Configuring a Policy for Dynamically Establishing a BGP BFD Session

BGP BFD sessions can be dynamically established based on either host addresses or an IP address prefix list.

The policies for dynamically establishing BGP BFD sessions are as follows:

Host address-based policy: used when all host addresses are available to trigger the creation of BGP BFD sessions.
IP address prefix list-based policy: used when only some host addresses can be used to establish BFD sessions.

Perform the following steps on the ingress of an E2E BGP tunnel:

Run system-view
The system view is displayed.
(Optional) Run ip ip-prefix ip-prefix-name [ index index-number ] { permit | deny } ipv4-address mask-length [ match-network ] [ greater-equal greater-equal-value ] [ less-equal less-equal-value ]
An IPv4 address prefix list is configured, and list entries are configured.

You can perform this step when you want to use an IP address prefix list to dynamically establish BGP BFD sessions. For configuration details about how to configure an IP address prefix list, see Configuring an IPv4 Address Prefix List.
Run mpls
The MPLS view is displayed.
Run mpls bgp bfd-trigger-tunnel { host | ip-prefix ip-prefix-name }
A policy for dynamically establishing a BGP BFD session is configured.

After a policy is configured, the device starts to dynamically establish a BFD session.
Run commit
The configuration is committed.