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Alteon OS Application Guide
178
Chapter 11: Border Gateway Protocol 42C4911, January 2007
Aggregating Routes
Aggregation is the process of combining several different routes in such a way that a single
route can be advertised, which minimizes the size of the routing table. You can configure
aggregate routes in BGP either by redistributing an aggregate route into BGP or by creating an
aggregate entry in the BGP routing table.
When a subnet is redistributed from an Interior Gateway Protocol (IGP) into BGP, only the
network route is injected into the BGP table. By default, this automatic summarization is dis-
abled. To define the route to aggregate, use the following commands:
An example of creating a BGP aggregate route is shown in “Default Redistribution and Route
Aggregation Example” on page 185.
>> # cfg/l3/bgp (Specify BGP)
>> Border Gateway Protocol#
aggr 1 (Specify aggregate list number)
>> BGP aggr 1 #
addr (Enter aggregation network address)
>> BGP aggr 1 #
mask (Enter aggregation network mask)
>> BGP aggr 1 #
ena (Enable aggregation)