Huawei AR2200-S Series Configuration Manual page 174

Huawei AR2200-S Series Enterprise Routers
Configuration Guide - Reliability
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
The BFD status is associated with and the status of the bound interface.
By default, the BFD session status is not associated with the interface status. That is, the change
of the BFD session status does not affect the interface status.
Step 7 Run:
commit
The configuration is committed.
----End
Example
Run the display bfd session { all | discriminator discr-value | dynamic | peer-ip peer-ip [ vpn-
instance vpn-instance-name ] | static } [ verbose ] command to view information about the BFD
session.
The value of the Proc interface status field is Enable.
Issue 01 (2012-01-06)
NOTE
l 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.
NOTE
l The BFD session does not report the BFD status to the bound interface immediately after the
commit command is executed because the BFD session may not be set up or not Up. This prevents the
BFD session from reporting an incorrect state to the interface. When the BFD status changes, the BFD
session reports the BFD status to the interface to trigger the interface status change.
l If the process-interface-status command has been saved in the configuration file, the initial interface
status must be Down after the device restarts; therefore, the BFD session reports a Down state to the
interface.
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3 BFD Configuration
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