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IES-5000/5005/6000 Support Notes
55
LBM—Loop Back Message
LTM—Link Trace Message
• MIP--Maintenance Intermediate Point
o An MIP port forwards the CCMs, LBMs, and LTMs and replies the LBMs and
LTMs by sending LBRs and LTRs.
An MIP port forwards the CCMs, LBMs, and LTMs and replies the LBMs and LTMs by sending
LBRs and LTRs.
CCM—Continuity Check Message
LBM—Loop Back Message
LTM—Link Trace Message
LBR—Loop Back Response
LTR—Loop Trace Response
Operator A
Provider
Customer
Customer
Provider
Operator Operator Operator
Operator B
Operator C
CFM maintenance
Endpoint Intermediate point Bridge port
Any port of a bridge is referred to as a maintenance point which may be classified as either a
maintenance endpoint, maintenance intermediate point. Maintenance endpoints reside at the
edge of a maintenance domain, whereas maintenance intermediate points are internal to the
domain. Each maintenance endpoint is assigned an unique id within its domain.
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