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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Configuring Static PMTU

Configuring Static PMTU

Context

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.

Procedure

  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. (For Ethernet interfaces) Run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

      The command fails if any Layer 2 configuration exists on the interface. In such a case, clear the Layer 2 configurations on the interface before running the undo portswitch command.
      NOTE:

      You can run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch the working mode of multiple Ethernet interfaces in batches.

    3. Run ipv6 enable

      The IPv6 function is enabled on the interface.

      By default, the IPv6 function is disabled on an interface.

    4. 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.

      NOTE:
      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.
    5. 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.

  4. Run commit

    The configuration is committed.

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Updated: 2019-03-21

Document ID: EDOC1000166635

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