Service Manual
• Reception of a CCM with an incorrect CCM transmission interval, which indicates a conguration error.
• Reception of a CCM with an incorrect MEP ID or MAID, which indicates a conguration or cross-connect error. This error could
happen when dierent VLANs are cross-connected due to a conguration error.
• Reception of a CCM with an MD level lower than the receiving MEP, which indicates a conguration 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 notications (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. Congure the transmit interval (mandatory). The interval specied 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. Congure the amount of time the system waits for a remote MEP to come up before the cross-check operation is started.
ETHERNET CFM mode
mep cross-check start-delay number
Sending Loopback Messages and Responses
Loopback message and response (LBM, LBR), also called Layer 2 Ping, is an administrative echo transmitted by MEPs to verify
reachability to another MEP or MIP within the maintenance domain. LBM and LBR are unicast frames.
• Send a Loopback message
EXEC Privilege mode
ping ethernet domain name ma-name ma-name remote {mep-id | mac-addr mac-address}source
{mep-id | port interface}
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