3Com Switch 8800 Family Configuration Guide

318 CHAPTER 31: OSPF CONFIGURATION
By default, OSPF does not receive the routes advertised by other routing protocols.
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■ The filter-policy import command only filters the OSPF routes of this process
received from the neighbors, and routes that cannot pass the filter will not be
added to the routing table. This command only takes effect on ABR.
■ The filter-policy export command only takes effect on the routes imported by
the import-route command. If you configure the switch with only the
filter-policy export command, but without configuring the import-route
command to import other external routes (including OSPF routes of different
process), then the filter-policy export command does not take effect.
■ If the filter-policy export command does not specify which type of route is to
be filtered, it takes effect on all routes imported by the local device using the
import-route command.
Configuring filtering of received Type-3 LSAs
Use the following command to configure route filtering between OSPF areas.
By default, the OSPF area does not filter received Type-3 LSAs.
Configuring filtering of Type-3 LSAs advertised to other areas
By default, an OSPF area does not filter Type-3 LSAs advertised to other areas.
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The filter-policy import/export command filters only locally originated Type-3
LSAs, and does not filter Type-3 LSAs received from neighbors. This command is
valid on ABR only.
Tabl e 280 Enable OSPF to filter the imported routes of other routing protocols
Operation Command
Enable OSPF to filter the routes advertised by
other routing protocols
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ routing-protocol ]
Disable OSPF to filter the advertised routes by
other routing protocols
undo filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ routing-protocol ]
Tabl e 281 Configure filtering of received Type-3 LSAs
Operation Command
Enable an OSPF area to filter received Type-3
LSAs
filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Disable an OSPF area from filtering received
Type-3 LSAs
undo filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Tabl e 282 Configure filtering of Type-3 LSAs advertised to other areas
Operation Command
Enable an OSPF area to filter Type-3 LSAs
advertised to other areas
filter-policy { acl-number | ip-prefix
ip-prefix-name } export
Disable an OSPF area from filtering Type-3
LSAs advertised to other areas
undo filter-policy { acl-number | ip-prefix
ip-prefix-name } export