2013-02-11 23:51, Usman Latif <[email protected]> :
> Hi Remi,
>
>
>
> On 11/02/2013, at 9:13 PM, Rémi Després <[email protected]>
>> ...
>>> So if I understand it correctly, if a PE-CE link already has a /127 prefix
>>> assigned to it- and we wanted to use the CE as a 4rd CE, we'll have to
>>> assign an additional IPv6 prefix to the CE with 64-bit IIDs?
>>>
>>> Pls share little detail with me in a scenario where a SP already has /127
>>> with CEs and 4rd is needed from the CE
>>
>> According to RFC 6164, /127 prefixes are used ONLY on inter-router link.
>> They cannot be used as customer-site IPv6 prefixes which, to comply with
>> https://tools.ietf.org/html/rfc4291#section-2.5.1, MUST permit 64-bit IIDs.
>>
>> Each 4rd CE MUST therefore be delegated at least one IPv6 prefix having at
>> most 64 bits (this doesn't depend on its WAN link having or not a /127).
>>
>> RD
>
>
> Yes 6164 is only for inter-router links
> I was under the impression that 4rd CE might use the WAN IPv6 address for
> stateless tunnelling of IPv4 inside IPv6
> Maybe this was a misunderstanding(?)
In the 4rd specification, CE IPv6 prefixes are at most /64.
See Figure 5 in particular:
+----------+---+-+-+------+---+ +--------------+-+-+------+---+
|CE v6 prfx| 0 |V|0|v4 add|CNP| |BR IPv6 prefix|V|0|v4 add|CNP|
+----------+-|-+-+-|+-----+---+ +--------------+-+-+------+---+
: =<64 : | :8:8: 32 :16 : : 64 :8:8: 32 :16 :
|
Padding to /64
RD
> Or is it really upto the operator whether he wants to leverage the CE WAN
> IPv6 prefix or the allocated IPv6 prefix routed to the CE site
> If the CE WAN happens to be a /64 prefix, could the 4rd leverage that?
> What is the recommendation there
>
>
> Regards,
> Usman
>
>
>
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