H3C Technologies H3C S7500E Series Switches - Manual (Page 101)

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z For details about IP prefix list, see Route Policy Configuration in the Layer 3 - IP Routing
Configuration Guide.
z For details about route policy, see Route Policy Configuration in the Layer 3 - IP Routing
Configuration Guide.
Since OSPF is a link state-based interior gateway protocol, routing information is contained in LSAs.
Routes computed by OSPF can be filtered and only permitted routes are installed into the routing
table.
There are four filtering methods:
z Filtering routing information by destination address through ACLs and IP address prefixes.
z Filtering routing information by next hop through the filtering criteria configured with the gateway
keyword.
z Filtering routing information by destination address through ACLs and IP address prefixes and by
next hop through the filtering criteria configured with the gateway keyword.
z Filtering routing information by route policies 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 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
This task is configured on an ABR to filter Type-3 LSAs to be advertised in the attached non-backbone
area and the Type-3 LSAs to be advertised to other areas.
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 instance-name ] *
—