[AusNOG] Old route from PIPE NSW

[Stavros Patiniotis]

Hi Joseph,

The AS path shown (18398 4739 7600) is over 2 months old.

As someone else has stated, this is probably due to cisco bug
https://tools.cisco.com/bugsearch/bug/CSCsy65589  The problem occurs when a
route withdrawal occurs during a bgp refresh.

In an off-list conversation (whereby a juniper router was affected by the
same problem) it appears that PIPE's route reflectors are a factor in this.
I will raise it with their tech support to see what they say.


-----Original Message-----
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Joseph
Goldman
Sent: Wednesday, 5 March 2014 8:55 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Old route from PIPE NSW

Seems my Cisco is still holding the route, but also has the new route. 
At least it shows you the full path you were after:

SYD-COR1#show ip bgp 122.100.13.0/24
BGP routing table entry for 122.100.13.0/24, version 119031197
Paths: (4 available, best #3, table default)
   Advertised to update-groups:
      6          8          10
   18398 4739 7600 7600 7600 7600 10207 10207 10207 10207 10207
     218.100.2.17 from 218.100.2.62 (218.100.2.62)
       Origin IGP, localpref 170, valid, external
       Community: 4739:0
   18398 4739 7600 7600 7600 7600 10207 10207 10207 10207 10207,
(received-only)
     218.100.2.17 from 218.100.2.62 (218.100.2.62)
       Origin IGP, localpref 100, valid, external
       Community: 4739:0
   18398 4739 7600 7600 7600 7600 10207 10207 10207 10207 10207
     218.100.2.17 from 218.100.2.1 (218.100.2.1)
       Origin IGP, localpref 170, valid, external, best
       Community: 4739:0
   18398 4739 7600 7600 7600 7600 10207 10207 10207 10207 10207,
(received-only)
     218.100.2.17 from 218.100.2.1 (218.100.2.1)
       Origin IGP, localpref 100, valid, external
       Community: 4739:0