[rrg] a quick critique on 2-phased mapping

[Lixia Zhang <lixia at cs.ucla.edu>]

This is a simple idea on how to scale mapping. However personally I  
feel the design is too incomplete to be considered a serious input to  
RRG. Take the following 2 issues as example:

First, in this 2-phase scheme, an AS is essentially the unit of  
destinations (i.e. sending ITRs find out destination AS D, then send  
data to one of of D's ETR).  This does not offer much choice for  
traffic engineering.

Second, there is no consideration whatsoever on failure detection and  
handling.

Lixia