[c-nsp] Link down affecting BGP peer

[Ted Pelas Johansson]

Try configuring MicroBFD/BoB rather than using Logic bundle/BLB, see more details at https://community.cisco.com/t5/service-providers-blogs/bfd-over-logical-bundle-blb-implementation-on-ncs5500-platforms/ba-p/3309345

/Ted

> On 5 May 2022, at 18:07, Hank Nussbacher <hank at interall.co.il> wrote:
> 
> I have 4 individual links defined as part of a Bundle-ether (IOS-XR  5.3.3 on ASR9010):
> 
> interface TenGigE0/2/0/1
>  bundle id 2 mode active
>  flow-control bidirectional
>  carrier-delay up 100 down 4000
> ! They are all part of a bundle...
> interface Bundle-Ether2
>  mtu 9192
>  bundle minimum-active links 2
> 
> When I shut off just 1 of these 4 links - the bundle stays up yet certain BGP sessions flap for about 5 seconds - different peers depending on which of the 4 links gets turned down.
> 
> My BGP config:
> router bgp 378
>  rpki server x.139.197.151
>   transport tcp port 8282
>   refresh-time 600
>  !
>  bgp log neighbor changes detail
>  address-family ipv4 unicast
>   bgp dampening 5 750 3000 10
>   bgp attribute-download
> !
>  neighbor x.x.125.1
>   remote-as xxxx5
>   address-family ipv4 unicast
>    send-community-ebgp
>    soft-reconfiguration inbound
> 
> What could be causing the bgp peer to flap even though the LAG stays up?
> 
> Thanks,
> Hank
> 
> 
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