Re: V4 via V6 and IGP routing protocols

[Masataka Ohta <mohta () necom830 hpcl titech ac jp>]

Dave Taht wrote:

> > Are MPLS or SR too heavy a bat?
>
> MPLS was not an option at the time. It might become one.

MPLS with nested labels, which is claimed to scale because
nesting represents route hierarchy, just does not scale because
source hosts are required to provide nested labels, which
means the source hosts have the current most routing table at
destinations, which requires flat routing without hierarchy or on
demand, that is, flow driven, look up of detailed routing tables
of destinations at a distance.

                                        Masataka Ohta