32-bit ASes at routeviews

John Kemp kemp at network-services.uoregon.edu
Tue Dec 18 22:24:58 UTC 2012


On 12/16/12 2:48 PM, Iljitsch van Beijnum wrote:
> 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?

Off topic, this reminds me I would rather have ASPLAIN
again.  We switched a couple of years ago on a particular
user request.

If there is no objection, I would love to switch back
ASAP.  This would be on route-views, and on route-views3.
Just asking if others concur?

-- 
John Kemp (kemp at routeviews.org)
RouteViews Engineer
NOC: noc at routeviews.org
MAIL: help at routeviews.org
WWW: http://www.routeviews.org




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