16Syntaxmpls label advertise { explicit-null | implicit-null }undo mpls label advertiseDefaultAs an egress, the device advertises an implicit null label to the penultimate hop.ViewsSystem viewPredefined user rolesnetwork-adminmdc-adminParametersexplicit-null: Specifies the egress to advertise an explicit null label of 0 to the penultimate hop.implicit-null: Specifies the egress to advertise an implicit null label of 3 to the penultimate hop.Usage guidelinesIf the penultimate hop supports PHP, HP recommends that you configure the egress to advertise animplicit null label to the penultimate hop. If you want to simplify packet forwarding on the egress but keeplabels in packets for the egress to determine QoS policies, you can configure the egress to advertise anexplicit null label to the penultimate hop.As a penultimate hop, the device accepts the implicit null label or explicit null label advertised by theegress device.For LDP LSPs, the mpls label advertise command triggers LDP to delete the LSPs established before thecommand is executed and reestablishes new LSPs.For BGP LSPs, the mpls label advertise command takes effect only on the BGP LSPs established after thecommand is executed. To apply the new setting to BGP LSPs established before the command is executed,delete the routes corresponding to the BGP LSPs, and then redistribute the routes.Examples# Configure the egress device to advertise an explicit null label to the penultimate hop. system-view[Sysname] mpls label advertise explicit-nullRelated commandsreset mpls ldpmpls lsr-idUse mpls lsr-id to configure an LSR ID for the local LSR.Use undo mpls lsr-id to delete the LSR ID of the local LSR.Syntaxmpls lsr-id lsr-idundo mpls lsr-id
