[c-nsp] Question about BGP MRAI on Cisco

[Oliver Boehmer (oboehmer)]

> 
> I know that Juniper doesn't do MRAI, so it sends all new updates
> immediately out. 
> Cisco, according to some doc's does 30 sec over EBGP and 5 sec over
> IBGP sessions. 
> 
> The question:
> 
> Does MRAI work on first update or only on the next ones ?
> In other words when a BGP router gets new update will it wait until
> MRAI timer expires (different for EBGP and IBGP) 
> or will it send this update (after it's placed in Adj-RIBs-Out)
> immediately out and apply MRAI timer to the next similar update. 

IOS implements a timer per neighbor (not by prefix), and we start the
timer when we're done sending the initial updates to a neighbor (i.e.
after it has come up initially). All subsequent updates are subject to
this timer.

	oli