The filter-policy import command configures a filtering policy to filter routes received by OSPF.
The undo filter-policy import command restores the default setting.
By default, OSPF does not filter received routes.
filter-policy { acl-number | acl-name acl-name | ip-prefix ip-prefix-name | route-policy route-policy-name [ secondary ] } import
undo filter-policy [ acl-number | acl-name acl-name | ip-prefix ip-prefix-name | route-policy route-policy-name [ secondary ] ] import
| Parameter | Description | Value |
|---|---|---|
| acl-number | Specifies the basic ACL number. | The value is an integer ranging from 2000 to 2999. |
| acl-name acl-name | Specifies the name of a named ACL. | The value is a string of 1 to 64 case-sensitive characters without spaces. The value must start with a letter. |
| ip-prefix ip-prefix-name | Specifies the name of an address prefix list. | The name is a string of 1 to 169 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| route-policy route-policy-name | Specifies the name of the route policy. | The name is a string of 1 to 40 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| secondary | Selects a secondary route. | - |
Usage Scenario
The filter-policy import command is used to set a filtering policy for received routes. Only the routes that pass the filtering can be added to the routing table. The routes that fail to pass the filtering cannot be added to the routing table but can be advertised.
The OSPF routing information is recorded in the LSDB. Instead of filtering the received or sent LSAs, the device filters routes calculated by OSPF using the filter-policy import command.
Precautions
For an ACL configured using the acl command, when the rule command is used to configure a filtering rule, the filtering rule takes effect only when the source address range is specified by the source parameter and the time period is specified by the time-range parameter.
Creating an ACL before it is referenced is recommended. If a nonexistent ACL is referenced using the command, all routes received by OSPF are delivered to the IP routing table.
Creating an IP prefix list or route-policy before it is referenced is recommended. By default, nonexistent IP prefix lists or route-policies cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent IP prefix list or route-policy is referenced using the current command, all routes received by OSPF are delivered to the IP routing table.