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Configuration Guide - IP Service

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Configuring the Switch to Fragment Outgoing IP Packets

Configuring the Switch to Fragment Outgoing IP Packets

Context

During actual packet forwarding, the length of an IP packet may exceed the MTU value. When the remote device or intermediate forwarding device receives IP packets, if it checks the packet length and discards packets whose length is longer than the Maximum Transmission Unit (MTU) on the interface, network communication is interrupted. In this case, fragmentation for outgoing IP packets can be configured so that the system fragments the packets. In this way, all IP packets can be forwarded properly.

Procedure

  • Configure fragmentation for outgoing forwarding-plain IP packets.
    1. Run system-view

      The system view is displayed.

    2. Run ipv4 fragment enable

      Fragmentation is enabled for outgoing forwarding-plain IP packets.

      By default, fragmentation for outgoing forwarding-plain IP packets is disabled.

      NOTE:

      This command takes effect only for the forwarding-plain packets but not for the control-plain packets.

      Only the S5720HI, S5730HI, and S6720HI support this command.

  • Configure fragmentation for outgoing control-plain IP packets
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

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

      Only the S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

    4. Run clear ip df

      The fragmentation is enabled for outgoing control-plain IP packets.

      By default, fragmentation for outgoing control-plain IP packets on an interface is disabled.

      NOTE:

      This command takes effect only for the control-plain packets but not for the forwarding-plain packets.

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Updated: 2019-04-20

Document ID: EDOC1100065678

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