Aggregate routes

Aggregating routes conserves router resources and accelerates best patch calculation by reducing the size of the table. The two methods for BGP route aggregation are:
  • Static: Create a static reject route for the prefix and advertise the network through a network command. The disadvantage of this method is that the summary route will always be advertised even if the networks are not available.

  • Dynamic: Configure an aggregation network range using the aggregate-address command. When viable routes that match the network range enter the BGP table, an aggregate route is created. On the originating router, a reject route for the aggregated prefix is automatically created by BGP as a loop-prevention mechanism.