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BGP and BGP4+ Introduction
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
1.28 AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 C613-50032-01 REV D
BGP and BGP4+ Aggregate Addresses
CIDR (Classless Inter-Domain Routing) enables you to create aggregate routes to minimize
the size of routing tables. CIDR is a routing method supported by BGP and BGP4+ that is
based on route aggregation. CIDR allows a router to group routes together to minimize
the amount of routing information carried. Several IP networks appear as a single network
to networks outside of those grouped together
You can configure aggregate routes in BGP or BGP4+ either by redistributing an aggregate
route into BGP or BGP4+ or by using the BGP and BGP4+ Aggregation feature. An
aggregate address is added to the BGP table if at least one entry is in the BGP table.
To create an IPv4 aggregate address in the BGP routing table, use the following command
in the Router Configuration mode:
To create an IPv6 aggregate address in the BGP4+ routing table, use the following
command in the Address Family Configuration mode:
How to enable and disable Automatic
Summarization
When a subnet is redistributed from an IGP to BGP, network routes are added to routing
tables. By default, automatic summarization is disabled. To enable automatic network
number summarization, use the following command in Router Configuration mode:
To disable automatic network number summarization, use the following command in
Router Configuration mode:
awplus(config-router)#
aggregate-address <ip-addr/m>
{summary-only|as-set}
This command creates an aggregate IPv4 route entry in the BGP
routing table. This entry will cause BGP to advertise IPv4
summary addresses only, if the summary-only parameter is
applied. This entry will cause BGP to generate autonomous
system set path information, if the the as-set parameter is
applied.
awplus(config-router-af)#
aggregate-address <ipv6-addr/
prefix-length> {summary-only|
as-set}
This command creates an aggregate IPv6 route entry in the
BGP4+ routing table. This entry will cause BGP4+ to advertise
IPv6 summary addresses only, if the summary-only parameter
is applied. This entry will cause BGP4+ to generate autonomous
system set path information, if the the as-set parameter is
applied.
awplus(config-router)#
auto-summary
This command enables automatic network summarization.
awplus(config-router)#
no auto-summary
This command disables automatic network summarization.