The filter import command filters the incoming Type3 LSAs of the local area.
The undo filter import command restores the default setting.
By default, the incoming Type3 LSAs are not filtered.
filter { acl-number | acl-name acl-name | ip-prefix ip-prefix-name | route-policy route-policy-name } import
undo filter [ acl-number | acl-name acl-name | ip-prefix ip-prefix-name | route-policy route-policy-name ] import
| Parameter | Description | Value |
|---|---|---|
acl-number |
Specifies the number of a basic ACL. |
The value is an integer ranging from 2000 to 2999. |
acl-name acl-name |
Specifies the name of an 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 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 40 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
Usage Scenario
After filtering conditions are set for the incoming summary LSAs to be advertised using the filter import command, only the incoming Type3 LSAs that pass the filtering can be received.
Configuration Impact
The command can be used to filter out invalid LSAs sent to neighbors to reduce the size of the LSDB and speed up network convergence.
Precautions
Creating an ACL before it is referenced is recommended. If a nonexistent ACL is referenced using the command, OSPF receives all Type 3 LSAs.
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, OSPF receives all Type 3 LSAs.
Creating a route-policy before it is referenced is recommended. By default, nonexistent 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 route-policy is referenced using the current command, all the routes learned by the specified protocol are imported to the OSPF routing table.