Telia Not Withdrawing v6 Routes

Mon Nov 16 04:12:26 UTC 2020

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 at 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 at 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 at 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
> 