[c-nsp] WS-X6748-SFP support

[Chris Knipe]

Thanks for all the chip in guys :-)

Did read quite a bit about them on Cisco - just wanted to make sure / get
some real life confirmations.

Sup2T/6T may be beneficial (later) for 10G uplinks (which is -E only as far
as I read/understand), but shouldn't be required for a while - at least not
until traffic levels pick up.  So that, with the vpls PE limitation may
very well be points to consider yes, and may just throw me to the -E
chassis. DDM would be nice, but I think I can live without that for now.

--
Chris