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Configuration Guide - IP Service

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

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

Context

The Option55 field in DHCP Request packets 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 Option55 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 Option55 field or run the dhcp client request option-list command to set a list of other options that the Option55 field carries besides the default options based on network requirements. The other options include option 4, 7, 17, 42, 43, 66, 67, 120, and 129.

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

Procedure

  1. Run system-view

    The system view is displayed.

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

    The interface view or sub-interface view is displayed.

    NOTE:

    Only the S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, 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.
    NOTE:

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

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

    A list of default request options that are excluded from the Option55 field in DHCP Request packets is configured.

    By default, the Option55 field in DHCP Request packets carries request options 3, 6, 15, 28, 33, 44, 121, and 184 by default.

  5. Run dhcp client request option-list option-code &<1-9>

    A list of request options that the Option55 field in DHCP Request packets carries besides the default options is configured.

    By default, the Option55 field in DHCP Request packets carries request options 3, 6, 15, 28, 33, 44, 121, and 184 by default.

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Updated: 2018-12-24

Document ID: EDOC1100038342

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