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BGP 91.196.212.0
Incident Report for Network & Infrastructure
Resolved
Nous avons un probleme très bizarre sur le reseau pour router les
packets vers 91.196.212.0. Une annonce erronée est dans nos tables
de routage (qui n'existe pas) et malgré differents reset, filtres
l'annonce reste dans les tables.

rbx-2-6k#sh ip bgp 91.196.212.0
BGP routing table entry for 91.196.212.0/22, version 40176799
Paths: (4 available, best #2, table Default-IP-Routing-Table)
Multipath: eBGP
Advertised to update-groups:
1 4
20804 43244, (Received from a RR-client), (received & used)
213.251.130.58 from 213.251.191.1 (213.251.191.1)
Origin IGP, metric 0, localpref 300, valid, internal
Originator: 213.251.130.2, Cluster list: 213.251.191.1, 213.186.32.34, 213.186.32.95, 213.186.32.4
20804 43244, (Received from a RR-client), (received & used)
213.251.130.58 from 213.251.128.17 (213.251.191.1)
Origin IGP, metric 0, localpref 300, valid, internal, best
Originator: 213.251.130.2, Cluster list: 213.251.191.1, 213.186.32.34, 213.186.32.95, 213.186.32.4
20804 43244, (Received from a RR-client), (received & used)
213.251.130.14 (metric 2) from 213.186.32.202 (213.186.32.4)
Origin IGP, metric 0, localpref 300, valid, internal
Originator: 213.251.130.2, Cluster list: 213.186.32.4
20804 43244, (Received from a RR-client), (received & used)
213.251.130.14 (metric 2) from 213.186.32.221 (213.186.32.95)
Origin IGP, metric 0, localpref 300, valid, internal
Originator: 213.251.130.2, Cluster list: 213.186.32.95, 213.186.32.4

La 1ere annonce n'existe pas. Ni la 2ème.

Update(s):

Date: 2008-09-16 14:03:22 UTC
Bon il y a un bug qqpart sur les cisco ...

Date: 2008-09-16 14:02:38 UTC
C'est correct.

rbx-2-6k#sh ip bgp 91.196.212.0
BGP routing table entry for 91.196.212.0/22, version 45792931
Paths: (3 available, best #2, table Default-IP-Routing-Table)
Multipath: eBGP
Flag: 0x900
Advertised to update-groups:
1 4
3549 20804 43244, (Received from a RR-client), (received & used)
213.251.130.58 from 213.251.130.58 (213.251.130.10)
Origin IGP, metric 0, localpref 300, valid, internal
20804 43244, (Received from a RR-client), (received & used)
213.251.130.14 (metric 2) from 213.186.32.202 (213.186.32.4)
Origin IGP, metric 0, localpref 300, valid, internal, best
Originator: 213.251.130.2, Cluster list: 213.186.32.4
20804 43244, (Received from a RR-client), (received & used)
213.251.130.14 (metric 2) from 213.186.32.221 (213.186.32.95)
Origin IGP, metric 0, localpref 300, valid, internal
Originator: 213.251.130.2, Cluster list: 213.186.32.95, 213.186.32.4


Date: 2008-09-16 14:01:47 UTC
Nous avons coupé les sessions BGP de VSS. Puis couper/remis les
sessions BGP entre rbx1/2, rbx1/gsw1. Seulement après la coupure
de la session rbx1/gsw1, la route a disparu de gsw1 et rbx1.
Mais elle est restée sur ams-1 !

Reset d'ams-1. Ca a disparu.

Nous remettons en place le VSS.

Date: 2008-09-16 13:59:46 UTC
Nous avons coupé le lien vers Londres. L'annonce reste dans nos
tables !!
Posted Sep 16, 2008 - 13:59 UTC