Cisco Systems A9014CFD manual Understanding Ethernet CFM, Configuring Ethernet CFM, 10-2

Chapter 10 Configuring Ethernet OAM

•Displaying Ethernet OAM Protocol Information, page 10-45

•Understanding E-LMI, page 10-48

•Configuring E-LMI, page 10-49

•Displaying E-LMI Information, page 10-51

•Configuring Ethernet Loopback, page 10-51

•Configuring Y.1564 to Generate Ethernet Traffic, page 10-56

Understanding Ethernet CFM

Ethernet CFM is an end-to-end per-service-instance (per VLAN) Ethernet layer OAM protocol that includes proactive connectivity monitoring, fault verification, and fault isolation. End-to-end can be provider-edge-to-provider-edge (PE-to-PE) device. Ethernet CFM, as specified by IEEE 802.1ag, is the standard for Layer 2 ping, Layer 2 traceroute, and end-to-end connectivity check of the Ethernet network.

For more information about ethernet CFM, see Ethernet Connectivity Fault Management.

IP SLA Support for CFM

The router supports CFM with IP Service Level Agreements (SLA), which provides the ability to gather Ethernet layer network performance metrics. Available statistical measurements for the IP SLA CFM operation include round-trip time, jitter (interpacket delay variance), and packet loss. You can schedule multiple IP SLA operations and use Simple Network Management Protocol (SNMP) trap notifications and syslog messages for proactive threshold violation monitoring.

IP SLA integration with CFM gathers Ethernet layer statistical measurements by sending and receiving Ethernet data frames between CFM MEPs. Performance is measured between the source MEP and the destination MEP. Unlike other IP SLA operations that provide performance metrics for only the IP layer, IP SLA with CFM provides performance metrics for Layer 2.

You can manually configure individual Ethernet ping or jitter operations. You can also configure an IP SLA automatic Ethernet operation that queries the CFM database for all MEPs in a given maintenance domain and VLAN. The operation then automatically creates individual Ethernet ping or jitter operations based on the discovered MEPs.

Because IP SLA is a Cisco proprietary feature, interoperability between CFM draft 1 and CFM 802.1ag is handled automatically by the router.

For more information about IP SLA operation with CFM, see the IP SLAs for Metro-Ethernetfeature module at this URL:

http://www.cisco.com/en/US/docs/ios/12_2sr/12_2srb/feature/guide/sr_meth.html

Configuring Ethernet CFM

Configuring Ethernet CFM requires configuring the CFM domain. You can optionally configure and enable other CFM features such as crosschecking, remote MEP, port MEPs, SNMP traps, and fault alarms. Note that some of the configuration commands and procedures differ from those used in CFM draft 1.

This section contains the following topics:

•Default Ethernet CFM Configuration, page 10-3

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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