H3C S5120-EI Series - Configuring LB on Meps; Configuring LT on Meps

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Table 9 Relationship between the interval field value in the CCM message, the interval between CCM
messages, and the timeout time of the remote MEP
The interval field value in
the CCM messa
g
e
The interval between CCM
messa
g
es
The 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
Configuration procedure
To configure CC on a MEP:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
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 Layer 2 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
By default, CCM sending on a MEP is
disabled.
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 ]
By default, LB is disabled.
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