HP A5120 EI - Configuring LB on Meps; Configuring LT on Meps

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Table 9 Relationship between the interval field value, interval between CCM messages, and timeout time
of the remote MEP
Interval field value
Interval between CCM
messages
Timeout time of the remote
MEP
4
1 second
3.5 seconds
5
10 second
35 seconds
6
60 seconds
210 seconds
7
600 seconds
2100 seconds
Configuring LB on MEPs
The LB function can verify the link state between the local MEP and the remote MEP or MIP.
Follow these steps to configure LB on a MEP:
To do...
Use the command...
Remarks
Enter system view
system-view
—
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 source and target MEPs and can also locate link faults by sending LT
messages automatically. The two functions are implemented in the following way:
 To trace the path between the source MEP and target MEPs
 The source 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.
 To locate link faults by sending LT messages automatically
 After LT messages automatic sending is enabled, if the source MEP fails to receive the CCM
frames from the target MEP within 3.5 times the transmission interval, the link between the two is
considered faulty, and LTM frames—with the target MEP as the destination and the TTL field in
the LTM frames set to the maximum value 255—will be sent out.
 Based on the LTRs that the MIPs return, 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