BFD on Cisco XR

[sachin30720041]

Hello,

I am trying to configure bfd on cisco XR routers under ospf process.

R1-------R2

router ospf 1

bfd fast-detect

But when I execute 'show bfd session' I do not see any output of the command.

What configuration I am missing?

Thanks,

Sachin

[Flavio Miranda]

The B in BFD means 'bidirectional'. Make sure others routers are prepared  for BFD as well.

Take a look on this doc.

Look Prerequisites for Bidirectional Forwarding Detection  and

Restrictions for Bidirectional Forwarding Detection

https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html 

[pman]

Hi,

Some information about BFD for IOS-XR, and how to configure it properly for OSPF:

When using BFD with OSPF, consider the following guidelines:

• BFD establishes sessions from a neighbor to a designated router (DR) or backup DR (BDR) only when the neighbor state is full.

• BFD does not establish sessions between DR-Other neighbors (for example, when their OSPF states are both 2-way).

BFD Over OSPF:

The following example shows how to enable BFD for OSPF on a Gigabit Ethernet interface:

RP/0/RP0/CPU0:router#configure
RP/0/RP0/CPU0:router(config)#router ospf 0
RP/0/RP0/CPU0:router(config-ospf)#area 0
RP/0/RP0/CPU0:router(config-ospf-ar)#interface gigabitEthernet 0/3/0/1
RP/0/RP0/CPU0:router(config-ospf-ar-if)#bfd fast-detect
RP/0/RP0/CPU0:router(config-ospf-ar-if)#commit
RP/0/RP0/CPU0:router(config-ospf-ar-if)#end

!

RP/0/RP0/CPU0:router#show run router ospf

router ospf 0
area 0
interface GigabitEthernet0/3/0/1
bfd fast-detect

Attaches a BFD document for iOS-XR

https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/interfaces/configuration/guide/hc42bifw.html#wp1021342

https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/interfaces/configuration/guide/hc42bifw.html#wp1013098