On Jan 29, 2004, at 3:45 PM, Hallam-Baker, Phillip wrote:
One of the things that has consistently failed in the traditional
legacy
infrastructure has been upgrading old protocols.
I look to the BITNET model here. The two protocols don't cleanly
interoperate, but work via gateways.
The incentive to upgrade comes from, among other things, gateways
increasingly adding artificial delays into gateway transfers, reducing
the immediacy of delivery, and eventually decomissioning, forcing the
issue. You allow for the transition, but you don't allow it to carry
forward forever.
Of course, it's unlikely we'd be able to finish the migration until
after IPV6 is complete.