This object indicates the way to configure label advertisement policy.
By default, the label advertisement policy is implicitnull.
Before the label advertisement policy is configured, MPLS capability must be enabled.
Options:
1. explicitNull(1) -indicates that the label advertisement policy is explicitNull.
2. implicitNull(2) -indicates that the label advertisement policy is implicitNull.
3. nonNull(3) -indicates that the label advertisement policy is nonNull.
Default: implicitNull(2)