H3C S5120-EI Series - Configuring AIS; Configuring LM

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TTL field in the LTM frames set to the maximum value 255. Based on the LTRs that the MIPs return, the
fault source can be located.
To configure LT on MEPs:
Ste
p
Command Remarks
1. Find the path between a source
MEP and a target MEP.
cfd linktrace service-instance
instance-id mep mep-id { target-mep
target-mep-id | target-mac
mac-address } [ ttl ttl-value ] [ hw-only ]
Available in any view.
2. Enter system view.
system-view N/A
3. Enable LT messages automatic
sending.
cfd linktrace auto-detection [ size
size-value ]
By default, LT messages
automatic sending is disabled.
Configuring AIS
The 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 level
to 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 target
MEP can suppress the error alarms and send the AIS frame to the MD of a higher level. If you
enable AIS but do not configure the proper AIS frame transmission level on the target MEP, the
target MEP can suppress the error alarms, but cannot send the AIS frames.
Configuration procedure
To configure AIS:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enable AIS.
cfd ais enable By default, AIS is disabled.
3. Configure the AIS frame
transmission level.
cfd ais level level-value
service-instance instance-id
By default, the AIS frame
transmission level is not
configured.
4. Configure the AIS frame
transmission interval.
cfd ais period period-value
service-instance instance-id
Optional.
The default is 1 second.
Configuring LM
The LM function measures frame loss between MEPs, including the number of lost frames, the frame loss
ratio, and the average number of lost frames for the source and target MEPs. The LM function takes effect
only in CFD IEEE 802.1ag.
To configure LM: