How to configure the egress node to assign explicit-null labels to the penultimate hop

If the label of the penultimate hop is implicit-null, the value of the label that the egress node assigns to the penultimate hop is 3. If the label of the penultimate hop is non-null, the PHP feature is not used and the egress node properly assigns labels to the penultimate hop. The value of the label is equal to or larger than 16.

Typical failure: The label distribution mode is not modified, or the label distribution mode is set to non-null.

Solution: In the MPLS view, set the label distribution mode to explicit-null.

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