Enabling Bfd Globally; Setting Up A Bfd Session - Huawei AR2200-S Series Configuration Manual

Huawei AR2200-S Series Enterprise Routers
Configuration Guide - Reliability

3.3.2 Enabling BFD Globally

You can perform related BFD configurations only after enabling BFD globally.
Context
Perform the following procedure on the router:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
bfd
BFD is enabled globally and the BFD view is displayed.
----End

3.3.3 Setting Up a BFD Session

By creating a BFD session on both ends of a multi-hop link, you can fast detect the fault on the
multi-hop link.
Context
Perform the following procedure on both ends of a link to be checked:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run the bfd cfg-name bind peer-ip peer-ip [ vpn-instance vpn-instance-name ] [ source-ip
source-ip ] command to configure a BFD session.
l When a BFD session is set up for the first time, you need to bind the peer IP address to it.
l When the BFD configuration items are created, the system checks only the format of the IP
l When the BFD and URPF are used together, URPF checks the source IP address of the
Step 3 Configure the discriminators.
Issue 01 (2012-01-06)
After the BFD session is set up, you cannot modify it.
address rather than the correctness. The BFD session cannot be established if incorrect peer
IP address or source IP address is bound.
received packets. Therefore, when creating a BFD binding, you need to specify the source
IP address of the BFD packet in case the BFD packet is incorrectly discarded.
NOTE
A BFD session currently does not detect route switching. If the change of bound peer IP address causes a
route to switch to another link, the BFD session is negotiated again only when the original link fails.
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