[c-nsp] Best Practices for quickly removing routes when BGP peer drops

[Saku Ytti]

Ah, I just saw Jakob's email. I guess Cisco decided what's best for
operators here.


On Wed, 10 Dec 2025 at 19:53, Saku Ytti <saku at ytti.fi> wrote:
>
> I don't think that's true. Perhaps a bug you encountered?
>
> advertise-best-external definitely should work for unlabeled IP.
>
> On Wed, 10 Dec 2025 at 17:14, Gert Doering <gert at greenie.muc.de> wrote:
> >
> > Hi,
> >
> > On Wed, Dec 10, 2025 at 05:01:25PM +0200, Saku Ytti via cisco-nsp wrote:
> > > a) fast-external-fallover is default, you can break it by doing
> > > multipath (e.g. some configuration related to blackholing next-hop
> > > manipulation or GTSM may break it)
> > > b) you may not need 'add-path' to have backup, if you have full-mesh
> > > 'advertise-best-external' if enough. If you have RR you need both.
> >
> > "advertise-best-external" was indeed what I was thinking about, thanks.
> >
> > (Note that on IOS XR this only works if you use labeled unicast, as
> > we found out to our dismay...)
> >
> > gert
> > --
> > "If was one thing all people took for granted, was conviction that if you
> >  feed honest figures into a computer, honest figures come out. Never doubted
> >  it myself till I met a computer with a sense of humor."
> >                              Robert A. Heinlein, The Moon is a Harsh Mistress
> >
> > Gert Doering - Munich, Germany                             gert at greenie.muc.de
>
>
>
> --
>   ++ytti



-- 
  ++ytti