[c-nsp] BGP neighbor not establishing session

[Lobo]

I've tried searching around for this problem but haven't found much info.

We upgraded some 7301 routers the other night and there are a couple of 
neighbors which have not been able to re-establish themselves.  
Debugging from one of the routers shows this:

Nov 21 21:06:51.902 EST: BGP: Neighbor validation failed. Flags: 0x10, 
Neighbor-topo check: passed, Router ID: 172.29.1.1
frorr01#
Nov 21 21:07:00.098 EST: BGP: Neighbor validation failed. Flags: 0x10, 
Neighbor-topo check: passed, Router ID: 172.29.1.1
frorr01#
Nov 21 21:07:10.482 EST: BGP: Neighbor validation failed. Flags: 0x10, 
Neighbor-topo check: passed, Router ID: 172.29.1.1
frorr01#

I've also seen some extra info in the "show ip bgp summary" command:

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ 
Up/Down  State/PfxRcd
172.29.2.1      4        20161       2       3        1    0    0 
00:01:35        0 (SE)

Sometimes it's SE and other times it's SPE.

Any thoughts from anyone?

Thanks in advance.

Jose