24TTL field in the LTM frames set to the maximum value 255. Based on the LTRs that the MIPs return, thefault source can be located.To configure LT on MEPs:Step Command Remarks1. Find the path between a sourceMEP and a target MEP.cfd linktrace service-instanceinstance-id mep mep-id { target-meptarget-mep-id | target-macmac-address } [ ttl ttl-value ] [ hw-only ]Available in any view.2. Enter system view. system-view N/A3. Enable LT messages automaticsending.cfd linktrace auto-detection [ sizesize-value ]By default, LT messagesautomatic sending is disabled.Configuring AISThe AIS function suppresses the number of error alarms reported by MEPs.Configuration guidelines• To have a MEP in the service instance send AIS frames, configure the AIS frame transmission levelto be higher than the MD level of the MEP.• Enable AIS and configure the proper AIS frame transmission level on the target MEP, so the targetMEP can suppress the error alarms and send the AIS frame to the MD of a higher level. If youenable AIS but do not configure the proper AIS frame transmission level on the target MEP, thetarget MEP can suppress the error alarms, but cannot send the AIS frames.Configuration procedureTo configure AIS:Step Command Remarks1. Enter system view. system-view N/A2. Enable AIS. cfd ais enable By default, AIS is disabled.3. Configure the AIS frametransmission level.cfd ais level level-valueservice-instance instance-idBy default, the AIS frametransmission level is notconfigured.4. Configure the AIS frametransmission interval.cfd ais period period-valueservice-instance instance-idOptional.The default is 1 second.Configuring LMThe LM function measures frame loss between MEPs, including the number of lost frames, the frame lossratio, and the average number of lost frames for the source and target MEPs. The LM function takes effectonly in CFD IEEE 802.1ag.To configure LM:
