Re: [Softwires] MAP-E question -- first prefix

[Ole Troan <[e-mail]>]

Tom,

> OK, how about this for the complete paragraph:
> 
>   "By default, the MAP subnetwork identifier is the first subnetwork within the End-user IPv6 prefix (all bits set to zero). An alternative subnetwork value MAY be configured. All nodes within a MAP domain MUST be configured to use the same value of the subnetwork identifier."

I like that text.

> I think that captures the intent. However, I see a possible difficulty: differing lengths of the End-user IPv6 prefix for different CEs. We have to add two conditions:
> 
> -- the configured subnetwork identifier is at least
>            64 - min (n + o)
> bits long, where the minimization is taken over all FMRs in the domain
> 
> -- the subnetwork identifier used with a given calculated End-user IPv6 prefix uses the right-most (64 - (n + o)) bits of the configured subnetwork identifier, where (n + o) is taken from the FMR used for the calculation.
> 
> Seems simpler just to restrict to the all-zeros value, but please comment.

I can't see how different End-user IPv6 prefix lengths within a domain can work.

cheers,
Ole