You got me on that. I can't help you. I doesn't look like we've lost
an IBGP connection since Nov 5 at 00:06:37 (E147). 
We only lost a number of EBGP sessions between AS690 and our Cisco
concentrators. We did lose quite a few EBGP sessions to other providers.
It's usually a year or more between anything at all of the magnitude
of an IBGP collapse on our net since about 1992 when rcp_routed
managed 3 backbone wide core dumps in a week so my experience with
this sort of things is quite limited. We still do find an occasional
gated bug though.
I defer to the experts.
Curtis
ps - faster routers in the world. yeah right. so much for the
Bradner tests.