3Com Switch 8800 Family Configuration Guide

374 CHAPTER 33: BGP CONFIGURATION
■ Automatic aggregation (by means of the summary command): The
aggregation of IGP subnet routes imported by the BGP. With automatic
aggregation enabled, the BGP will not receive subnet routes imported from the
IGP, and routes on natural network segments will be aggregated;
■ Manual aggregation (by means of the aggregate command): The aggregation
of the BGP local routes. In general, the preference of manual aggregation is
higher than that of automatic aggregation.
Perform the following configuration in BGP view.
By default, the BGP does not perform local route aggregation.
Configuring BGP Route
Filtering
Configuring BGP to filter the received route information
The routes received by the BGP can be filtered, and only those routes that meet
the certain conditions will be received by the BGP.
Perform the following configuration in BGP view.
By default, the BGP does not filter the received routes.
Configuring to filter the routes advertised by other protocols
Perform the following configuration in the BGP view.
Tabl e 372 Configure BGP route aggregation
Operation Command
Enable automatic aggregation
of subnet routes
summary
Disable automatic aggregation
of subnet routes
undo summary
Enable local route aggregation
aggregate address mask [ as-set | attribute-policy
route-policy-name | detail-suppressed | origin-policy
route-policy-name | suppress-policy route-policy-name ]*
Disable local route aggregation
undo aggregate address mask [ as-set | attribute-policy
route-policy-name | detail-suppressed | origin-policy
route-policy-name | suppress-policy route-policy-name ]*
Tabl e 373 Configure imported route filtering
Operation Command
Filter received routing information advertised
by specified address
filter-policy gateway ip-prefix-name import
Disable filtering of received routing
information advertised by specified address
undo filter-policy gateway ip-prefix-name
import
Filter received global routing information
filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Disable filtering of received global routings
information
undo filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Tabl e 374 Configure to filter the routes advertised by other routing protocols
Operation Command
Configure to filter the routes advertised by
other routing protocols
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ routing-protocol ]