IPv6 prefix lengths

ML ml at kenweb.org
Wed Jan 12 21:54:23 CST 2011

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??

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