H3C Technologies H3C S10500 Series Switches - Manual (Page 99)

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OSPF provides the following filtering methods:
• Filters routing information by destination address through ACLs and IP address prefixes
• Filters routing information by next hop through the filtering criteria configured with the gateway
keyword
• Filters routing information by destination address through ACLs and IP address prefixes and by next
hop through the filtering criteria configured with the gateway keyword
• Filters routing information by routing policy specified by the route-policy keyword
Follow these steps to configure inbound route filtering:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
—
Configure inbound route
filtering
filter-policy { acl-number [ gateway
ip-prefix-name ] | gateway ip-prefix-name |
ip-prefix ip-prefix-name [ gateway
ip-prefix-name ] | route-policy
route-policy-name } import
Required
Not configured by default.
Configuring ABR Type-3 LSA filtering
You can configure an ABR to filter Type-3 LSAs advertised to an area.
Follow these steps to configure Type-3 LSA filtering on an ABR:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
—
Enter area view area area-id —
Configure ABR Type-3 LSA filtering
filter { acl-number | ip-prefix
ip-prefix-name } { import | export }
Required
Not configured by
default.
Configuring an OSPF cost for an interface
You can configure an OSPF cost for an interface by using either of the following methods:
• Configure the cost value in interface view
• Configure a bandwidth reference value for the interface. OSPF computes the cost with this formula:
Interface OSPF cost = Bandwidth reference value (100 Mbps) ÷ Interface bandwidth (Mbps). If the
calculated cost is greater than 65535, the value of 65535 is used. If the calculated cost is less than
1, the value of 1 is used.
If the cost value is not configured for an interface, OSPF computes the interface cost automatically.
Follow these steps to configure an OSPF cost for an interface: