Eth-Cfm (802.1Ag And Y.1731) - Alcatel-Lucent 7705 Service Manual

ETH-CFM (802.1ag and Y.1731)

ETH-CFM (802.1ag and Y.1731)
Ethernet Connectivity Fault Management (ETH-CFM) is defined in two complementary
standards: IEEE 802.1ag (dot1ag) and ITU-T Y.1731. Both standards specify protocols,
procedures, and managed objects in support of transport fault management, including
discovery and verification of the path, and detection and isolation of a connectivity fault for
each Ethernet service instance.
Dot1ag and Y.1731 provide fault management (FM) functions for loopback, linktrace, and
connectivity checks, as well as Up and Down MEP support for Ethernet SAPs and Down
MEP support for spoke SDPs (dot1ag only).
Y.1731 fault management (Y.1731 FM) extends dot1ag CFM by providing functions for
alarm indication signal (AIS) and ETH-Test testing. Furthermore, Y.1731 provides
performance management (Y.1731 PM) functions for delay and loss measurements. For
more information on Y.1731 PM, refer to the "ITU-T Y.1731 Performance Monitoring
(PM)" section in the 7705 SAR OS OAM and Diagnostics Guide.
For information on running Ethernet OAM tests, refer to the "ETH-CFM (802.1ag and
Y.1731)" section in the 7705 SAR OS OAM and Diagnostics Guide.
CFM uses Ethernet frames that are distinguished by their Ethertype value and special
Ethernet multicast address. For more information on the Ethernet frame, and the Ethertype
and Ethernet multicast address values, see
Using CFM, interoperability can be achieved between different vendor equipment in the
service provider network, up to and including customer premises bridges.
Note: In the 7705 SAR CLI command hierarchy, commands for 802.1ag and Y.1731 are
found under the eth-cfm context that appears at the following levels:
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global (config>eth-cfm)
Epipe service (config>service>epipe>sap>eth-cfm)
show (show>eth-cfm)
oam (oam eth-cfm)
ETH-CFM Frame Format.
7705 SAR OS Services Guide