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 are not 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 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 routing 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.

Views

OSPF area view

Default Level

2: Configuration level

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.
Creating an ACL before it is referenced is recommended. If a nonexistent ACL is referenced using the command, OSPF advertises 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 advertises all Type 3 LSAs.

Example

# Configure OSPF to filter outgoing Type 3 LSAs.

<HUAWEI> system-view

[HUAWEI] ospf 1

[HUAWEI-ospf-1] area 1

[HUAWEI-ospf-1-area-0.0.0.1] filter 2000 export