anyone else seeing very long AS paths?

Jake Mertel jake at
Mon Feb 16 17:35:09 UTC 2009

Looks good here too

telnet at ip bgp
Number of BGP Routes matching display condition : 2
Status codes: s suppressed, d damped, h history, * valid, > best, i internal
Origin codes: i - IGP, e - EGP, ? - incomplete
    Network            Next Hop        Metric LocPrf Weight Path
*>   3      100    0      25973 29113 47868 i
*   3      100    0      2828 3257 29113 47868 i


Jake Mertel
Nobis Technology Group, L.L.C.

Phone: (312) 281-5101 ext. 401
Fax: (808) 356-0417

Mail: 201 West Olive Street
Second Floor, Suite 2B
Bloomington, IL 61701

-----Original Message-----
From: John van Oppen [mailto:john at] 
Sent: Monday, February 16, 2009 11:25 AM
To: Andy Davidson
Cc: nanog at
Subject: RE: anyone else seeing very long AS paths?

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...

We are seeing a much more sane path now:

agg2-sea-A>show ip bgp
BGP routing table entry for, version 25944571
Paths: (1 available, best #1)
Multipath: eBGP
  Advertised to update-groups:
     2          3          5          6          7          8          9

  3561 3356 29113 47868 (metric 5102) from (
      Origin IGP, metric 0, localpref 50, valid, internal, best
      Community: 11404:1000 11404:1040

John van Oppen
Spectrum Networks LLC
Direct: 206.973.8302
Main: 206.973.8300

-----Original Message-----
From: Andy Davidson [mailto:andy at]
Sent: Monday, February 16, 2009 9:10 AM
To: John van Oppen
Cc: Matt Liotta; nanog at
Subject: Re: anyone else seeing very long AS paths?


Yep, we see them too.  Nasty because there are lots of networks
flapping as the long as-paths are tickling old bug CSCdr54230, so even
networks not affected by the bug will be getting lots of extra updates.

Anyone with contacts at 47868 ?  Any upstreams onlist that want to bin
them ?


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