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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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Setting the Aging Time of Dynamic PMTU

Setting the Aging Time of Dynamic PMTU


When the device functions as a source node and sends packets to a destination node, the device dynamically negotiates the PMTU with the destination node according to the IPv6 MTU values of interfaces and fragments packets based on the PMTU. After the PMTU ages out, the dynamic PMTU is deleted. The source node dynamically renegotiates the PMTU with the destination node.


When both static and dynamic PMTUs are configured, only static PMTU takes effect. Static PMTU entries never age.

The interface MTU, IPv6 interface MTU, and PMTU are valid only for packets generated on the device, not for packets forwarded by the host.


  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 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.

      The dynamic PMTU is negotiated based on the IPv6 MTU on an interface.

      • 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

      The system view is displayed.

  3. Run ipv6 pathmtu age age-time

    The aging time is set for dynamic PMTU entries.

    By default, the aging time of dynamic PMTU entries is 10 minutes.

Updated: 2019-03-06

Document ID: EDOC1100069333

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