Cisco ME 3400 - Page 804

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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 35 Configuring IP Unicast Routing
Configuring BFD
To disable IS-IS BFD on all interfaces, enter the no bfd all-interfaces router configuration command.
To disable it on the specified interface, enter the no isis bfd or the isis bfd disable interface configuration
command on the interface.
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:
Step 3
bfd all-interfaces Enable BFD globally on all interfaces associated with the IS-IS routing
process.
Step 4
exit (Optional) Return to global configuration mode if you want to disable BFD
on one or more IS-IS interfaces.
Step 5
interface interface-id (Optional) Specify an interface and enter interface configuration mode.
Step 6
ip router isis (Optional) Enable IPv4 IS-IS routing on the interface.
Step 7
isis bfd disable (Optional) Disable BFD on the IS-IS interface. Repeat Steps 5 through 7
for all IS-IS interfaces on which you do not want to run BFD sessions.
Step 8
end Return to privileged EXEC mode.
Step 9
show bfd neighbors [detail] Verify the configuration.
Step 10
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
router is-is area-tag Specify an IS-IS process and enter router configuration mode.
Step 3
exit Return to global configuration mode.
Step 4
interface interface-id (Specify an interface, and enter interface configuration mode.
Step 5
isis bfd 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.
Step 6
end Return to privileged EXEC mode.
Step 7
show bfd neighbors [detail] Verify the configuration.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.