OSPF Configuration 147
Configuring OSPF to Filter the Received Routes
Configuring OSPF to filter the distributed routes
By default, OSPF will not filter the imported and distributed routing information.
■ 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 to 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.
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 155 Enabling OSPF to filter the received routes
Operation Command
Disable to filter the received global
routing information
filter-policy {
acl_number
| ip-prefix
ip_prefix_name
| gateway
ip_prefix_name
} import
Cancel to filter the received global
routing information
undo filter-policy {
acl_number
|
ip-prefix
ip_prefix_name
| gateway
ip_prefix_name
} import
Table 156 Enabling OSPF to filter the distributed routes
Operation Command
Enable OSPF to filter the distributed
routes
filter-policy {
acl_number
| ip-prefix
ip_prefix_name
} export [
routing_
process
]
Disable OSPF to filter the distributed
routes
undo filter-policy {
acl_number
|
ip-prefix
ip_prefix_name
} export [
routing_process
]
Tab le 157 Configuring the Filling of the MTU Field when an Interface Transmits DD
Packets
Operation Command
Enable an interface to fill in the MTU field when
transmitting DD packets
ospf mtu-enable
Disable the interface to fill MTU when transmitting DD
packets
undo ospf mtu-enable
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