label distribution control-mode

Function

The label distribution control-mode command configures an LDP label distribution control mode.

The undo label-type command restores the default LDP label distribution control mode.

The default LDP label distribution control mode is ordered.

label distribution control-mode { ordered | independent }

undo label distribution control-mode

Parameter	Description	Value
ordered	Sets the LDP label distribution control mode to ordered.	-
independent	Sets the LDP label distribution control mode to independent.	-

Parameter

Description

Value

ordered

Sets the LDP label distribution control mode to ordered.

independent

Sets the LDP label distribution control mode to independent.

MPLS-LDP view

2: Configuration level

Task Name	Operations
mpls-ldp	write

Usage Scenario

A label distribution control mode is a policy used by an LSR when it distributes labels during the setup of an LSP.

Either of the following label distribution control modes can be used:

Independent
An LSR independently binds a label to a FEC and distributes this label to an upstream LSR, without waiting for a label assigned by a downstream LSR.
If the label distribution mode is DU and the distribution control mode is independent, an LSR directly distributes a label to its upstream LSR without waiting for a label assigned by a downstream LSR.
If label distribution mode is DoD and the distribution control mode is independent, a local LSR distributes a label to its upstream LSR after the upstream LSR sends a label request. The local LSR does not need to wait for a label assigned by a downstream LSR.
Ordered
A local LSR advertises a mapping between a label and a FEC to its upstream LSR only when the local LSR is the outbound node for the FEC or when it receives a label mapping message associated with the next hop for the FEC.
If the label distribution mode is DU and the distribution control mode is ordered, a local LSR distributes a label to its upstream LSR only after the local LSR receives a Label Mapping message sent by a downstream LSR.
If the label distribution mode is DoD and the distribution control mode is ordered, a local LSR distributes a label to its upstream LSR only after the local LSR receives a Label Mapping message sent by a downstream LSR.
The default LDP label distribution control mode (ordered) is recommended.

Prerequisites

MPLS LDP has been enabled globally using the mpls ldp command in the system view.

Precautions

If the label distribution control-mode command is run more than once, the latest configuration overrides the previous one.

# Set the LDP label distribution control mode to independent.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls ldp
[*HUAWEI-mpls-ldp] label distribution control-mode independent