[c-nsp] BGP Route Reflector Case

[Curtis Piehler]

This is more of a design question but looking to implement on IOS-XR if
it's possible.  Can a router act as a dual purpose route reflector?  What I
mean by that, can it serve the purpose of both a local market route
reflector and regional route reflector?  Basically having to peer a bunch
of local market route reflectors does not scale hence the need for a
regional or 2nd level route reflectors at the top.  Local market route
reflectors do solve the issue of sub-optimal routing from a local market
perspective.