> i propose a 5th solution which is:
>
> - topology advertisements are distributed/flooded in a loop
> free manner
> - routing decisions are NOT SPECIFIED. in the common case the
> authoritative domain makes the final decision with all of the
> topology information ( = easy loop freedom!)-- above are similar to the matrix appraoch
> - requests that are routed to another CDN must not be
> routed further (ie. restricted two-level hierarchy)-- this is option 1
I think we can accomodate both easily... the third bullet
above is simply a policy/administration issue
-brad