anyone else seeing very long AS paths?

Leland E. Vandervort leland at taranta.discpro.org
Mon Feb 16 12:03:57 CST 2009


http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfbgp1.html#wp1254976

Defaults

The default value in Cisco IOS software for the number argument is 75.



On Mon, 16 Feb 2009, Jon Lewis wrote:

> Why do you say that?  I counted 78 instances of 47868 in this long
> as-path, and our maxas-limit settings did trigger and reject these.
>
> On Mon, 16 Feb 2009, Leland E. Vandervort wrote:
>
> >
> > bgp maxas-limit has a default value of 75 if you don't include it
> > explicitly in the config so in this case it wouldn't have made much of a
> > difference.
> >
> > L.
> >
> >
> > On Mon, 16 Feb 2009, Jon Lewis wrote:
> >
> >> On Mon, 16 Feb 2009, John van Oppen wrote:
> >>
> >>> Yep we saw the same, every customer with old IOS had their sessions die
> >>> to us at the same time...   That always makes for an interesting time
> >>> when watching the NMS system...
> >>
> >> Is there a reason you don't use something like "bgp maxas-limit NN" on
> >> your transit sessions?
> >>
> >> We saw this too, but it stopped at our transit routers.  There was
> >> actually another a few days ago.
> >>
> >> Feb 13 18:46:07: %BGP-6-ASPATH: Long AS path 4323 1299 12887 12741 39412
> >> 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625
> >> 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625
> >> 39625 39625 39625 39625...
> >>
> >> Feb 16 11:24:53: %BGP-6-ASPATH: Long AS path 4323 3257 29113 47868 47868
> >> 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >> 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >> 47868 47868 47868 47868...
> >>
> >>
> >> ----------------------------------------------------------------------
> >>   Jon Lewis                   |  I route
> >>   Senior Network Engineer     |  therefore you are
> >>   Atlantic Net                |
> >> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
> >>
> >
>
> ----------------------------------------------------------------------
>   Jon Lewis                   |  I route
>   Senior Network Engineer     |  therefore you are
>   Atlantic Net                |
> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
>





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