Configuring BFD

[Madura Malwatte]

I followed the configuration guide to configure BFD but it isn't seem to be working. I have a eBGP peer directly connected off a physical interface on a leaf node. The peering and everything is working, and I am just trying to add BFD to this peering. Basically I configured a BFD policy and associated it in my switch policy group. Then to my existing switch profile I associated the switch policy group to leaf selector. 

I am not getting any output in BFD process for that leaf node, or via the cli (show bfd ipv4 neighbors details). How can I troubleshoot this? Am I missing something obvious?

[micgarc2 · Accepted solution]

Hello,

I am using eBGP with SVIs and got it working fine. I did not do it globally but per interface level:

Config on external 5K:

!

feature bfd
!
interface Vlan1303
description SVI to Leaf103 bgp_pod1 - Michael
no shutdown
vrf member mg1
bfd interval 250 min_rx 250 multiplier 3
no ip redirects
ip address 192.168.4.2/24

router bgp 100
vrf mg1
address-family ipv4 unicast
neighbor 192.168.3.1 remote-as 200
bfd
update-source Vlan1303
address-family ipv4 unicast

ACI (make sure you enable it under the peer connectivity profile, see second screenshot).

a-leaf101# show bfd neighbors vrf MG:v1
OurAddr NeighAddr LD/RD RH/RS Holdown(mult) State Int Vrf
192.168.3.1 192.168.3.3 1090519123/1090519041 Up 750(3) Up Vlan123 MG:v1

If you want to enable it globally:

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L3_config/b_Cisco_APIC_Layer_3_Configuration_Guide/b_Cisco_APIC_Layer_3_Configuration_Guide_chapter_0100.html#ariaid-title26

Obviously depending on the platform the external device config will change slightly.

If you are still having trouble with doing it globally let me know and I will lab it up for you.

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Regards,

Michael G.

[Madura Malwatte]

Hi Michael,

Thanks so much for your help. This is what I was missing - the check box for BFD under BGP peer connectivity profile. However I dont see the BFD interface profile option like you do.

My configuration isn't global I believe, since my switch policy to enable BFD is tied to an interface policy for a single interface (ebgp uplink)?

[micgarc2]

Yup in that case it is a per-interface BFD policy over BGP since its configured under a single Logical Interface Profile instance it will only tie to what is encompassed in that Logical Interface Profile. Global BFD configuration is on a per leaf basis.

Thanks,

Michael G.