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Configuring the BFD Protocol for IS-IS
isis bfd-liveness-detection
Copyright © 2010, Juniper Networks, Inc.
Use to specify whether IS-IS routes are available only for unicast forwarding, only for
multicast reverse-path forwarding checks, or for both.
Use the show ip route command to view the routes available for unicast forwarding.
Use the show ip rpf-routes command to view the routes available for multicast reverse
path forwarding checks.
By default, IS-IS routes are available for both unicast forwarding and multicast reverse
path forwarding checks.
Example
host1(config)#router isis
host1(config-router)#ip route-type unicast
Use the no version to restore the default value, both.
See ip route-type
The isis bfd-liveness-detection command configures the Bidirectional Forwarding
Detection (BFD) protocol for IS-IS. The BFD protocol uses control packets and shorter
detection time limits to more rapidly detect failures in a network. Also, because they are
adjustable, you can modify the BDF timers for more or less aggressive failure detection.
When you issue the isis bfd-liveness-detection command on an IS-IS peer, the peer
establishes BFD liveness detection with all BFD-enabled IS-IS peers. When the local peer
receives an update from a remote IS-IS peer—if BFD is enabled and if the session is not
already present—the local peer attempts to create a BFD session to the remote peer.
Each adjacent pair of peers negotiates an acceptable transmit interval for BFD packets.
The negotiated value can be different on each peer. Each peer then calculates a BFD
liveness detection interval. When a peer does not receive a BFD packet within the detection
interval, it declares the BFD session to be down and purges all routes learned from the
remote peer.
NOTE: Before the router can use the isis bfd-liveness-detection command,
you must specify a BFD license key. To view an already configured license,
use the show license bfd command.
For general information about configuring and monitoring the BFD protocol, see JunosE
IP Services Configuration Guide.
Use to enable BFD (bidirectional forwarding detection) and define BFD values to more
quickly detect IS-IS data path failures.
The peers in an IS-IS adjacency use the configured values to negotiate the actual
transmit intervals for BFD packets.
Chapter 6: Configuring IS-IS
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