Configuring PHP

Procedure

1. Run system-view

   The system view is displayed.

2. Run mpls

   The MPLS view is displayed.

3. Run label advertise { explicit-null | implicit-null | non-null }

   The label assigned to the penultimate node is specified.

   You can specify one of the following parameters:

   • explicit-null: disables PHP. If this parameter is configured, the egress assigns an explicit null label with value 0 to the penultimate node. explicit-null supports MPLS QoS, which helps save label resources in the egress. If E2E services have QoS attributes carried in the EXP field in a label, explicit-null can be configured to save label resources and prevent EXP value loss.

   • non-null: disables PHP. If this parameter is configured, the egress assigns a label with a value greater than or equal to 16 to the penultimate node. The non-null label consumes resources on the egress, which is not recommended. This parameter can be used when the egress needs to identify services based on labels.

   

   PHP takes effect on LSPs that are to be established, but not on existing LSPs.

4. Run commit

   The configuration is committed.