Dell S4820T, Configuration Manual

Page: 104 / 1178

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 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 }
Sending Linktrace Messages and Responses
Linktrace message and response (LTM, LTR), also called Layer 2 Traceroute, is an administratively sent
multicast frames transmitted by MEPs to track, hop-by-hop, the path to another MEP or MIP within the
maintenance domain.
All MEPs and MIPs in the same domain respond to an LTM with a unicast LTR. Intermediate MIPs forward
the LTM toward the target MEP.
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