Re: The Cidr Report

["Sean M. Doran" <smd () clock org>]

| > B/      When we can easily do:
| > 
| >     "router bgp N
| >          proxy-aggregate route-map Lazy-Types
|
| I may be misunderstanding, but does this (proposed) config statement
| automaticly suppress (aggregate) any prefixes that are exactly the
| same as another prefix except in the length? For example given
|
| 128.8.0.0/16
| 128.8.0.0/24
| 128.8.1.0/24
|
| the last two would not be propogated? That would be cool!

Right, essentially.  This is particularly easy if all the
attributes are the same, notably the AS_Path.

In IOS there is already a pretty good set of tools to choose what
one proxy-aggregates -- and how -- that were developed several
years ago; a tool to choose when to apply a set of these would also
be useful.

One policy that I think would be useful would be: "Does the origin
AS announce more than N prefixes?  If so, aggregate/drop more specifics
as follows..." 

        Sean.