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S5720HI V200R010C00 Configuration Guide - WLAN-AC

This document describes native AC (hereinafter referred to as WLAN AC) configuration procedures and provides configuration examples.

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Configuring Option 43 on the DHCP Server

Configuring Option 43 on the DHCP Server


If an AP and the ACs are located in different network segments, the AP cannot discover the ACs through broadcast after it obtains an IP address from the DHCP server. To address this problem, configure Option 43 on the DHCP server to advertise AC IP addresses to the AP.

After Option 43 is configured, the AP unicasts Discovery Request packets to the IP addresses carried in Option 43. If the IP addresses specified by Option 43 do not respond, the AP broadcasts Discovery Request packets to request IP addresses of the ACs in the local network segment. Option 43 only needs to carry addresses of the active and standby ACs for the AP and does not carry irrelevant active ACs' IP addresses; otherwise, the AP may not connect to the correct AC.

Usually, an independent device is used as a DHCP server. Perform correct configurations on the selected DHCP server. The following example uses a Huawei router as a DHCP server.


  1. Run:


    The system view is displayed.

  2. Run:

    dhcp enable

    DHCP is enabled.

    By default, DHCP is disabled.

  3. Run:

    ip pool ip-pool-name

    The global address pool view is displayed.

  4. Run:

    option 43 sub-option 2 ip-address ip-address &<1-8>

    The Option 43 field is set to the IP addresses of the active AC and standby AC.

Updated: 2019-12-28

Document ID: EDOC1000141952

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