The mpls l2vpn pw-aps command associates a PW APS instance with a PW protection group.
The undo mpls l2vpn pw-aps command dissociates a PW APS instance with a PW protection group.
By default, a PW APS instance is not associated with any PW protection group.
| Parameter | Description | Value |
|---|---|---|
| apsId |
Specifies ID of a PW APS instance. |
The value is an integer ranging from 1 to 16384. |
| admin |
Configures the PW protection group associated with a PW APS instance as the administrative protection group. |
- |
| reference |
Configures the PW protection group associated with a PW APS instance as the reference protection group. |
- |
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Usage Scenario
In PW APS networking, PW protection groups need to be associated with a PW APS instance, so that the status of the PW APS instance determines the protection switching in the PW protection group.
Multiple PW protection groups with the same source and destination often coexist on the network. They share LSPs or MPLS TE tunnels. If a tunnel fault occurs, all PW protection groups may become unavailable. To better utilize resources, you can associate the PW protection groups that have the same source and destination with the same PW APS instance and configure one of them as the administrative PW protection group and the others as the reference PW protection groups. After the configuration, PW OAM only needs to monitor the status of the administrative PW protection group. The reference PW protection groups, which are associated with the administrative PW protection group, then perform switching or remain unchanged based on the status monitoring results. The mpls l2vpn pw-aps command allows you to configure multiple PW protection groups to share one PW APS state machine and one PW OAM monitoring task, reducing APS resource consumption and minimizing PW OAM signaling transmission.Prerequisites
A PW APS instance has been created using the pw-aps command, and a LDP, SVC, or PWE3 PW protection group has been configured in the interface view.
Configuration Impact
If the primary PW in the administrative PW APS protection group fails, APS protection switching will be implemented in both the administrative and reference PW protection groups. If the primary PW in a reference PW protection group fails, APS protection switching will not be implemented.
Follow-up Procedure
Enable PW OAM to monitor the administrative PW protection group. This configuration can increase the link status monitoring speed.
Precautions
If the mpls l2vpn pw-aps command is run more than once, the latest configuration does not override the previous one. If you want to change the type of an associated PW protection group between admin and reference, delete the existing association and then reconfigure it.
A PW protection group can be associated with only one PW APS instance, but a PW APS instance can be associated with multiple protection groups. A PW APS instance must be associated with one and only one administrative PW protection group, but can be associated with multiple reference PW protection groups.Only the NetEngine 8000 F1A supports this command.
<HUAWEI> system-view [~HUAWEI] mpls [*HUAWEI-mpls] quit [*HUAWEI] mpls l2vpn [*HUAWEI-l2vpn] quit [*HUAWEI] pw-aps 1 [*HUAWEI-pw-aps-1] quit [*HUAWEI] interface GigabitEthernet 0/1/0 [*HUAWEI-GigabitEthernet0/1/0] mpls l2vc 1.1.1.1 1 [*HUAWEI-GigabitEthernet0/1/0] mpls l2vc 1.1.1.1 2 secondary [*HUAWEI-GigabitEthernet0/1/0] mpls l2vpn pw-aps 1 admin