H3C Technologies H3C S7500E Series Switches - Manual (Page 46)

5-11
To do... Use the command... Remarks
Enable LB
cfd loopback service-instance
instance-id mep mep-id
{ target-mep target-mep-id |
target-mac mac-address }
[ number number ]
Required
Disabled by default
Configuring LT on MEPs
LT can trace the path between the specified MEP and the target MEP, and can also locate link faults by
sending LT messages automatically. The two functions are implemented in the following way:
z To implement the first function, the specified MEP first sends LTM messages to the target MEP.
Based on the LTR messages in response to the LTM messages, the path between the two MEPs
can be identified.
z In the latter case, after LT messages automatic sending is enabled, if a MEP fails to receive the
CCMs from the remote MEP within 3.5 sending intervals, the link between the two is considered
faulty and LTMs (with the remote MEP as the destination and the TTL field in the LTMs set to the
maximum value 255) will be sent out. Based on the LTRs that echo back, the fault source can be
located.
Follow these steps to configure LT on MEPs:
To do... Use the command... Remarks
Enter system view system-view —
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 ]
Required
Enable LT messages automatic
sending
cfd linktrace auto-detection
[ size size-value ]
Required
Disabled by default.
Displaying and Maintaining CFD
To do... Use the command... Remarks
Display CFD status display cfd status Available in any view
Display the CFD protocol version display cfd version Available in any view
Display MD configuration
information
display cfd md Available in any view