Re: An idea: GxSE

[Ben Black <ben@layer8.net>]

On Tue, Jun 26, 2001 at 01:22:20PM -0500, Jon (Taz) Mischo wrote:
> > Given the hop by hop nature of IP, I suspect it will be rather difficult
> > to have the translations occur anywhere but at the border.
> 
> Not at all.  As I explained in a previous post, having the valid GR/SK
> pairs announced in BGP or the like and propagating them through the
> internal network via an IGP or a proptocols specifically designed for this
> purpose would let you translate in the distribution layer or even access
> layer (although in most cases the distribution layer routers would be the
> ones beefy enough to handle it of the two).
> 

This doesn't address the concern I noted above which is that the interior
routers simply don't know the egress router, and hence the egress prefix
(assuming you always map into space provided by a given upstream, which
is how I would expect to avoid rapid table growth).  This information
_could_ be communicated to the interior routers, but it would require them
to carry full reachability information, which seems a rather onerous
requirement.


Ben

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