3Com 3C13636 Configuration Manual page 612

3Com Router 3000 Ethernet Family
Configuration Guide
I. Configuring OSPF to filter received routes
After OSPF receives LSAs, it may decide based on certain filtering conditions whether
to add the computed routes to the routing table. The routes filtered out do not appear in
the local routing table.
Table 4-11 Configure OSPF to filter the redistributed routes
Configure OSPF to filter received global
routing information
Disable OSPF to filter received global
routing information
Note:
The filter-policy import command only filters the OSPF routes of this process
received from neighbors. Even though it blocks routing information from being added to
the routing table, it does not prevent the corresponding LSAs from being advertised.
This command only takes effect on ASBRs.
II. Configuring OSPF to filter redistributed routes
The filter-policy export command is configured on an ASBR to filter the redistributed
external routes of OSPF, that is, to filter the LSAs of redistributed routes to be
advertised. The routes filtered out are not to be advertised as Type-5 LSAs. This
command is available on ASBRs only.
Table 4-12 Configure OSPF to filter redistributed routes
Enable OSPF to filter the LSAs of
redistributed routes for advertisement
Disable OSPF to filter the LSAs of
redistributed routes for advertisement
By default, OSPF does not filter redistributed or advertised routing information.
Operation
Operation
3Com Corporation
4-17
Chapter 4 OSPF Configuration
Command
filter-policy { acl-number | ip-prefix
ip-prefix-name | gateway prefix-list-
name } import
undo filter-policy
ip-prefix ip-prefix-name
ip-prefix-name } import
Command
filter-policy { acl-number | ip-prefix
ip-prefix-name
[ routing-process ]
undo filter-policy
ip-prefix ip-prefix-name
[ routing-process ]
{ acl-number |
| gateway
} export
{ acl-number |
} export