using IPv6 address block across multiple locations

Joel jaeggli joelja at
Mon Oct 31 16:01:01 UTC 2011

On 10/31/11 05:59 , Owen DeLong wrote:
> Ideally, you should put a /48 at each location.
> Owen
> On Oct 31, 2011, at 12:56 AM, Dmitry Cherkasov wrote:
>> Hello,
>> Please advice what is the best practice to use IPv6 address block
>> across distributed locations.
>> Recently we obtained our PI /48 from RIPE. The idea was to assign
>> partial slices from this block to different locations (we have
>> currently 3 offices in Europe and 2 in USA). All locations are
>> interconnected with static VPNs. Each location is supposed to
>> establish BGP session with local ISP. Partial prefix /56 + aggregate
>> /48 (with long AS PATH) are to be announced by each office.
>> The problem we ran across is that ISP in US does not wish to accept
>> prefixes longer then /48 from us.
>> Need your advice: is this normal to distribute /48 by /56 parts across
>> locations or should we obtain separate /48 for each of them? Or maybe
>> we need /32 that can be split into multiple /48? Anyway we are not ISP
>> so /48 looks quite reasonable and sufficient for all our needs.

It's not because it can't be de-aggregated further in general. if you
have 5 discreet site you really need at /45. if you can tthe
announcements of the regions to something less specific than a /48 e.g.
a /46  then by all means do so.

>> Thank you.
>> Dmitry Cherkasov

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