[quagga-users 14568] Re: iBGP not propagating v6 route problem (again)

On Wed, Dec 21, 2016 at 10:44:34PM +0000, Paul Thornton wrote:
> > https://bugzilla.quagga.net/show_bug.cgi?id=870
>
> [..snip..]
> 
> I just read through that bug report - and it looks like I'm seeing almost
> exactly the same thing, except for me it is a route learned from a peer that
> the box isn't passing on.  So we have your case (network statement) and mine
> (learned route from elsewhere) - it does seem that it is the iBGP
> advertising that is at fault.

I'm now seeing your exact issue where bgpd is not passing on a route
that's learned elsewhere, too.

> I also have a consistently >0 OutQ on the peers that are not being sent the
> prefix.
> 
> The nexthop cache, however, looks sane:

Interesting, maybe that's a red herring.

> I also have bgp debugging enabled.  This is what I see in the log when the
> iBGP peer is brought up - no sign of any attempt to actually send an update
> to the iBGP peer.  I'm not sure about that 'NH unresolved' message - it may
> or may not be related.
> 
> 2016/12/19 11:55:39 BGP: %ADJCHANGE: neighbor 2001:1420::7e Up
> 2016/12/19 11:55:39 BGP: 2001:1420::7e rcvd UPDATE w/ attr: , origin i,
> mp_nexthop 2001:1420::7e, localpref 100, path
> 2016/12/19 11:55:39 BGP: 2001:1420::7e rcvd ::/0
> 2016/12/19 11:55:39 BGP: bgp_update_main(0.0.0.0): NH unresolved
> 2016/12/19 11:55:39 BGP: parse nexthop update(2001:1420:16:2::1/128):
> metric=0, #nexthop=0
> 2016/12/19 11:55:39 BGP: parse nexthop update(2001:1420:16:2::1/128):
> metric=1, #nexthop=1
> 2016/12/19 11:55:39 BGP: Zebra send: IPv6 route add ::/0 nexthop
> 2001:1420:16:2::1 metric 0 tag 0
> 2016/12/19 11:55:58 BGP: 2001:1420:16:3::1 send UPDATE ::/0

My logs are similar - no help here.

> I do have this currently and reliably broken on a lab environment router, so
> can do additional debugging etc. if someone wants to make suggestions.

Same here!  Although, I'm wondering if I restart bgpd enough, it'll go
away.  I have a feeling it's something circumstantial but this is pure
speculation.

- Mark

-- 
Mark Kamichoff
prox-1QuQYt+lk/[email protected]
http://www.prolixium.com/