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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 39 Configuring Ethernet OAM, CFM, and E-LMI Configuring Ethernet CFM

IP SLAs Support for CFM

Starting with Cisco IOS Release 12.2(40)SE, the switch supports CFM with IP Service Level
Agreements (SLAs), which provides the ability to gather Ethernet layer network performance metrics.
Available statistical measurements for the IP SLAs CFM operation include round-trip time, jitter
(interpacket delay variance), and packet loss. You can schedule multiple IP SLAs operations and use
Simple Network Management Protocol (SNMP) trap notifications and syslog messages for proactive
threshold violation monitoring.
For more information about IP SLAs, see Chapter 37, “Configuring Cisco IOS IP SLAs Operations.”
IP SLAs 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 SLAs operations that provide performance metrics for only the IP
layer, IP SLAs with CFM provides performance metrics for Layer 2.
You can manually configure individual Ethernet ping or jitter operations. You can also configure an IP
SLAs 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.
For more information about IP SLAs operation with CFM, see the IP SLAs for Metro-Ethernet feature
module at this URL:
http://www.cisco.com/en/US/products/ps6922/products_feature_guide09186a00807d72f5.html
Configuring Ethernet CFM
Configuring Ethernet CFM requires preparing the network and configuring services. You can optionally
configure and enable crosschecking. These sections are included
• Default Ethernet CFM Configuration, page 39-5
• Ethernet CFM Configuration Guidelines, page 39-6
• Preparing the Ethernet CFM Network, page 39-6
• Configuring Ethernet CFM Service, page 39-7
• Configuring Ethernet CFM Crosscheck, page 39-8
• Configuring IP SLAs CFM Operation, page 39-9

Default Ethernet CFM Configuration

CFM is globally disabled.
CFM is enabled on all interfaces. A port can be configured as a flow point (MIP/MEP), a transparent
port, or disabled (CFM disabled). By default, ports are transparent ports until configured as MEP, MIP,
or disabled.
There are no MEPs or MIPs configured.