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Configuration Guide - IP Service
S1720, S2700, S5700, and S6720 V200R011C10

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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(Optional) Configuring Option Information Requested by a DHCP Client

(Optional) Configuring Option Information Requested by a DHCP Client


The Option 55 field in DHCP Request messages is used to set the request option list. DHCP clients use this option to specify network configuration parameters that need to be obtained from the DHCP server. By default, the Option 55 field carries request options 3, 6, 15, 28, 33, 44, 121, and 184 by default. You can run the dhcp client request option-list exclude command to set a list of default options that are excluded from the Option 55 field.

For option meanings, see DHCP Messages in Configuration- IP Service Configuration Guide - DHCP Configuration.


  1. Enter the system view.


  2. Enter the interface view or sub-interface view.

    interface interface-type interface-number [.subinterface-number ]

    Only the S5720EI, S5720HI, S6720EI, and S6720S-EI support sub-interfaces.

  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.

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

  4. Configure a list of default request options that are excluded from the Option 55 field in DHCP Request messages.

    dhcp client request option-list exclude option-code &<1-8>

    By default, the device does not configure the option to be excluded from the DHCP client request list.

Updated: 2020-02-26

Document ID: EDOC1000178170

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