nanog mailing list archives
Re: Long AS Path
From: sthaug () nethelp no
Date: Wed, 21 Jun 2017 09:56:26 +0200 (CEST)
Just wondering if anyone else saw this yesterday afternoon ? Jun 20 16:57:29:E:BGP: From Peer 38.X.X.X received Long AS_PATH=3D AS_SEQ(2= ) 174 12956 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 234= 56 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 = 23456 23456 23456 23456 23456 ... attribute length (567) More than configur= ed MAXAS-LIMIT
There are quite a few examples of people using stupidly long AS paths. For instance 177.23.232.0/24 *[BGP/170] 00:52:40, MED 0, localpref 105 AS path: 6939 16735 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 28163 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262401 262949 52938 52938 52938 52938 52938 52938 52938 52938 52938 52938 52938 I I currently have 27 prefixes in my Internet routing table with 40 or more ASes in the AS path (show route aspath-regex ".{40,}"). I see no valid reason for such long AS paths. Time to update filters here. I'm tempted to set the cutoff at 30 - can anybody see a good reason to permit longer AS paths? Steinar Haug, Nethelp consulting, sthaug () nethelp no
Current thread:
- Long AS Path James Braunegg (Jun 20)
- Re: Long AS Path Olivier Benghozi (Jun 20)
- Re: Long AS Path Laszlo Hanyecz (Jun 20)
- Re: Long AS Path sthaug (Jun 21)
- Re: Long AS Path Randy Bush (Jun 21)
- Re: Long AS Path Stephen Satchell (Jun 21)
- Re: Long AS Path sthaug (Jun 21)
- Re: Long AS Path Mel Beckman (Jun 21)
- Re: Long AS Path Pierfrancesco Caci (Jun 21)
- Re: Long AS Path jim deleskie (Jun 22)
- Re: Long AS Path Mel Beckman (Jun 22)
- Re: Long AS Path Bob Evans (Jun 21)
- Re: Long AS Path Saku Ytti (Jun 21)