ospf filter-lsa-out
Function
The ospf filter-lsa-out command configures an OSPF interface to filter outgoing LSAs.
The undo ospf filter-lsa-out command disables an OSPF interface from filtering 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 value is a string of 1 to 64 case-sensitive characters without spaces. The value must start with a letter. |
Usage Guidelines
Usage Scenario
When multiple links exist between two switches, you can run the ospf filter-lsa-out command to configure the local switch to filter the outgoing LSAs based on the filtering policy before the device sends these LSAs along specified links. This reduces the unnecessary retransmission of LSAs and saves 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 configured using the acl command, 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.
Example
<HUAWEI> system-view [HUAWEI] interface vlanif 100 [HUAWEI-Vlanif100] ospf filter-lsa-out all
<HUAWEI> system-view [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo portswitch [HUAWEI-GigabitEthernet0/0/1] ospf filter-lsa-out all