Configuring Ethernet OAM Ethernet OAM Overview
OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 15-5
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
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Access Network Access Network
Core Network
Operator
Domain
Customer
Domain
Provider
Domain
Maintenance End Point
Maintenance Intermediate Point
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