Carrier Ethernet Configuration Guide, Cisco IOS Release 15S
IEEE-Compliant CFM MIB
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IEEE-Compliant CFM MIB

IEEE-Compliant CFM MIB

The IEEE-compliant CFM MIB (IEEE CFM MIB) provides MIB support for IEEE 802.1ag-compliant connectivity fault management (IEEE CFM) services. The IEEE CFM MIB can be used as a tool to trace paths, verify and manage connectivity, and detect faults in a network.

This document describes the IEEE CFM MIB and the IEEE CFM services that it supports.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for the IEEE-Compliant CFM MIB

  • The CFM 8.1ag module must be present in the software image.

Restrictions for the IEEE-Compliant CFM MIB

  • The IEEE-compliant CFM MIB does not support SET operations.
  • The IEEE-compliant CFM MIB does not support the capability to create rows.
  • Some devices do not support the CFM MIB on bridge domains and IETF. See to the documentation for the device.

Information About the IEEE-Compliant CFM MIB

IEEE CFM MIB Implementation

The IEEE CFM MIB is compliant with the IEEE 802.1ap standard, which defines the IEEE CFM MIB as two modules: IEEE8021-CFM-MIB and IEEE8021-CFM-V2-MIB. The IEEE CFM MIB feature implements both modules.

The IEEE 802.1ag standard provides capabilities for detecting and isolating connectivity failures in a network. Network operators need network management tools to trace paths, verify and manage connectivity, and detect faults in a network. The IEEE CFM MIB has tables and objects that can be created, written, and read by network administrators. Additionally, an administrator may provide limited access to another provider, who can become the administrator of that table or object. Some tables and objects (for example, the CFM stack managed object or the default maintenance domain level object) can be used only by the owner of the network or bridge.

IEEE CFM Services Supported by the IEEE CFM MIB

The table below shows the IEEE CFM services that the IEEE CFM MIB supports and the MIB modules associated with the service.

Table 1 IEEE CFM Services Supported by the IEEE-compliant CFM MIB

CFM Service

Required IF-MIB Support

Associated Service MIB Modules

CFMoVLANs

IF-MIB support for interfaces

--

CFMoEVC with BD

IF-MIB support for Ethernet flow points (EFPs) forwarding defined as bridge domain

  • CISCO-EVC-MIB
  • CISCO-BRIDGE-DOMAIN-MIB

CFMoEVC with XC

IF-MIB support for EFPs forwarding defined as cross connect

  • CISCO-EVC-MIB
  • CISCO-IETF-PW-MIB

Tables in the IEEE CFM MIB

Eleven tables and one set of alarms are in the IEEE CFM MIB and are listed by module in the following sections:

IEEE8021-CFM-MIB

Six tables and the set of alarms are in the IEEE8021-CFM-MIB module. The tables are:

  • Linktrace Reply Table (dot1agCfmLtrTable)--Extends the maintenance endpoint (MEP) table and contains a list of linktrace replies received by a specific MEP in response to a linktrace message.
  • Maintenance Association (MA) Network Table (dot1agCfmMaNetTable)--Lists maintenance associations; each row in the table represents a maintenance association. This part of the MA table is constant across all bridges in a maintenance domain or across all components of a single bridge.
  • Maintenance Domain Table (dot1agCfmMdTable)--Lists maintenance domains; each row in the table represents a different maintenance domain.
  • MAMEP Table (dot1agCfmMaMepListTable)--Lists a table entry for known MEPs for an MA.
  • MEP Database Table (dot1agCfmMepDbTable)--Extends the MEP table and is a database of information received about other MEPs in the maintenance domain.
  • MEP Table (dot1agCfmMepTable)--Lists MEPs; each row in the table represents a different MEP.

A fault alarm (notification or trap) is sent to the management entity when a defect condition is detected. The object identifier (OID) of the MEP that detected the defect condition is sent as part of the alarm.

Fault alarms are assigned priorities, which perform the following functions:

  • Define that a period of time should elapse with the defect condition present before a fault alarm is sent. The default is 2.5 seconds.
  • Define that alarms are not sent after a time period has elapsed in which no alarms occurred. The default is 10 seconds.
  • Define an alarm priority from 5 (highest) to 1 (lowest) that controls which failures trigger fault alarms.
Defect Descriptions and Associated Fault Alarm Priorities

The table below shows the defects listed in order of their associated priorities.

Table 2 Defect Descriptions and Associated Fault Alarm Priorities

Defect

Priority

Description

DefXconCCM

5 (highest)

One or more cross-connect continuity check messages (CCMs) has been received, and 3.5 times at least one of those CCMs’ transmission interval has not yet expired: CrossConnect Error.

DefErrorCCM

4

One or more invalid CCMs has been received, and 3.5 times the CCMs’ transmission interval has not yet expired: CrossCheck Error--Unknown MEP, Config Error, Loop Error.

DefRemoteCCM

3

At least one of the remote MEP state machines is not receiving valid CCMs from its remote MEP: CrossCheck Error--MEP Missing.

DefMACstatus

2

One or more of the remote MEPs is reporting a failure in its Port Status Type-Length-Value (TLV) or Interface Status TLV: MEP Down.

DefRDICCM

1 (lowest)

At least one of the Remote MEP state machines is receiving valid CCMs from its remote MEP that has the Remote Defect Indication (RDI) bit set.

IEEE8021-CFM-V2-MIB

The following five tables are in the IEEE8021-CFM-V2-MIB module:

  • CFM Configuration Error List Table (ieee8021CfmConfigErrorListTable)--Provides lists of interfaces and VIDs that are incorrectly configured.
  • CFM Default MD Level Table (ieee8021CfmDefaultMdTable)--For each bridge component, controls MIP Half Function (MHF) creation for VIDs that are not attached to a specific maintenance association managed object and Sender ID TLV transmission by those MHFs.
  • CFM Maintenance Association Component Table (ieee8021CfmMaCompTable)--Lists maintenance associations. Each row in the table represents a maintenance association. This part of the MA table is variable across bridges in a maintenance domain or across components of a single bridge.
  • CFM Stack Table (ieee8021CfmStackTable)--Allows retrieval of information about maintenance points configured on any interface. There is one stack table per bridge.
  • CFM VLAN Table (ieee8021CfmVlanTable)--Defines the association of primary VIDs with VLANs. Each VID that is not the primary VID and each VID that belongs to a VLAN associated with more than one VID has an entry in this table. VLANs associated with a single VID should not have an entry in this table.

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Master Command List, All Releases

Cisco IOS Carrier Ethernet commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Carrier Ethernet Command Reference

Configuring Carrier Ethernet

Carrier Ethernet Configuration Guide

Standards

Standard

Title

IEEE 802.1ag-2007

IEEE Standard for Local and metropolitan area networks--Virtual Bridged Local Area Networks

IEEE 802.1ap

802.1ap - Management Information Base (MIB) definitions for VLAN Bridges

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

Feature Information for the IEEE-Compliant CFM MIB

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Table 3 Feature Information for the IEEE-Compliant CFM MIB

Feature Name

Releases

Feature Information

IEEE-Compliant CFM MIB

Cisco IOS XE Release 3.8S

The IEEE-compliant CFM MIB provides MIB support for IEEE CFM services. The IEEE-compliant CFM MIB can be used as a tool to trace paths, verify and manage connectivity, and detect faults in a network.

The following commands were modified: ethernet cfm alarm, snmp-server enable traps ethernet cfm alarm, snmp-server host.