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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

Context

The size of data packets is limited at the network layer. Any time the network layer receives an IP packet to be sent, it checks to which local interface the packet needs to be sent and obtains the 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 IP layer disassembles the packet to fragments, each not longer than the MTU.

  • If the MTU is too small whereas the packet size is large, the packet is probably split into many fragments. Therefore, the packet may be discarded due to the insufficient QoS queue length.
  • If the MTU is too large, packets are transmitted slowly or even lost.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface pos interface-number

    The POS interface view is displayed.

  3. Run mtu mtu

    The MTU is configured for the POS interface.

    By default, the MTU of a POS interface is 1500 bytes.

    After changing the MTU on an interface using the mtu command, run the shutdown and undo shutdown/restart command in the interface view to restart the interface for the configuration to take effect.

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Updated: 2019-03-06

Document ID: EDOC1100069331

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