R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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Step
Command
Remarks
2. Configure the interval field
value in the CCM messages
sent by MEPs.
cfd cc interval interval-value
service-instance instance-id
Optional.
By default, the interval field value is 4.
3. Enter Ethernet interface view.
interface interface-type
interface-number
N/A
4. Enable CCM sending on a
MEP.
cfd cc service-instance
instance-id mep mep-id
enable
Disabled by default.
Configuring LB on MEPs
The 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
Remarks
Enable LB.
cfd loopback service-instance instance-id mep
mep-id { target-mep target-mep-id | target-mac
mac-address } [ number number ]
Disabled by default.
Available in any view.
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 implement the first function, 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.
 In the latter case, 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. LTM frames will be sent out with the target MEP as the
destination and the 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:
Step
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 ]
Disabled by default.