ospf filter-lsa-out
Function
The ospf filter-lsa-out command configures the specified interface enabled with OSPF to filter outgoing LSAs.
The undo ospf filter-lsa-out command configures a wireless access controller not to filter outgoing LSAs.
By default, outgoing LSAs are not filtered.
Format
ospf filter-lsa-out { all | { summary [ acl { acl-number | acl-name } ] | ase [ acl { acl-number | acl-name } ] | nssa [ acl { acl-number | acl-name } ] } * }
undo ospf filter-lsa-out
Parameters
| Parameter | Description | Value |
|---|---|---|
| all | Filters all outgoing LSAs except grace LSAs. | - |
| summary | Filters outgoing network summary LSAs (Type3). | - |
| ase | Filters outgoing AS external LSAs (Type5). | - |
| nssa | Filters outgoing NSSA LSAs (Type7). | - |
| acl acl-number | Specifies the number of the basic ACL. | The value is an integer that ranges from 2000 to 2999. |
| acl acl-name | Specifies the name of a Named ACL. | The name is a string of 1 to 32 case-sensitive characters. |
Usage Guidelines
Usage Scenario
When multiple links exist between two wireless access controllers, based on the filtering policy, the ospf filter-lsa-out command configures the local wireless access controller to filter the outgoing LSAs before sending them along specified links. This can reduce the unnecessary retransmission of LSAs and save bandwidth resources.
Configuration Impact
Filtering the outgoing LSAs on the specified OSPF interface can prevent useless LSAs from being sent to neighbors. This can reduce the size of the LSDB of neighbors and speed up the network convergence.
After the command is configured on an interface, the OSPF neighbor relationship of the interface will automatically re-establish.
Precautions
When the rule command is used to configure the filtering rules for an ACL, only the source address range that is specified by the source parameter and the period of time that is specified by the time-range parameter take effect.
Grace LSAs are used to inform the neighbor of the Graceful Restart (GR) time, cause, and interface instance ID when GR starts and ends. The command is not used to filter the grace LSAs.
