[c-nsp] bgp slow prefix learning

[Jason LeBlanc]

I'm wondering if I have something that is by design or if something else 
is slowing my routers down.  I have two 2811s with 768 megs running 
12.4(4)T3, each connected to different upstreams via fast ethernet.  I'm 
using prefix lists to limit them to /22, but I should have enough ram 
for a full /24 view.  My problem is that anytime I clear a neighbor it 
takes them hours to learn all the prefixes again, which has forced me to 
add static defaults to compensate.  My cpu is 2-4% during this, so I 
can't see how its cpu bound.  Anyone have any ideas?

Thanks,
Jason