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.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support.
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Prerequisites for Configuring Ethernet CFM in a Service Provider
Network
Business Requirements
•
Network topology and network administration have been evaluated.
•
Business and service policies have been established.
Restrictions for Configuring Ethernet CFM in a Service Provider
Network
•
CFM loopback messages will not be confined within a maintenance domain according to their maintenance
level. The impact of not having CFM loopback messages confined to their maintenance levels occurs
at these levels:
• Architecture—CFM layering is violated for loopback messages.
• Deployment—A user may potentially misconfigure a network and have loopback messages succeed.
• Security—A malicious device that recognizes devices’ MAC addresses and levels may potentially
explore a network topology that should be transparent.
•
CFM is not fully supported on a Multiprotocol Label Switching (MPLS) provider edge (PE) device.
There is no interaction between CFM and an Ethernet over MPLS (EoMPLS) pseudowire.
•
CFM configuration is not supported on an EtherChannel in FastEthernet Channel (FEC) mode.
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
124
Configuring Ethernet Connectivity Fault Management in a Service Provider Network
Finding Feature Information
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