[c-nsp] max number of iBGP sessions

[Clinton Work]

I don't think you'll run into the limit anytime soon if you use dedicated
RRs
while taking advantage of peer-groups whenever possible. I have seen
dedicated RRs (7206VXR/NPE400)  with roughly 60 IBGP sessions carrying full
Internet BGP routes. The 7206s only work hard when they first bring up all
the IBGP sessions on bootup. Roughly 10 of the 60 IBGP are carrying 100,000+
routes and the rest have between 10-1000 IBGP routes.


> > > I think the number depends more on the numbers of routes it will
> > > handle and the memory u have on the box (and memory free). I have see
using 20 >>> with a  reasonable # of routes  to be a good start.