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Re: IPv6 /48 advertisements
From: Edward Dore <edward.dore () freethought-internet co uk>
Date: Wed, 18 Dec 2013 16:22:20 +0000

If you’re talking about announcing each location separately, then RIPE have a couple of useful articles about prefix 
visibility on Ripe Labs:


Otherwise I guess you’ll need to talk to your chosen carrier(s) about aggregating your space for you, which will come 
down to their policies on what routes they will carry internally.

Edward Dore 
Freethought Internet 

On 18 Dec 2013, at 16:11, Cliff Bowles <cliff.bowles () apollogrp edu> wrote:

I accidentally sent this to nanog-request yesterday. I could use some feedback from anyone that can help, please.

Question: will carriers accept IPv6 advertisements smaller than /48?

Our org was approved a /36 based on number of locations. The bulk of those IPs will be in the data centers. As we 
were chopping up the address space, it was determined that the remote campus locations would be fine with a /60 per 
site. (16 networks of /64). There are usually less than 50 people at the majority of these locations and only about 
10 different functional VLANs (Voice, Data, Local Services, Wireless, Guest Wireless, etc...).

Now, there has been talk about putting an internet link in every campus rather than back hauling it all to the data 
centers via MPLS. However, if we do this, then would we need a /48 per campus? That is massively wasteful, at 65,536 
networks per location.  Is the /48 requirement set in stone? Will any carriers consider longer prefixes?

I know some people are always saying that the old mentality of conserving space needs to go away, but I was bitten by 
that IPv4 issue back in the day and have done a few VLSM network overhauls. I'd rather not massively allocate unless 
it's a requirement.

Thanks in advance.


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