[c-nsp] N7K, 6.1(1), F2 Agg VDC, M1 Core VDC, BGP flap

[Tim Durack]

N7K, 6.1(1), F2 Agg VDC running EBGP over vrf-lite to an M1 Core VDC.

Creating/deleting/shut/no-shut on an IP interface in the F2 Agg VDC
causes all BGP sessions to flap:

AGG-RTR-1# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
AGG-RTR-1(config)# int lo999

<ssh hang while BGP flaps>

AGG-RTR-1(config)# end
AGG-RTR-1#

AGG-RTR-1# sh bgp ipv4 unicast summary vrf V100
BGP summary information for VRF V100, address family IPv4 Unicast
BGP router identifier 10.0.0.13, local AS number 64512
BGP table version is 207, IPv4 Unicast config peers 2, capable peers 2
0 network entries and 0 paths using 0 bytes of memory
BGP attribute entries [0/0], BGP AS path entries [0/0]
BGP community entries [0/0], BGP clusterlist entries [0/0]

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.0.0.11     4 65116   96398   96409      207    0    0 00:00:01 0
10.0.0.21     4 65116   96388   96406      207    0    0 00:00:02 0

2012 Oct 20 15:20:43.401 AGG-RTR-1 %BGP-5-ADJCHANGE:  bgp-64512 [7896]
(V100) neighbor 10.1.0.11 Down - other configuration change
2012 Oct 20 15:20:43.401 AGG-RTR-1 %BGP-5-ADJCHANGE:  bgp-64512 [7896]
(V100) neighbor 10.1.0.21 Down - other configuration change

2012 Oct 20 15:20:54.624 AGG-RTR-1 %BGP-5-ADJCHANGE:  bgp-64512 [7896]
(V100) neighbor 10.1.0.21 Up
2012 Oct 20 15:20:56.878 AGG-RTR-1 %BGP-5-ADJCHANGE:  bgp-64512 [7896]
(V100) neighbor 10.1.0.11 Up

BGP sessions in all VRFs are affected. Not a nice discovery.

I've searched known caveats and Cisco's bug database, without seeing
anything similar. Anyone else run into this?

I have a TAC case open. Will see what Cisco comes back with.

-- 
Tim:>