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Re: v6 subnet size for DSL & leased line customers
On Mon, 31 Dec 2007 13:18:41 -0800 Joel Jaeggli <[email protected]> wrote: > > Mark Smith wrote: > > > > > Another idea would be to give each non-/48 customer the > > first /56 out of each /48. If you started out with a /30 or /31 RIR block , by > > the time you run out of /48s, you can either start using up the > > subsequent /56s out of the first /48, as it's likely that the first /56 > > customer out of the /48 would have needed the /48 by that time. > > As stated, that approach has really negative implications for the number > of routes you carry in your IGP. > Well, for 120K+ customers, I doubt you're using an IGP for anything much more than BGP loopbacks - and you'd have to be aggregating routes at a higher layer in your routing hierarchy anyway, to cope with 120K routes, regardless of what method you use to dole out /48s or /56s to end-sites. > > Alternatively you might have become more comfortable with giving each > > customer a /48, and wouldn't require any of them to renumber - they'd > > just have to shorten their prefix length. > > > > Regards, > > Mark. > > > -- "Sheep are slow and tasty, and therefore must remain constantly alert." - Bruce Schneier, "Beyond Fear"