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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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Enabling the DHCP Client Function

Enabling the DHCP Client Function

Context

Before a device can function as a DHCP client, you must enable the DHCP client function.

After an interface is enabled with the DHCP client function, the interface can obtain network parameters including the IP address from the DHCP server. If the allocated IP address and IP addresses of other interfaces are on the same network segment, the interface does not use this IP address and does not re-apply for an IP address. To allow the interface to re-apply for an IP address, run the shutdown and then the undo shutdown commands on the interface. Alternatively, run the undo ip address dhcp-alloc and then the ip address dhcp-alloc command on the interface.

Procedure

  1. Enter the system view.

    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. Enable the DHCP client function.

    ip address dhcp-alloc

    By default, the DHCP client function is enabled on VLANIF1 of the S1720GW, S1720GWR, S1720GW-E, and S1720GWR-E. The DHCP client function is disabled on the interfaces of other switches.

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Updated: 2020-02-26

Document ID: EDOC1000178170

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