HP MSR2000/3000/4000 Router Series MPLS Command Reference

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[Sysname-Ethernet1/1] mpls enable
Related commands
display mpls interface
mpls label advertise
Use mpls label advertise to specify the type of label the egress will advertise to the penultimate hop.
Use undo mpls label advertise to restore the default.
Syntax
mpls label advertise { explicit-null | implicit-null | non-null }
undo mpls label advertise
Default
As an egress, the device advertises an implicit null label to the penultimate hop.
Views
System view
Predefined user roles
network-admin
Parameters
explicit-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.
non-null: Specifies the egress to advertise a normal label to the penultimate hop.
Usage guidelines
If the penultimate hop supports PHP, HP recommends that you configure the egress to advertise an
implicit null label to the penultimate hop. If you want to simplify packet forwarding on the egress but keep
labels in packets for the egress to determine QoS policies, you can configure the egress to advertise an
explicit null label to the penultimate hop. HP recommends that you do not use non-null labels except in
some special scenarios. For example, when OAM is configured on the egress, the egress can get the
OAM function entity status only through non-null labels.
As a penultimate hop, the device accepts the implicit null label, explicit null label, or normal label
advertised by the egress device.
For LDP LSPs, the mpls label advertise command triggers LDP to delete the LSPs established before the
command is executed and re-establishes new LSPs.
For BGP LSPs, the mpls label advertise command takes effect only for the BGP LSPs established after the
command 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.
<Sysname> system-view
[Sysname] mpls label advertise explicit-null