an Errored Frame Period Event. Each [802.3ah] defined Event Notification TLV has its own conformance group because each event can be implemented independently of any other. " ::= { dot3OamGroups 6 } dot3OamErrFrameEventGroup OBJECT-GROUP OBJECTS { dot3OamErrFrameWindow, dot3OamErrFrameThreshold, dot3OamErrFrameEvNotifEnable } STATUS current DESCRIPTION "A collection of objects for configuring the thresholds for an Errored Frame Event. Each [802.3ah] defined Event Notification TLV has its own conformance group because each event can be implemented independently of any other. " Squire Standards Track [Page 50]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 ::= { dot3OamGroups 7 } dot3OamErrFrameSecsSummaryEventGroup OBJECT-GROUP OBJECTS { dot3OamErrFrameSecsSummaryWindow, dot3OamErrFrameSecsSummaryThreshold, dot3OamErrFrameSecsEvNotifEnable } STATUS current DESCRIPTION "A collection of objects for configuring the thresholds for an Errored Frame Seconds Summary Event. Each [802.3ah] defined Event Notification TLV has its own conformance group because each event can be implemented independently of any other. " ::= { dot3OamGroups 8 } dot3OamFlagEventGroup OBJECT-GROUP OBJECTS { dot3OamDyingGaspEnable, dot3OamCriticalEventEnable } STATUS current DESCRIPTION "A collection of objects for configuring the sending OAMPDUs with the critical event flag or dying gasp flag enabled. " ::= { dot3OamGroups 9 } dot3OamEventLogGroup OBJECT-GROUP OBJECTS { dot3OamEventLogTimestamp, dot3OamEventLogOui, dot3OamEventLogType, dot3OamEventLogLocation, dot3OamEventLogWindowHi, dot3OamEventLogWindowLo, dot3OamEventLogThresholdHi, dot3OamEventLogThresholdLo, dot3OamEventLogValue, dot3OamEventLogRunningTotal, dot3OamEventLogEventTotal } STATUS current DESCRIPTION "A collection of objects for configuring the thresholds for an Errored Frame Seconds Summary Event and maintaining the event information. " ::= { dot3OamGroups 10 } dot3OamNotificationGroup NOTIFICATION-GROUP Squire Standards Track [Page 51]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 NOTIFICATIONS { dot3OamThresholdEvent, dot3OamNonThresholdEvent } STATUS current DESCRIPTION "A collection of notifications used by Ethernet OAM to signal to a management entity that local or remote events have occurred on a specified Ethernet link. " ::= { dot3OamGroups 11 } END 7. Security Considerations The readable objects in this module can provide information about network traffic, and therefore may be considered sensitive. In particular, OAM provides mechanisms for reading the IEEE 802.3 Clause 30 MIB attributes from a link partner via a specialized layer two protocol. Unlike SNMP, IEEE P802.3ah OAM does not include encryption or authentication mechanisms. It should be used in environments where either this interface information is not considered sensitive, or where the facility terminations are protected. By default, OAM is disabled on Ethernet-like interfaces and is therefore not a risk. IEEE 802.3ah OAM is designed to support deployment in access and enterprise networks. In access networks, one end of a link is the CO-side, and the other is the CPE-side, and the facilities are often protected in wiring cages or closets. In such deployments, it is often the case that the CO-side is protected from access from the CPE-side. Within IEEE P802.3ah OAM, this protection from remote access is accomplished by configuring the CPE-side in passive mode using the dot3OamMode attribute. This prevents the CPE from accessing functions and information at the CO-side of the connection. In enterprise networks, read-only interface information is often considered non-sensitive. The frequency of OAM PDUs on an Ethernet interface does not adversely affect data traffic, as OAM is a slow protocol with very limited bandwidth potential, and it is not required for normal link operation. And although there are a number of objects in this module with read-write or read-create MAX-ACCESS, they have limited effects on user data. The loopback capability of OAM can have potentially disruptive effects in that the when enabling remote loopback, the remote station automatically transmits all received traffic back to the local station except for OAM traffic. This completely disrupts all higher Squire Standards Track [Page 52]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 layer protocols such as bridging, IP, and SNMP. Therefore an attribute (dot3OamLoopbackIgnoreRx) was introduced to control whether the local station processes or ignores received loopback commands. The administrative state and mode are also read-write objects. Disabling OAM can interrupt management activities between peer devices, potentially causing serious problems. Setting the dot3OamMode to an undesired value can allow access to Ethernet monitoring, events, and functions that may not be acceptable in a particular deployment scenario. In addition to loopback functionality, Ethernet interface statistics and events can be accessed via the OAM protocol, which may not be desired in some circumstances. OAM event configuration also contains read-write objects. These objects control whether events are sent, and at what thresholds. Note that the frequency of event communication is limited by the frequency limits of Slow Protocols on Ethernet interfaces. Also, the information available via OAM events is also available via OA Variable Requests. Access to this information via either OAM events or Variable Requests is controlled by the dot3OamAdminState and dot3OamMode objects. As mentioned previously, inadequate protection of these variables can result in access to link information and functions. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module. It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy). Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. Squire Standards Track [Page 53]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 8. IANA Considerations The Ethernet OAM MIB requires the allocation of a single object identifier for its MODULE-IDENTITY under the MIB-2 tree. The MIB module in this document uses the following IANA-assigned OBJECT IDENTIFIER values recorded in the SMI Numbers registry: Descriptor OBJECT IDENTIFIER ---------- ----------------- dot3OamMIB { mib-2 158 } 9. References 9.1. Normative References [802.3ah] Institute of Electrical and Electronic Engineers, IEEE Std 802.3ah-2004, "Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications - Amendment: Media Access Control Parameters, Physical Layers and Management Parameters for Subscriber Access Networks", October 2004. [802.3-2002] Institute of Electrical and Electronic Engineers, IEEE Std 802.3-2003, "IEEE Standard for Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications - Draft amendment to - Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications - Media Access Control Parameters, Physical Layers and Management Parameters", March 2002. Squire Standards Track [Page 54]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 [802.3-2005] Institute of Electrical and Electronic Engineers, IEEE Std 802.3-2005, "IEEE Standard for Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications - Draft amendment to - Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications - Media Access Control Parameters, Physical Layers and Management Parameters", December 2005. [802-2001] Institute of Electrical and Electronic Engineers, IEEE Std 802-2001, "Standard for Local and Metropolitan Area Networks: Architecture and Overview", March 2002. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC2856] Bierman, A., McCloghrie, K., and R. Presuhn, "Textual Conventions for Additional High Capacity Data Types", RFC 2856, June 2000. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. 9.2. Informative References [802.3ah-copper] Beili, Ed, "Ethernet in the First Mile Copper (EFMCu) Interfaces MIB", Work in Progress, February 2007. Squire Standards Track [Page 55]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 [802.3ah-epon] Khermosh, L., "Managed Objects of Ethernet Passive Optical Networks (EPON)", RFC 4837, June 2007. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet-Standard Management Framework", RFC 3410, December 2002. [RFC3635] Flick, J., "Definitions of Managed Objects for the Ethernet-like Interface Types", RFC 3635, September 2003. 10. Acknowledgments The author is grateful to all of the participants in the IEEE 802.3ah EFM (Ethernet in the First Mile) taskforce. In particular, the strong leadership and dedication of the following individuals is noted: Kevin Daines (Editor, IEEE 802.3ah OAM clauses) Ben Brown (Editor, IEEE 802.3ah Logic clauses) David Law (Editor, IEEE 802.3ah Management clauses) Scott Simon (Editor, IEEE 802.3ah Clause 45) Howard Frazier (Chair, IEEE 802.3ah) Hugh Barass (Vice-Chair, IEEE 802.3ah) Wael Diab (Editor, IEEE 802.3ah) Additionally, certain devoted attendees and contributors to the IEEE 802.3ah OAM sub-taskforce deserve recognition. Although there were many contributors, the following individuals contributed heavily over a long period of time. Brian Arnold Brad Booth Al Braga Floyd Gerhardt Bob Grow Eric Lynskey David Martin John Messenger Dan Romascanu (Ex-Chair, IETF HUBMIB WG) Jonathan Thatcher Geoff Thompson Squire Standards Track [Page 56]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Author's Address Matt Squire Hatteras Networks 529 Davis Drive Durham, NC 27713 EMail: msquire@hatterasnetworks.com Squire Standards Track [Page 57]
RFC 4878 OAM Functions on Ethernet-Like Interfaces June 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. Squire Standards Track [Page 58]

   

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