3Com SuperStack 4 Configuration Manual page 135

Configuring OSPF to Filter the Received Routes
Table 155 Enabling OSPF to filter the received routes
Operation
Disable to filter the received global
routing information
Cancel to filter the received global
routing information
Configuring OSPF to filter the distributed routes
Table 156 Enabling OSPF to filter the distributed routes
Operation
Enable OSPF to filter the distributed
routes
Disable OSPF to filter the distributed
routes
By default, OSPF will not filter the imported and distributed routing information.
The
■ filter-policy import
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
imported by the
import-route
only the
filter-policy export
command to import other external routes (including OSPF
import-route
routes of different process), then the
not take effect.
Configuring the Filling of the MTU Field When an Interface Transmits DD
Packets
OSPF-running routers use the DD (Database Description) packets to describe their
own LSDBs when synchronizing the databases.
You can manually specify an interface to fill in the MTU field in a DD packet when
it transmits the packet. The MTU should be set to the real MTU on the interface.
Perform the following configuration in Interface View:
Table 157 Configuring the Filling of the MTU Field when an Interface Transmits DD
Packets
Operation
Enable an interface to fill in the MTU field when
transmitting DD packets
Disable the interface to fill MTU when transmitting DD
packets
Command
filter-policy { acl_number
ip_prefix_name | gateway
} import
undo filter-policy {
ip-prefix ip_prefix_name
ip_prefix_name } import
Command
acl_number
filter-policy {
ip_prefix_name
} export [
process
]
undo filter-policy {
ip_prefix_name
ip-prefix
routing_process
]
command only filters the OSPF routes of this
command only takes effect to the routes
command. If you configure the Switch with
command, but without configuring the
filter-policy export
Command
ospf mtu-enable
undo ospf mtu-enable
OSPF Configuration 147
| ip-prefix
ip_prefix_name
acl_number |
| gateway
| ip-prefix
routing_
acl_number
|
} export [
command does