The filter-policy import command configures a filtering policy to filter the 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 import
filter-policy { acl-name acl-name | ip-prefix ip-prefix-name | { route-policy route-policy-name | route-filter route-filter-name } [ secondary ] } import
undo filter-policy [ acl-number | acl-name acl-name | ip-prefix ip-prefix-name | { route-policy route-policy-name | route-filter route-filter-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 basic ACL. |
The value is a string of 1 to 64 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive). |
| ip-prefix ip-prefix-name |
Specifies the name of an IP 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 a route-policy. |
The name is a string of 1 to 200 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| route-filter route-filter-name |
Specifies the name of route filter policy. |
The value is a string of 1 to 200 case-sensitive characters, spaces not supported. If parameters are included in the referenced route-filter, specify values for them in the format of (var1, var2, ...var8) behind the route-filter name. A maximum of eight parameters can be specified, and each value ranges from 1 to 200 characters. |
| secondary |
Indicates the secondary route. |
- |
Usage Scenario
After the filter-policy import command is run, only the routes that pass the filtering can be added to the routing information base (RIB) and advertised. Therefore, the device does not advertise Summary-LSAs, AS-External-LSAs, or NSSA LSAs to other areas or processes. OSPF is a link-state dynamic routing protocol, with routing information carried in link status advertisements (LSAs). Therefore, the filter-policy import command cannot be used to filter the advertised or received LSAs. This command is used to filter the routes calculated by OSPF, and only the matched routes can be added to the RIB.
Precautions
When the rule command is used to configure a filtering rule for a named ACL, only the source address range that is specified in source and the time period that is specified in time-range take effect on the filtering rule.