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CLI-based Configuration Guide - IP Service

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

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Configuring Static PMTU

Configuring Static PMTU


Generally, PMTU is dynamically negotiated according to the IPv6 MTU value of an interface. In special situations, to protect devices on the network and avoid attacks from large-sized packets, you can manually configure the PMTU to a specified destination node to control the maximum length of packets forwarded from the device to the destination node.


When the PMTU from the device to a specified destination node is set, the IPv6 MTU values for interfaces on all intermediate devices cannot be smaller than the configured PMTU value. Otherwise, packets are discarded.


  1. Run system-view

    The system view is displayed.

  2. (Optional) Configure the IPv6 MTU for an interface.

    1. Run interface interface-type interface-number

      The specified interface view is displayed.

    2. Run ipv6 mtu mtu

      The MTU of IPv6 packets on an interface is set.

      By default, the MTU of IPv6 packets on an interface is 1500 bytes.

      • For the AR100 series, AR120 series, AR161, AR161W, AR161EW, AR161EW-M1, AR161G-L, AR161G-Lc, AR161G-U, AR169, AR169W, AR169EW, AR169EGW-L, AR169CVW, AR169CVW-4B4S, AR169G-L, AR169-P-M9, AR169W-P-M9, AR169RW-P-M9, the default value on the tunnel interface of the IPv6 over IPv4 tunnel is 1480 bytes.
      • After the MTU value is changed, run the shutdown and undo shutdown commands or the restart (interface view) command to restart the interface and allow the changes to take effect.

    3. Run quit

      Return to the system view.

  3. Run ipv6 pathmtu ipv6-address [ vpn-instance vpn-instance-name ] [ path-mtu ]

    The PMTU for a specified IPv6 address is set.

    By default, the PMTU is not set.

    If the parameter path-mtu is not specified, the PMTU for a specified IPv6 address is 1500 bytes.

Updated: 2019-03-06

Document ID: EDOC1100069333

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