BFD not working ISR 4431

[AlexMend]

Hi guys I was wondering if anyone can give some ideas regarding the issue I'm experiencing at this moment we have correctly setup

bfd

between my router  and my BGP neighbor , however when I run the command

sho bfd

neighbors I don't have any output from the

sho ip bgp

neigh I see the following

R1#sho ip bgp neighbors x.x.x.x
BGP neighbor is x.x.x.x, remote AS X, external link
Description: 
Fall over configured for session
BFD is configured. BFD peer is Down. Using BFD to detect fast fallover (multi-hop).

....

R1#sho bfd neighbors
R1#




I found this weird since I have reviewed my config and the neig config and they match.

interface GigabitEthernet0/0/0
bfd interval 500 min_rx 500 multiplier 3
end

router bgp xxx

neighbor x.x.x.x update-source GigabitEthernet0/0/0
neighbor x.x.x.x timers 5 15
neighbor x.x.x.x fall-over bfd

I'm not sure if this is related with any license or the IOS version I'm running which is Cisco IOS XE Software, Version

16.09.05

Technology Package License Information:

-----------------------------------------------------------------
Technology Technology-package Technology-package
Current Type Next reboot
------------------------------------------------------------------
appxk9 None None None
uck9 None None None
securityk9 None None None
ipbase ipbasek9 Permanent ipbasek9

[AlexMend]

Any ideas?

[uwe.kadner]

BFD

should be supported on

IOS XE 16.9.5 IPBASEK9 

Feature ID 

12449 BFD

BGP

multihop client Support

(IPv4/IPv6)

 IP CEF & IP ROUTING

must be enabled (I guess it is...)
- How does the config look like on the remote device (related to

BFD; timers; BGP

config)? 
- Have you tried to run

debug bfd

on both devices?

[AlexMend]

I tried to run a terminal monitor and debug

bfd

packet and I did not got anything

however in the logs I found this, I shutdown the neighbor 

*Jul 17 14:58:11: %BGP-5-NBR_RESET: Neighbor x.x.x.x reset (Admin. shutdown)
*Jul 17 14:58:11: %PARSER-5-CFGLOG_LOGGEDCMD: User:4mb3rgr1s logged command:neighbor x.x.x.x shutdown
*Jul 17 14:58:11: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down Admin. shutdown
*Jul 17 14:58:11: %BGP_SESSION-5-ADJCHANGE: neighbor x.x.x.x IPv4 Unicast topology base removed from session Admin. shutdown
*Jul 17 14:58:11: %BFD-6-BFD_SESS_DESTROYED: BFD-SYSLOG: bfd_session_destroyed, handle:1 neigh proc:BGP, handle:1 act



*Jul 17 15:32:34: %BFD-6-BFD_SESS_CREATED: BFD-SYSLOG: bfd_session_created, neigh IP  x.x.x.x proc:BGP, idb:none handle:1 act
*Jul 17 15:32:34: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up

[AlexMend · Accepted solution]

We found the issue, it appears that the Firepower that I was doing the

bgp

neighborship was setting the

BFD

as single hop and my  ISR as multi hop, we removed the

 ebgp-multihop 2 

command from the router

shut/no shut

the

BGP

neighbor and

BFD

start working