[c-nsp] Changing ve id doesn't withdraw old prefixes

[Pshem Kowalczyk]

Hi,

It does look like a bug. How often would you change ve id though? I'd
expect that to be fairly static once set up. We had a number of issues
of that sort (Cisco expected the number/id to be static during the
lifetime of a service, but we changed it). Most of those bugs
ultimately got fixed, but in some cases we were told that the
conditions are too unusual, or there is some other workaround.

kind regards
Pshem