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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Configuring the MTU

Configuring the MTU


The size of data packets is limited at the network layer. Upon receiving an IP packet to be sent, the network layer checks to which local interface the packet needs to be sent and obtains the maximum transmission unit (MTU) configured on the interface. Then the network layer compares the MTU with the packet length. If the packet length is longer than the MTU, the network layer disassembles the packet to fragments, each no longer than the MTU.
  • If the MTU is too small whereas the packet size is large, the packet is split into many fragments. Therefore, the packet may be discarded due to insufficient QoS queue length.
  • If the MTU is too large, packets are transmitted slowly or even lost.


  1. Run system-view

    The system view is displayed.

  2. Run interface cellular interface-number

    The LTE cellular interface view or LTE channel interface view is displayed.

  3. Run mtu mtu

    The MTU is configured for the LTE cellular interfaces or LTE channel interfaces.

    By default, the MTU is 1500 bytes for the LTE cellular interfaces or LTE channel interfaces.

Updated: 2019-03-06

Document ID: EDOC1100069331

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