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Cisco Bug: CSCuw33593 - Outdated version of BGP route is stuck in BGP table

Last Modified

Dec 07, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.3.ROUT

Description (partial)

Symptom:
One or few BGP routes have incorrect "SendTblVer" which was stuck months ago.
These routes are not installed into FIB, clearing BGP session doesn't help:

RP/0/RP0/CPU0:R1#show bgp all all summary
Thu Sep 10 13:56:43.629 CET

Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer SendTblVer  StandbyVer
Speaker       3892359073  3892359027  3892359073 3892359027  3892359027  3892359073

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
5.5.5.227     0  65000 12500287 177962678 *3892359027* 0    0 11:38:36      89587    <<<<< currently used table version

RP/0/RP0/CPU0:s-bb4#show bgp ipv4 unicast 1.1.1.1
Thu Sep 10 13:54:00.549 CET
BGP routing table entry for 1.1.1.1/24
Versions:
   Process           bRIB/RIB  SendTblVer
   Speaker         3881984199 3881984199 <<<<<<<< table version in use for this route
Last Modified: Feb 27 21:05:55.149 for 27w5d <<<<< route is stuck since Feb 27, but we know that BGP session was reset on Sep 10
Paths: (2 available, best #1)
   Advertised to update-groups (with more than one peer):
     0.1 0.4 0.5
   Path #1: Received by speaker 0
   Advertised to update-groups (with more than one peer):
     0.1 0.4 0.5
   Local, (Received from a RR-client)
     5.5.5.227 (metric 1002) from 5.5.5.227 (5.5.5.1)
       Origin incomplete, metric 0, localpref 100, valid, internal, best, group-best, import-candidate
       Received Path ID 0, Local Path ID 1, version 3881984199
       Community: 65000:1000 65000:30000 65000:30200
<cut>

This route is missing in "show route" and "show cef" outputs.

Conditions:
Seeing on XR 5.1.3
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