Huawei AR2200-S Series Configuration Manual page 176

Huawei AR2200-S Series Enterprise Routers
Configuration Guide - Reliability
BFD is globally enabled and the BFD view is displayed.
Step 3 Run:
default-ip-address ip-address
A default multicast IP address is bound to the BFD session.
By default, BFD uses the multicast IP address 224.0.0.184.
Step 4 Run:
bfd cfg-name bind peer-ip default-ip interface interface-type interface-number
[ source-ip source-ip ]
A BFD session is set up.
Step 5 Configure discriminators:
l Run the discriminator local discr-value command to configure the local discriminator.
l Run the discriminator remote discr-value command to configure the remote discriminator.
Step 6 Run:
process-interface-status sub-if
The association between the BFD session status and the sub-interface status is configured.
Step 7 Run:
commit
The configuration is committed.
When the BFD session becomes Down, the status of the main interface bound to the BFD session
and its sub-interface also becomes Down.
Issue 01 (2012-01-06)
NOTE
Multiple BFD sessions exist on a path on some networks, for example, on the network where Layer 3
interfaces are connected through Layer 2 switching devices that support BFD. In this situation, configure
different default multicast IP addresses for the devices where different BFD sessions are established so
that BFD packets can be correctly forwarded.
NOTE
l The local discriminator of the local system and the remote discriminator of the remote system are the
same; the remote discriminator of the local system and the local discriminator of the remote system
are the same. Otherwise, BFD sessions cannot be established. After the local discriminator and the
remote discriminator are configured, you cannot modify them.
l If a BFD session is bound to the default multicast address, the local discriminator and the remote
discriminator must be different.
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3 BFD Configuration
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