[c-nsp] dampening for VPNv4

[Ved Labs]

Thanks Ben for the directions .

I enabled the bgp dampening for VPNv4 address-family .
It helped to some extent to see the flapped statistics from the CE .
I blocked one of the /16 network , which was flapping at a higher rate ,
coming from CE.

Still i do not see significant improvement in the CPU utilisation due to
"BGP router" process.

i can see some changes in prefixes recieved for the VPNv4 route reflector
session.
and there are around 20000 prefixes coming from the VPVv4 RR.
How do i find the culprit

The router is 7206 with NPE-G1 .
Could there be a memory or hardware limilitation also or some bug.

Thanks,
Ved.