88 | 802.1agw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Enable CCMEnable Cross-checkingLoopback Message and ResponseLoopback Message and Response (LBM, LBR), also called Layer 2 Ping, is an administrative echotransmitted by MEPs to verify reachability to another MEP or MIP within the maintenance domain. LBMand LBR are unicast frames.Linktrace Message and ResponseLinktrace Message and Response (LTM, LTR), also called Layer 2 Traceroute, is an administratively sentmulticast frames transmitted by MEPs to track, hop-by-hop, the path to another MEP or MIP within themaintenance 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.Step Task Command Syntax Command Mode1 Enable CCM. no ccm disableDefault: DisabledECFM DOMAIN2 Configure the transmit interval (mandatory).The interval specified applies to all MEPs inthe domain.ccm transmit-interval secondsDefault: 10 secondsECFM DOMAINTask Command Syntax Command ModeEnable cross-checking. mep cross-check enableDefault: DisabledETHERNET CFMStart the cross-check operation for an MEP. mep cross-check mep-id ETHERNET CFMConfigure the amount of time the system waits for aremote MEP to come up before the cross-check operationis started.mep cross-check start-delaynumberETHERNET CFMTask Command Syntax Command ModeSend a Loopback message. ping ethernet domain name ma-name ma-name remote{mep-id | mac-addr mac-address} source {mep-id | portinterface}EXEC Privilege
