The Cidr Report

Tli asked:

> Exercise for the reader: If prefixes of length F and longer are filtered,
> and a domain has a prefix of length N, how many prefixes can they propagate
> into the backbone? How many before people start proxy aggregating them?

A/ (2 ** F) - 1. [assuming nobody imposes exact-match prefix filters]

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

the last two would not be propogated? That would be cool!