[c-nsp] max routes on 76K platform

[Jon Lewis]

As we inch closer and closer to the Sup2 no longer being able to handle 
"full routes", I'm wondering, is there or will there be an upgrade path 
for 6500/7600's other than Sup720-3bxl (or whatever comes after that) to 
support >256K routes?  It seems like with the right PFC, the Sup32 would, 
but from what I've read, the Sup32 only has a PFC3B (not the 3BXL), which 
I suspect still limits it to <256K routes.

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  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                |
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