IPv6 prefix lengths

Mark Andrews marka at isc.org
Wed Jan 12 22:01:13 CST 2011


In message <4D2E776F.2080400 at kenweb.org>, ML writes:
> On 1/12/2011 10:49 PM, Richard Barnes wrote:
> > Hi all,
> >
> > What IPv6 prefix lengths are people accepting in BGP from
> > peers/customers?  My employer just got a /48 allocation from ARIN, and
> > we're trying to figure out how to support multiple end sites out of
> > this (probably around 10).  I was thinking about assigning a /56 per
> > site, but looking at the BGP table stats on potaroo.net [1], it looks
> > like this is not too common (only .29% of prefixes).  Thoughts?
> >
> > Thanks,
> > --Richard
> >
> >
> > [1]<http://bgp.potaroo.net/v6/as2.0/index.html>
> >
> 
> Are you talking about assigning /56s per POP, enterprise site?
> 
> If /56s are just in your iBGP..shouldn't be a problem.  You're going to 
> aggregate and just announce your /48 to your eBGP peers, yes??

If there are multiple indendent end sites then get a /48 for each of them.
A /48 is for a SITE not a ENTERPRISE.
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org




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