Configuring The Bfd Protocol For Rip - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - IP-IPV6-IGP CONFIGURATION GUIDE 2010-10-31 Configuration Manual

JunosE 11.3.x IP, IPv6, and IGP Configuration Guide

Configuring the BFD Protocol for RIP

address bfd-liveness-detection
ip rip bfd-liveness-detection
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The address bfd-liveness-detection command or the ip rip bfd-liveness-detection
command configures the Bidirectional Forwarding Detection (BFD) protocol for RIP. 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 BFD
timers for more or less aggressive failure detection.
Without BFD, when a RIP peer goes down, the routes learned from that peer are purged
only after each route times out. The timeout is configurable with the timers invalid
command. By default, the timeout is 180 seconds after each route was received or
refreshed. Consequently routes are purged successively over varying time periods rather
than all at once.
In contrast, when a BFD session exists between RIP peers, a peer that goes down is
detected quickly. RIP simultaneously purges all routes learned from that peer and starts
the hold-down timer for each peer.
When you issue the address bfd-liveness-detection command or the ip rip
bfd-liveness-detection command on a RIP peer, the peer establishes BFD liveness
detection with all BFD-enabled RIP peers. When the local peer receives an update from
a remote RIP 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 address bfd-liveness-detection
command or the ip rip 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 RIP data path failures.
Use the address bfd-liveness-detection command when you have used the address
command to configure the RIP network. Use the ip rip bfd-liveness-detection
command when you have used the network command to configure the RIP network.
Copyright © 2010, Juniper Networks, Inc.