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BFD issue with BGP support on Cisco 9396PX

Network Engineering Asked by Satish on July 23, 2020

I have following BGP configuration and trying to reduce my convergence time with help of BFD but having hard time.

router bgp 1111
  log-neighbor-changes
  address-family ipv4 unicast
    network 22.22.22.0/24
  neighbor 11.11.11.1
    bfd
    remote-as 2222
    update-source loopback160
    ebgp-multihop 2
    address-family ipv4 unicast
      send-community

This is what i did to enable BFD

feature bfd
bfd interval 500 min_rx 500 multiplier 5
bfd echo-interface loopback160
!
router bgp 1111
  neighbor 11.11.11.1
    bfd

Now when i run (no output), that means BGP isn’t registered to BFD, if i enable OSFP then i can see some output in show bfd neighbors command. I tried debug and no output in debug logs. trying to understand why BGP not getting registered. (My peer ISP did enabled BDF their side) my nxos version is 7.0(3)I4(7)

# show bfd neighbors
#

One Answer

NX-OS 7.x likely does not support BFD BGP Multihop

BFD BGP multihop support was introduced in NX-OS 8.1(1) according to the NX-OS 7K Command Guide.

BFD BGP multihop support was introduced in NX-OS 9.2(1) according to the NX-OS 9K Command Guide.

The NX-OS 5.x Command Guide explicitly calls out support for only for single-hop EBGP and iBGP peers.

Finally, multi-hop is only supported on the newer ASIC's (-EX and newer) and not the 9396PX hardware platform, according to the Guidelines and Limitations for BFD Multihop in the NX-OS 9K Command Guide. Thanks, @rnxrx for pointing this out as well.


You should be able verify by looking for the multihop command:

Example

R1(config)# bfd ?
    echo-interface    Configure interface used for bfd echo frames
    echo-rx-interval  Configure BFD session echo rx interval
    interval          Configure BFD session interval parameters
    ipv4              Ipv4 sessions
    ipv6              Ipv6 sessions
    multihop          Configure BFD Multihop session interval parameters
    slow-timer        Configure slow mode timer for sessions
    startup-timer     Configure Delayed Start Up timer for sessions

Correct answer by TDurden on July 23, 2020

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