Summarising eBGP only

[JollyJohn]

I have a customer who uses BGP and has a number of small sites, each of which has 4 devices (2xCisco & 2xFortigate) in a single AS. These devices need to share all the route information within their ASN as not all networks at the site are connected to all devices. However, I want to summarise the routes that go out of the site, so from the outside, you see a simpler single address for the site. What is the best way to apply route summarization that only summarises eBGP and still send all the routes via iBGP? I keep tracking through the documents and going in circles about the best way to implement it. Suggestions please.

[emnoc]

Have you played with aggregator 

e.g ( cli under config router bgp )

config aggregate-address   edit 1        set prefix  10.10.0.0 255.255.0.0        set summary enable  end So 10.10.0.0/16  would be the summary route inject  Ken Felix