The purpose of a Route Server is to centralize the peerings between BGP speakers. For example if we have an exchange point scenario with four BGP speakers, each of which maintaining a BGP peering with the other three (see fig:full-mesh), we can convert it into a centralized scenario where each of the four establishes a single BGP peering against the Route Server (see fig:route-server).
We will first describe briefly the Route Server model implemented by Frr. We will explain the commands that have been added for configuring that model. And finally we will show a full example of Frr configured as Route Server.