Telia Not Withdrawing v6 Routes

Mon Nov 16 14:17:36 UTC 2020

For those curious, Johan indicated on Twitter this was a JunOS bug.

https://twitter.com/gustawsson/status/1328298914785730561

Matt

> On Nov 15, 2020, at 23:13, Matt Corallo <nanog at as397444.net> wrote:
> 
> 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
>> 
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