[c-nsp] OSPF fast convergence

[Phil Mayers]

>> Seconds? Wow. I'm curious - under what circumstances are you seeing such 
>> length link-loss detection times?
> 
> On our 7600s today.  We drop a link to one of them and the thing is 
> oblivious to the drop for 2-3 seconds.  Dumber than a post...  L3 is 
> waiting on L1 to wake up before it can start tearing down routing 
> relationships and pulling routes.  I'm running SRB1 on my 7600s right 
> now so that I can run BFD.  I'm trying to get my account team to carry 
> my BFD on SVI request to the DE team for BFD or the product manager. 
> Unfortunately I think I'm throwing pennies into a blackhole.

Nasty. Fibre or copper?

I ask because we're not seeing that on 6500/SXI

The removal of BFD on SVIs is pretty poor.