The first table focuses on the current classful routes being passed around by AS and the amount of gain CIDR would give *IF* we could aggregate as the AS level. It shows the number of nets per AS so we see who is announcing what in terms of BGP as well as what the number of CIDR nets would be advertised if we could aggregate at this level... Tony, Interesting. Just wonder if the would CIDR nets (aggregates) of each AS that you composed includes holes or not. E.g. If AS1 has routes 199.1.0 - 199.1.7 except 199.1.3. What CIDR net does it count for this AS in your list: a. 199.1.0/21 (aggregate with hole and reduce routes from 7 to 1) or b. 199.1.0, 199.1.1, 199.1.2 & 199.1.4/22 (without hole and reduce routes from 7 to 4) Basically, I like to know if this reduction of routes on your list (32.6%) is calculated with aggregates with holes or not. If it does not include holes, we should be able to see a MORE reduction of the routing table size by doing the same analysis but include holes in the potential aggregates. --Jessica