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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

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 DHCP Relay on an Interface

Configuring DHCP Relay on an Interface


When the network where a DHCP client resides does not have a DHCP server, a DHCP relay agent can be configured to forward DHCP messages of the client to a DHCP server.

A DHCP message is forwarded between a DHCP client and a DHCP server at most 16 times, and then the DHCP message is discarded.


  1. Run system-view

    The system view is displayed.

  2. Run dhcp enable

    DHCP is enabled.

  3. Run interface interface-type interface-number

    The interface view is displayed.

  4. 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.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  5. Run ip address ip-address { mask | mask-length }

    An IP address is assigned to the interface.

  6. Run dhcp select relay

    The DHCP relay function is enabled on the interface.

  7. Run commit

    The configuration is committed.

Follow-up Procedure

When the DHCP relay function is enabled on an interface, specify the DHCP server IP address on the interface in either of the following ways:
Updated: 2019-04-18

Document ID: EDOC1100039535

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