Operation Manual - Routing Protocol
Quidway S3500 Series Ethernet Switches Chapter 4 OSPF Configuration
Huawei Technologies Proprietary
4-22
 Note:
z The filter-policy import command only filters the OSPF routes of this process
received from the neighbors, and routes that cannot pass the filter won’t be added to
the routing table. This command only takes effect on ABR.
z 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.
4.2.26 Configuring to Fill 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 4-27 Configuring Whether the MTU Field will be Filled in 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
By default, the interface does not fill in the MTU field when transmitting DD packets. In
other words, MTU in the DD packets is 0.
4.2.27 Disabling the Interface to Send OSPF Packets
To prevent OSPF routing information from being acquired by the routers on a certain
network, use the silent-interface command to disable the interface to transmit OSPF
packets.
Perform the following configuration in OSPF view.
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