Reference Guide

180 | Bidirectional Forwarding Detection
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Configuring BFD for IS-IS
BFD for IS-IS is supported on platform: e
When using BFD with IS-IS, the IS-IS protocol registers with the BFD manager on the RPM. BFD
sessions are then established with all neighboring interfaces participating in IS-IS. If a neighboring
interface fails, the BFD agent on the line card notifies the BFD manager, which in turn notifies the IS-IS
protocol that a link state change occurred.
Configuring BFD for IS-IS is a two-step process:
1. Enable BFD globally. Refer to Enabling BFD globally.
2. Establish sessions for all or particular IS-IS neighbors. Refer to Establishing sessions with IS-IS
neighbors.
Related configuration tasks
• Changing IS-IS session parameters.
• Disabling BFD for IS-IS.
Establishing sessions with IS-IS neighbors
BFD sessions can be established for all IS-IS neighbors at once or sessions can be established for all
neighbors out of a specific interface.
Figure 11-7. Establishing Sessions with IS-IS Neighbors
R1: Level 1 - 2
R2: Level 2
fnC0041m
p
4/24
2/1
AREA 1
AREA 2
F
TOS(conf)# router isis
F
TOS(conf-router_isis)# net 01.1921.6800.1001.00
F
TOS(conf-router_isis)# interface gigabitethernet 4/24
F
TOS(config-if-gi-4/24)# ip address 2.2.2.1/24
F
TOS(config-if-gi-4/24)# ip router isis
F
TOS(config-if-gi-4/24)# exit
F
TOS(conf)# router isis
F
TOS(conf-router_isis)# bfd all-neighbors
FTOS(conf)# router isis
FTOS(conf-router_isis)# net 02.1921.6800.2002.00
FTOS(conf-router_isis)# interface gigabitethernet 2/1
FTOS(conf-if-gi-2/1)#ip address 2.2.2.2/24
FTOS(config-if-gi-2/1)# ip router isis
FTOS(config-if-gi-2/1)# exit
FTOS(conf)# router isis
FTOS(conf-router_isis)# bfd all-neighbors
R3: Level 1 - 2
6/0
AREA 3
FTOS(conf)# router isis
FTOS(conf-router_isis)# net 03.1921.6800.3003.00
FTOS(conf-router_isis)# interface gigabitethernet 6/0
FTOS(conf-if-gi-6/0)#ip address 2.2.3.2/24
FTOS(config-if-gi-6/0)# ip router isis
FTOS(config-if-gi-6/0)# exit
FTOS(conf)# router isis
FTOS(conf-router_isis)# bfd all-neighbors
2/2
6/1
FTOS(conf-router_isis)# interface gigabitethernet 2/2
FTOS(conf-if-gi-2/2)#ip address 2.2.3.1/24
FTOS(config-if-gi-2/2)# ip router isis
FTOS(config-if-gi-2/2)# exit
FTOS(conf)# router isis
FTOS(conf-router_isis)# bfd all-neighbors
FTOS(conf-router_isis)# interface gigabitethernet 6/
1
FTOS(conf-if-gi-6/1)#ip address 2.2.4.1/24
Non-IS-IS Participating System