Question about normal ops - BGP Flaps nightly

Thu Nov 21 09:47:53 UTC 2019

> On Nov 21, 2019, at 4:45 AM, Christopher Morrow <morrowc.lists at gmail.com> wrote:
> 
> Howdy!
> A question of interest to me, currently, is whether it's normal for
> providers to cause BGP flaps to their customers nightly... This seems,
> in my case, to be the provider PROBABLY updating prefix-filters on my
> session(s).
> 
> Particularly AS56554 is currently getting v4/v6 transit from 2
> providers, one of which we have 2 links toward. That provider appears
> to flap both of our ipv6 (only) bgp peers each night at about the same
> time each night. This smells like: "filter updates', but something
> that's different than the v4 filter update? (or perhaps they have no
> v4 filtering to update?)
> 
> In the end, should customers expect nightly (or on a regular cadence)
> to see their sessions bounce? It hasn't been my experience in other
> situations...

This seems unusual, perhaps a bug in their tooling or their config where it’s doing a hard clear vs soft clear on the session?

- Jared