Extreme Networks ExtremeWare XOS 11.0, Command Reference Manual

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782 ExtremeWare XOS 11.0 Command Reference Guide
BGP Commands
configure bgp add aggregate-address
configure bgp add aggregate-address {address-family [ipv4-unicast |
ipv4-multicast]} <ipaddress> {as-match | as-set} {summary-only}
{advertise-policy <policy>} {attribute-policy <policy>}
Description
Configures a BGP aggregate route.
Syntax Description
Default
If no address family is specified, IPv4 unicast is the default.
Usage Guidelines
Route aggregation is the process of combining the characteristics of several routes so that they are
advertised as a single route. Aggregation reduces the amount of information that a BGP speaker must
store and exchange with other BGP speakers. Reducing the information that is stored and exchanged
also reduces the size of the routing table.
To use BGP route aggregation, follow these steps:
1 Enable aggregation using the following command:
enable bgp aggregation
2 Create an aggregate route using the following commands:
configure bgp add aggregate-address {address-family [ipv4-unicast |
ipv4-multicast]} <ipaddress> {as-match | as-set} {summary-only} {advertise-policy
<policy>} {attribute-policy <policy>}
Example
The following command configures a BGP aggregate route:
configure bgp add aggregate-address 192.1.1.4/30
address-family The address family. BGP supports two address families: IPv4 Unicast and
IPv4 Multicast.
ipaddress Specifies an IP address and mask.
as-match Generates autonomous system sequence path information (order of AS
numbers in AS_PATH is preserved).
as-set Generates autonomous system set path information (order of AS numbers in
AS_PATH is not preserved).
summary-only Specifies to send only aggregated routes to the neighbors.
advertise-policy Specifies the policy used to select routes for this aggregated route.
attribute-policy Specifies the policy used to set the attributes of the aggregated route.