[158943] in North American Network Operators' Group
32-bit ASes at routeviews
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Sun Dec 16 17:48:28 2012
From: Iljitsch van Beijnum <iljitsch@muada.com>
Date: Sun, 16 Dec 2012 23:48:13 +0100
To: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Looking for 32-bit AS numbers, I get some strange results from =
routeviews:
route-views>sh ip bgp regexp _23456_
BGP table version is 2393809200, local router ID is 128.223.51.103
Status codes: s suppressed, d damped, h history, * valid, > best, i - =
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* 31.177.16.0/22 128.223.253.10 0 3582 3701 =
3356 23456 3.1043 i
* 46.29.72.0/21 129.250.0.11 285 0 2914 12389 =
12389 12389 12389 23456 3.627 i
* 46.243.96.0/21 154.11.11.113 0 0 852 174 =
39704 39704 23456 3.787 i
* 91.208.62.0/24 154.11.11.113 0 0 852 174 =
39704 39704 23456 3.787 i
* 91.217.87.0/24 194.85.40.15 0 3267 174 =
23456 3.661 i
* 91.230.169.0/24 208.51.134.254 13905 0 3549 29152 =
29152 29152 29152 23456 23456 23456 23456 3.1426 i
* 91.238.8.0/24 194.85.40.15 0 3267 8220 =
23456 3.2040 i
* 111.235.148.0/22 194.85.40.15 0 3267 9498 =
9730 23456 i
* 141.0.176.0/21 129.250.0.11 285 0 2914 12389 =
12389 12389 12389 23456 3.627 i
Unless I missed something, AS 23456 is supposed to show up as a stand-in =
for 32-bit ASNs on 16-bit BGP implementations, not in _addition_ to =
32-bit ASNs. So the penultimate line would make sense if the other lines =
weren't there and the others don't make sense period.
Maybe a bug in the IOS they're running?
route-views>sh ver
Cisco IOS Software, 7200 Software (C7200P-ADVENTERPRISEK9-M), Version =
12.4(24)T2, RELEASE SOFTWARE (fc2)
Or is something else going on?=
