Re: Telia Not Withdrawing v6 Routes

[Matt Corallo <nanog () as397444 net>]

Maybe? Never been an issue before. In this case the route does have a depref community on Telia hence why one wouldn’t 
expect it via the same path, but the other ghost route in question never had anything similar.

Matt

> On Nov 15, 2020, at 23:07, Olivier Benghozi <olivier.benghozi () wifirst fr> wrote:
>
> One of the routing gears on the path don't like the large community inside those routes maybe ? :)
> By the way we currently see 2620:6e:a002::/48 at LINX LON1 from Choopa and HE...
>
> > Le 16 nov. 2020 à 04:44, Matt Corallo <nanog () as397444 net> a écrit :
> >
> > Yea, I did try that on that test prefix but it just stuck around anyway.. I don't care too much, its just some stale 
> > test prefix.
> >
> > Sadly, I now see it again with 2620:6e:a002::/48, which, somewhat more impressively, is now generating a routing 
> > loop Ashburn <-> NYC, and has always been announced from other places has was dropped/re-announced as wel.
> >
> > Must just be something with my particular prefixes, oh well.
> >
> > Matt
> >
> > > On 11/15/20 10:40 PM, Olivier Benghozi wrote:
> > > Probably a ghost route. Such thing happens :(
> > > https://labs.ripe.net/Members/romain_fontugne/bgp-zombies
> > > Their (nice) LG shows that it's still advertised from a router of theirs in Frankfurt (iBGP next hop 
> > > ::ffff:2.255.251.224 – so by the way they use 6PE).
> > > Your best option would probably be to re-advertise the exact same prefix, then re-withdraw it, then yell at Telia's 
> > > NOC if it fails...
> > > Some years ago we experienced something similar (it was a router of TI Sparkle still advertising a prefix of us in 
> > > Asia to their clients, that they were previously receiving from our former transit GTT – we were advertising it in 
> > > Europe...).
> > > > Le 16 nov. 2020 à 02:58, Matt Corallo <nanog () as397444 net> a écrit :
> > > >
> > > > Has anyone else experienced issues where Telia won't withdraw (though will happily accept an overriding) prefixes 
> > > > for the past week, at least?
> > > >
> > > > eg 2620:6e:a003::/48 was a test prefix and should not now appear in any DFZ, has not been announced for a few days 
> > > > at least, but shows up in Telia's LG and RIPE RIS as transiting Telia. Telia's LG traceroute doesn't of course, go 
> > > > anywhere, traces die immediately after a hop or with a !N.
> > > >
> > > > Wouldn't be a problem except that I needed to withdraw another route due to a separate issue which wouldn't budge 
> > > > out of Telia's tables until it was replaced with something else of higher pref.
> > > >
> > > > Matt