Ethernet OAM Overview Configuring Ethernet OAM
page 8-4 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
CFM Monitoring Domains
Ethernet OAM Connectivity Fault Management consists of four types of messages that help in monitoring
and debugging Ethernet networks. These messages are described below:
• Continuity Check Messages (CCMs)—These are multicast messages exchanged periodically between
MEPs. They allow MEPs to detect loss of service connectivity amongst themselves and discover other
MEPs within a domain. These messages also enable MIPs to discover MEPs.
• Linktrace Messages(LTMs)—These messages are transmitted by a MEP to trace the path to a destina-
tion MEP. They are requested by an administrator.
• Loopback Messages (LBMs)—These messages are transmitted by a MEP to a specified MIP or MEP.
They are requested by an administrator.
• Alarm Indication Signal (AIS) Messages—These messages send alerts to other devices in the network
to notify a fault in the network.
Note. AIS messages are not supported in this release.
Customer
Network
Customer
Network
Access Network Access Network
Core Network
Operator
Domain
Customer
Domain
Provider
Domain
Maintenance End Point
Maintenance Intermediate Point
Operator
Domain
Operator
Domain
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