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NE20E-S V800R010C10SPC500 Configuration Guide - MPLS 01

This is NE20E-S V800R010C10SPC500 Configuration Guide - MPLS
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Configuring PHP

Configuring PHP

When you configure penultimate hop popping (PHP), specify a label that the egress assigns to the penultimate hop.

Context

Perform the following steps on the egress:

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 with 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.

    NOTE:

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

  4. Run commit

    The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055103

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