Configuring Bfd For Bgp - Cisco 3845 - Security Bundle Router Software Manual

Chapter 29 Configuring IP Unicast Routing
If you only want to run IS-IS BFD on a few interfaces, instead of enabling it globally, you can enter the
isis bfd interface configuration command on those interfaces. See the next procedure.
Note Although IS-IS BFD operates only on Layer 3 interfaces, you can configure it on interfaces in Layer 2
or Layer 3 mode. When you enable it, you see this message:
%ISIS BFD is reverting to router mode configuration, and remains disabled.
This is an example of setting fast convergence and configuring BFD for IS-IS on all IS-IS interfaces:
Switch(config)# router is-is tag1
Switch(config-router)# bfd all-interfaces
Switch(config-router)# exit
Configuring BFD for IS-IS on an Interface
Beginning in privileged EXEC mode, follow these steps to configure IS-IS BFD on an individual
interface:
Command
Step 1 configure terminal
Step 2 router is-is area-tag
Step 3 exit
Step 4 interface interface-id
Step 5 isis bfd
Step 6
end
Step 7
show bfd neighbors [detail]
Step 8
copy running-config startup-config
To disable IS-IS BFD on an interface, enter the no isis bfd or the isis bfd disable interface configuration
command on the interface.
This is an example of configuring BFD for IS-IS on a single interface:
Switch(config)# router is-is tag1
Switch(config-router)# exit
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# isis bfd

Configuring BFD for BGP

When you start BFD sessions for BGP, BGP must be running on all participating devices. You enter the
IP address of the BFD neighbor to enable BFD for BGP.
Beginning in privileged EXEC mode, follow these steps to enable BGP BFD:
Command
Step 1
configure terminal
Step 2
router bgp as-tag
OL-23400-01
Purpose
Enter global configuration mode.
Specify an IS-IS process and enter router configuration mode.
Return to global configuration mode.
(Specify an interface, and enter interface configuration mode.
Enable BFD on the specified IS-IS interface. Repeat Steps 3 and 4 for all
IS-IS interfaces on which you want to run BFD sessions.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Specify a BGP autonomous system, and enter router configuration mode.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Configuring BFD
29-77