Hi Dino,
|If you put xTRs at the PE, they will never talk to each other when
|deployed in different SPs. And you want them to know about each
|other's reachability so they can set loc-reach-bits for themselves as
|well as each other. That has to happen at the site. Plus it scales
|better there.
This doesn't follow. One could, for example, have a protocol or
configuration on the xTRs that establishes reachability (from the
site side)
of each of the xTRs. If there was an agent on the site that
coordinated
this actively, it would only result in customer-provider
interactions, which
could reasonably scale.