Service Manual

Frames at Frames from UP-MEP Action Down-MEP Action MIP Action
Greater than my level Bridge-relay side or
Wire side
Forward Forward Forward
All the remote MEPs in the maintenance domain are defined on each MEP. Each MEP then expects a periodic CCM from the
configured list of MEPs. A connectivity failure is then defined as:
• Loss of three consecutive CCMs from any of the remote MEP, which indicates a network failure.
• Reception of a CCM with an incorrect CCM transmission interval, which indicates a configuration error.
• Reception of a CCM with an incorrect MEP ID or MAID, which indicates a configuration or cross-connect error. This error
could happen when different VLANs are cross-connected due to a configuration error.
• Reception of a CCM with an MD level lower than the receiving MEP, which indicates a configuration or cross-connect error.
• Reception of a CCM containing a port status/interface status TLV, which indicates a failed bridge or aggregated port.
The continuity check protocol sends fault notifications (Syslogs, and SNMP traps, if enabled) whenever you encounter any of
the these errors.
Enabling CCM
To enable CCM, use the following commands.
1 Enable CCM.
ECFM DOMAIN mode
no ccm disable
The default is Disabled.
2 Configure the transmit interval (mandatory). The interval specified applies to all MEPs in the domain.
ECFM DOMAIN mode
ccm transmit-interval seconds
The default is 10 seconds.
Enabling Cross-Checking
To enable cross-checking, use the following commands.
1 Enable cross-checking.
ETHERNET CFM mode
mep cross-check enable
The default is Disabled.
2 Start the cross-check operation for an MEP
ETHERNET CFM mode
mep cross-check mep-id
3 Configure the amount of time the system has to wait for a remote MEP to come up before the cross-check operation is
started.
ETHERNET CFM mode
mep cross-check start-delay number
802.1ag 91