North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: 91.207.218.0/23 prefix in DFZ - AS3.21 / AS196629 - announced with AS_CONFED_SEQUENCE in AS4_PATH - propagated by 35320
On 11 Dec 2008, at 08:34, Florian Weimer wrote: OpenBGPd is therefore dropping the sessions when this update is received. Unideal if this attribute is learned on multiple upstreams...Uhm, shouldn't you just ignore invalid AS4_PATH attributes, instead of dropping the session? It's a transient, optional attribute, so you can't rely on your peers to filter it. Well I have never written written a BGP stack, so I have no code to change as per your suggestion ;-) but as I said on the original post, I'd like to see it as a configurable option, so that I can do the right thing when something breaks. 196629 withdrew the prefix some hours ago and their NOC are investigating. I have asked if they will share some info about the problem when they have chance so that we can understand how to stop this happening in future. They don't use confederations internally so the reason for the break is actually non-obvious. Best wishes Andy
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