Enabling Ccm; Enabling Cross-Checking; Sending Loopback Messages And Responses; Sending Linktrace Messages And Responses - Dell S4048–ON Configuration Manual

• 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

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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