Re: do i smell a spanning tree loop...
Router error sounds a bit like a generic "IT" problem for a network organisation.
I wondered if someone might say that.
Even if the "router" in question was faulty, why did it take so long to resolve? No failover? Configuration balls up? No. Either this was something a lot bigger than the sum of one router (or indeed smaller so that they couldn't see what it was) or they are covering their arses.
Given the money and reputation (if any) that this has likely cost BT, I'd expect at least one head to roll.