23Table 9 Relationship between the interval field value in the CCM message, the interval between CCMmessages, and the timeout time of the remote MEPThe interval field value inthe CCM messageThe interval between CCMmessages The timeout time of the remote MEP4 1 second 3.5 seconds5 10 second 35 seconds6 60 seconds 210 seconds7 600 seconds 2100 secondsConfiguration procedureTo configure CC on a MEP:Step Command Remarks1. Enter system view. system-view N/A2. Configure the interval fieldvalue in the CCM messagessent by MEPs.cfd cc interval interval-valueservice-instance instance-idOptional.By default, the interval field value is 4.3. Enter Layer 2 Ethernet interfaceview.interface interface-typeinterface-number N/A4. Enable CCM sending on aMEP.cfd cc service-instanceinstance-id mep mep-idenableBy default, CCM sending on a MEP isdisabled.Configuring LB on MEPsThe LB function can verify the link state between the local MEP and the remote MEP or MIP.To configure LB on a MEP:Task Command RemarksEnable LB.cfd loopback service-instanceinstance-id mep mep-id{ target-mep target-mep-id |target-mac mac-address } [ numbernumber ]By default, LB is disabled.Available in any view.Configuring LT on MEPsLT can trace the path between the source and target MEPs, and can also locate link faults by sending LTmessages automatically. The two functions are implemented in the following way:• To implement the first function, the source MEP first sends LTM messages to the target MEP. Basedon the LTR messages in response to the LTM messages, the path between the two MEPs can beidentified.• In the latter case, after LT messages automatic sending is enabled, if the source MEP fails to receivethe CCM frames from the target MEP within 3.5 times the transmission interval, the link between thetwo is considered faulty. LTM frames will be sent out with the target MEP as the destination and the
