[c-nsp] IPv6 Subnetting - Service Provider

[Justin M. Streiner]

On Thu, 11 Sep 2008, Paul Stewart wrote:

> In a SP environment, what's common practice so far with subnetting?
> Typically, in IPv4 today we use a /30 or /29 for point to point and each
> device has a /32 loopback...
>
> I've been reading a lot of different opinions and everyone seems to
> recommend a /64 for each link (router) or a server - why so large?  I'd love
> to see a layout of a few routers in a SP core network and how they've
> subnetted them....;)

This debate rolled on NANOG a few weeks ago.  People generally broke into
two camps - one advocated using /64s on point-to-point links, and the other
advocated smaller subnets such as /126 for point-to-points and /128s for
loopbacks.  So, I guess the consensus is that there isn't one :)

jms