The ospf filter-lsa-out multi-area command enables an OSPF multi-area adjacency interface to filter the LSAs to be sent.
The undo ospf filter-lsa-out multi-area command disables an OSPF multi-area adjacency interface from filtering the LSAs to be sent.
By default, OSPF multi-area adjacency interfaces do not filter the LSAs to be sent.
| Parameter | Description | Value |
|---|---|---|
| all |
Filters all LSAs except Grace LSAs. |
- |
| ase |
Filters AS-external LSAs (Type-5 LSAs). |
- |
| acl |
Specifies the ACL for route filtering. |
- |
| ase-acl-num |
Specifies the number of a basic ACL. |
The value is an integer that ranges from 2000 to 2999. |
| ase-acl-name |
Specifies the name of a named basic ACL. |
The value is a string of 1 to 64 case-sensitive characters, spaces not supported. The name must start with a letter or digit, and cannot contain only digits. |
| nssa |
Filters NSSA LSAs (Type-7 LSAs). |
- |
| nssa-acl-num |
Specifies the number of a basic ACL. |
The value is an integer that ranges from 2000 to 2999. |
| nssa-acl-name |
Specifies the name of a named basic ACL. |
The value is a string of 1 to 64 case-sensitive characters, spaces not supported. The name must start with a letter or digit, and cannot contain only digits. |
| summary |
Filters Network-summary LSAs (Type-3 LSAs). |
- |
| sum-acl-num |
Specifies the number of a basic ACL. |
The value is an integer that ranges from 2000 to 2999. |
| sum-acl-name |
Specifies the name of a named basic ACL. |
The value is a string of 1 to 64 case-sensitive characters, spaces not supported. The name must start with a letter or digit, and cannot contain only digits. |
| area-id-integer |
Specifies the ID of an OSPF area. |
The value is a decimal integer ranging from 0 to 4294967295. |
| area-id-ipv4 |
Specifies the ID of an OSPF area. |
The value is in the format of an IP address. |
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Usage Scenario
If multiple links exist between two devices, you can run the ospf filter-lsa-out multi-area command to configure the local device to filter the LSAs to be sent. This prevents unnecessary LSA transmission and reserves bandwidth resources.
Prerequisites
The ospf enable multi-area command has been run.
Configuration Impact
The ospf filter-lsa-out multi-area command prevents useless LSAs from being sent to OSPF neighbors, which reduces the size of the neighbors' LSDBs and speeds up network convergence.
After the ospf filter-lsa-out multi-area command is run on an interface, the neighbor relationships on the interface are reestablished.Precautions
When filtering conditions are configured for a named ACL, only the configurations specified by source and time-range take effect.
Grace LSAs are used to inform neighbors of the graceful restart (GR) time, cause, and interface instance ID when a GR starts or ends. The ospf filter-lsa-out multi-area command does not apply to Grace LSAs.<HUAWEI> system-view [~HUAWEI] ospf 1 [*HUAWEI-ospf-1] area 0 [*HUAWEI-ospf-1-area-0.0.0.0] quit [*HUAWEI-ospf-1] area 1 [*HUAWEI-ospf-1-area-0.0.0.1] quit [*HUAWEI-ospf-1] quit [*HUAWEI] interface GigabitEthernet 0/1/0 [*HUAWEI-GigabitEthernet0/1/0] ospf enable 1 area 0 [*HUAWEI-GigabitEthernet0/1/0] ospf enable multi-area 1 [*HUAWEI-GigabitEthernet0/1/0] ospf filter-lsa-out all multi-area 1