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CLI-based Configuration Guide - WLAN-AC

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides the concepts, configuration procedures, and configuration examples of WLAN-AC features.
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Configuring a DHCP Server

Configuring a DHCP Server

Configuring a DHCP Server

To go online normally, APs and STAs must obtain IP addresses. You can configure an AC as a DHCP server or use an independent DHCP server to allocate IP addresses to APs and STAs.
  • When an enterprise branch has no independent DHCP server, configure an AC as the DHCP server.
  • An independent DHCP server applies to large WLANs of large- and medium-sized campus networks.

For details on how to configure a DHCP server, see Configuring a DHCP Server.

A service DHCP address pool assigns IP addresses to STAs, and a management DHCP address pool assigns IP addresses to APs. The two types of DHCP address pools must be configured separately.

Configuring the Option 43 Field

If an AC functions as a DHCP server to assign IP addresses to APs, and the AC and APs are in different network segments, you need to configure the Option 43 field to specify the IP address of the AC for APs; otherwise, the APs cannot discover the AC and fail to go online on the AC.
  1. Run the system-view command to enter the system view.
  2. Run the ip pool ip-pool-name command to create a global address pool and enter its view.
  3. Run any of the following commands to configure the option 43 field.
    • option 43 hex hex-string
    • option 43 sub-option 3 ascii ascii-string
    • option 43 sub-option 2 ip-address ip-address &<1-8>
    • option 43 sub-option 1 hex hex-string

Use one of the option 43 sub-option 3 ascii ascii-string, option 43 sub-option 2 ip-address ip-address &<1-8>, and option 43 sub-option 1 hex hex-string commands to specify AC's IP address for the APs. If you run two or three of the commands simultaneously, only the last command takes effect.

If the AC and APs are in the same network segment, you do not need to configure the Option 43 field, and the APs can discover the AC in broadcast mode. After Option 43 is configured, the APs unicast Discover Request packets to the IP address carried in Option 43 to discover the AC. If the APs do not receive any Discovery Response packet after sending unicast Discovery Request packets 10 consecutive times, the APs then broadcast packets to discover the AC.

Updated: 2019-08-07

Document ID: EDOC1100033726

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