[c-nsp] ipv6 subnetting

[Alan Buxey]

Hi,

> Most important: follow the aggregation points in your network, and do strong
> and multi-level aggregation.  You do not want to have 4 billion /64 in your 
> internal routing.

yep - use this opportunity to sort out and fix aggregation - an IPv6 addressing
scheme will cure many future headaches and undo all of those nasty fragmented v4 space 
issues you've dealt with over the ast decades as the network has increased.

alan