nanog mailing list archives
Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ?
From: Joe Provo <nanog-post () rsuc gweep net>
Date: Mon, 17 Aug 2009 17:48:40 -0400
On Mon, Aug 17, 2009 at 03:37:07PM -0600, randal k wrote:
Yep, we started seeing this right around 12:20pm MST. We saw it from a customer's rapidly-flapping BGP peer. We told them to configure bgp maxas-limit, but apparently CRS1s don't have that command. Anybody have a handy route-map that will deny anything with a as-path longer than say 15-20? ;-)
Been a while since I had to throw this on cisco, but I since it lacks sane repeat constraint, you have to either choose to iterate over your acceptable space or deny on the longer-than-acceptable. For the latter, ^[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_([0-9]+_)+ clobbers 15 ASNs and longer. -- RSUC / GweepNet / Spunk / FnB / Usenix / SAGE
Current thread:
- Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Adam Hebert (Aug 17)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ballard, Eric (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? James Bensley (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? randal k (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Joe Provo (Aug 17)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ballard, Eric (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Jared Mauch (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ricky Beam (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Paul Ferguson (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Marko Milivojevic (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Brett Watson (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Kevin Oberman (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Joe Provo (Aug 17)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ballard, Eric (Aug 17)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Dylan Ebner (Aug 18)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ivan Pepelnjak (Aug 18)