Followup British Telecom outage reason

[Sean Donelan <sean () donelan com>]

BT is telling ISPs the reason for the multi-hour outage was
a software bug in the interface cards used in BT's core network.
BT installed a new version of the software.  When that didn't fix
the problem, they fell back to a previous version of the software.

BT didn't identify the vendor, but BT is identified as a "Cisco Powered
Network(tm)."  Non-BT folks believe the problem was with GSR interface
cards.  I can't independently confirm it.