[AusNOG] Old route from PIPE NSW

[Joseph Goldman]

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
SYD-COR1#show ip bgp 122.100.13.0/23
BGP routing table entry for 122.100.12.0/23, version 144820877
Paths: (4 available, best #3, table default)
   Advertised to update-groups:
      6          8          10
   18398 7600 10207 10207 10207
     218.100.2.147 from 218.100.2.62 (218.100.2.62)
       Origin IGP, localpref 170, valid, external
   18398 7600 10207 10207 10207, (received-only)
     218.100.2.147 from 218.100.2.62 (218.100.2.62)
       Origin IGP, localpref 100, valid, external
   18398 7600 10207 10207 10207
     218.100.2.147 from 218.100.2.1 (218.100.2.1)
       Origin IGP, localpref 170, valid, external, best
   18398 7600 10207 10207 10207, (received-only)
     218.100.2.147 from 218.100.2.1 (218.100.2.1)
       Origin IGP, localpref 100, valid, external
SYD-COR1#show ip route 122.100.13.1
Routing entry for 122.100.13.0/24
   Known via "bgp 45411", distance 20, metric 0
   Tag 18398, type external
   Last update from 218.100.2.17 7w0d ago
   Routing Descriptor Blocks:
   * 218.100.2.17, from 218.100.2.1, 7w0d ago
       Route metric is 0, traffic share count is 1
       AS Hops 11
       Route tag 18398
SYD-COR1#

On 05/03/14 13:44, Nathan Brookfield wrote:
> nathan at bdr04:~$ show ip bgp 122.100.13.0/24
> % Network not in table
> nathan at bdr04:~$ show ip bgp 122.100.13.0/23
> BGP routing table entry for 122.100.12.0/23
> Paths: (2 available, best #2, table Default-IP-Routing-Table)
>    Advertised to non peer-group peers:
>    223.25.112.1 223.25.112.3
>    18398 7600 10207 10207 10207
>      218.100.2.147 from 218.100.2.62 (218.100.2.62)
>        Origin IGP, localpref 100, valid, external
>        Last update: Mon Mar  3 03:07:16 2014
>
>    18398 7600 10207 10207 10207
>      218.100.2.147 from 218.100.2.1 (218.100.2.1)
>        Origin IGP, localpref 100, valid, external, best
>        Last update: Mon Mar  3 03:07:16 2014
>
> nathan at bdr04:~$
>
> -----Original Message-----
> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Andrew Jones
> Sent: Wednesday, 5 March 2014 12:45 PM
> To: Ausnog
> Subject: [AusNOG] Old route from PIPE NSW
>
> Hi all,
> When tracking down a routing issue today, I discovered a stale route in the routing table on a peering router of ours, learned from PIPE NSW's route servers: 122.100.13.0/24 - it was 44 weeks old and I've lost the exact AS path unfortunately, but it began with "4739 7607 7606 7606 7606".
>
> When I looked, it did not appear in PIPE NSW's route servers' routing tables as seen from their looking glass. Clearing the sessions to the route-servers has resolved the issue and I'm now reaching that subnet via a /23 route which is being advertised.
>
> Is anyone else seeing this route in their tables currently? I'm wondering whether it's my router misbehaving and ignoring some withdraws?
> Thanks,
> Andrew
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