BFD timers on ASR9001

[Jacob Zartmann]

Hi,

I'm doing BFD for BGP on an ASR9001. It has been agreed with the SP that we run with 500ms interval and a multiplier of 3. This is what I have configured:

router bgp 65001
 neighbor 192.168.1.23
 remote-as 8220
 bfd fast-detect
 bfd multiplier 3
 bfd minimum-interval 500

The output of bfd:

I wonder why the interval has been adjusted to 1 s?? I really can't get it to show anything else than 1 s.

Any suggestions?

Thanks.

Best regards,

/JZ

[Fredrik Lönnman · Accepted solution]

You seem to be using BFD HW Offloading, where 500ms timers is not supported

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/routing/configuration/guide/b_routing_cg53xasr9k/b_routing_cg53xasr9k_chapter_0100.html

BFD Session	Timer Interval	Sessions supported on Line Card	Sessions supported on Network Processing Unit
IPv4, IPv6, MPLS-TP	3.3 milliseconds	600	300
IPv4, IPv6	15 milliseconds	2000	1000
IPv4, IPv6	50 milliseconds	8000	3000
IPv4, IPv6	300 milliseconds	8000	3000
IPv4, IPv6	1 second	8000	3000
IPv4, IPv6	2 seconds	8000	3000
IPv4, IPv6	30 seconds	8000	3000

[Jacob Zartmann]

That's it! Missed those restrictions and behaviours. Thanks a lot!

Regards,

/JZ