filter export (OSPF Area)
Function
The filter export command filters the outgoing Type3 LSAs of the local area.
The undo filter export command restores the default setting.
By default, the outgoing Type3 LSAs of the local area cannot be filtered.
Format
filter { acl-number | acl-name acl-name | ip-prefix ip-prefix-name | route-policy route-policy-name } export
undo filter [ acl-number | acl-name acl-name | ip-prefix ip-prefix-name | route-policy route-policy-name ] export
Parameters
| 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 a named ACL. | The name is a string of 1 to 32 case-sensitive characters. |
| 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 without spaces. |
| route-policy route-policy-name | Specifies the name of a routing policy. | The name is a string of 1 to 40 case-sensitive characters without spaces. |
Usage Guidelines
Usage Scenario
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.
Configuration Impact
After filtering conditions are set for the outgoing summary LSAs to be advertised using the filter export command, only the outgoing Type3 LSAs that pass the filtering can be advertised.
Precautions
- The command can be configured only on an ABR.
- For an ACL, when the rule command is used to configure a filtering rule, the filtering rule takes effective only when the source address range is specified by the source parameter and the time period is specified by the time-range parameter.
- Run the filter import command to set filtering conditions for the incoming Type3 LSAs to be advertised.
