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Cisco Bug: CSCvv29410 - BGP table and RIB are inconsistent in certain VRF leaking scenario

Last Modified

Aug 31, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

15.5(3)S9.1 16.6.7 17.2.1

Description (partial)

Symptom:
A prefix is seen in BGP table and is being advertised to a peer, but it's missing in RIB.

C3#show bgp vpnv4 un vrf C2 192.0.2.0/24
BGP routing table entry for 2:2:192.0.2.0/24, version 19
Paths: (1 available, best #1, table C2)
  Advertised to update-groups:   <<<<
     2         
  Refresh Epoch 1
  Local, imported path from 1:1:192.0.2.0/24 (C1)
    10.0.3.3 (via vrf C0) (via C0) from 0.0.0.0 (3.3.3.3)
...

but it's not in RIB

C3# sh ip route vrf C2 192.0.2.0
Routing Table: C2
% Network not in table

Conditions:
1. Running inter-vrf leaking with import map.
2. Leaking a prefix, from SRC vrf (BGP prefix is locally originated, like static)
3. Leaking the prefix with set ip vrf <3rdVRF> next-hop ...

As the result BGP entry will present for DST vrf (and advertised to peers), but missing in DST vrf RIB.
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