[j-nsp] IPv6 6to4 tunneling support

[Alex]

> I believe once the RFC has been defined and it became a standard than
> Juniper should go for it.

6to4 is "optional interim mechanism" as per RFC3056.
ISATAP is "Experimental Protocol" as per RFC4214 and status of this RFC is 
EXPERIMENTAL.
So why juniper shall go for RFC3056 if it's optional? Equally, why juniper 
shall go for RFC4214 which is experimental and not standard?
My 2 cents.
Cheers
Alex