[RAM] Number of DFZ routers

Can anyone provide an estimate for the number of routers in
the DFZ?

  Transit routers  (DFZ)

  Multihomed border routers  (DFZ)

  Singlehomed border routers

Can anyone suggest the range of number of interfaces these
routers have?  For instance, what is the largest number of
interfaces on an operational router?

What would be a typical range of interface numbers for
transit routers?

In addition to direct forwarding of Internet traffic, and
handling the communications paths between the routers
themselves, do transit routers often perform other functions,
such as handling MPLS?

I would also be curious about typical transit router models and
interface speeds.

Please respond off-list if this is too off-topic.

  - Robin

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