L2VPN is not progress. It's the opposite.
users do want ways to bridge a layer two lan across the internet.
and this seems a legitimate desire that should be doable without
breaking anything. of course, this will drift into areas where we
know large l2 networks have problems. but, if properly done, that
should not affect the internet across which the lans are bridged.
otoh, those kinds of l2 issues and others should make us very
cautious when evaluating schemes to make the transforming the
internet core into an l2 circuit network.
randy