Gang,

I think there was some confusion about VA during the talk today, and I 
wanted to clear some things up:

1.  VA does not require any new hardware.  An "Aggregation Point Router" 
is a normal router that just happens to be an aggregation point for one or 
more virtual prefixes.
2.  No router FIB need carry the entire DFZ.  In our tier-1 ISP study, ALL 
routers saw 10x FIB reduction or more, NO routers saw more than a few 
percent load increase.

The basic trade-off that VA offers to an ISP is whether to change out 
hardware or to increase the amount of config it has to do.  I wouldn't 
want to presuppose that no ISP would prefer to increase config over change 
out hardware.

PF

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