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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring an MPLS MTU on an Interface

Configuring an MPLS MTU on an Interface

An MPLS MTU can be configured on an interface to determine the maximum number of bytes in an MPLS packet that an interface can forward without fragmenting the packet.


The MPLS MTU is a forwarding plane parameter and is irrelevant to LSP establishment. The dependency between the MPLS MTU and the interface MTU is as follows:

  • If no MPLS MTU is set and an interface MTU is set on an interface, the interface MTU is used.

  • If an MPLS MTU and an interface MTU are set on an interface, the smaller value between the MPLS MTU and interface MTU is used.


  1. Run:


    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The view of an MPLS-enabled interface is displayed.

  3. Run:

    mpls mtu mtu

    An MPLS MTU is set on the interface.

    The configured MPLS MTU takes effect immediately, and there is no need to restart the interface.


    If the MPLS MTU configured using the mpls mtu command is used as the MPLS forwarding MTU, run the mpls path-mtu independent command to allow the MPLS MTU to take effect without being affected the interface MTU. The mpls path-mtu independent command is used when a Huawei device communicates with a non-Huawei device, which prevents low MPLS forwarding efficiency stemming from different MTU implementations.

  4. Run:


    The configuration is committed.

Updated: 2018-07-12

Document ID: EDOC1100028530

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