Specifications

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Cisco Wireless LAN Controller Configuration Guide
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Chapter 4 Configuring Controller Settings
Configuring DHCP Proxy
Step 7 Click Save Configuration to save your changes.
Using the CLI to Configure 802.11h Parameters
To configure 802.11h parameters using the controller CLI, follow these steps:
Step 1 Disable the 802.11a network by entering this command:
config 802.11a disable network
Step 2 Enable or disable the access point to announce when it is switching to a new channel and the new channel
number by entering this command:
config 802.11h channelswitch {enable | disable} switch_mode
You can enter a 0 or 1 for the switch_mode parameter to specify whether transmissions are restricted until
the actual channel switch (0) or are not restricted (1). The default value is disabled.
Step 3 Configure a new channel using the 802.11h channel announcement by entering this command:
config 802.11h setchannel channel channel
Step 4 Configure the 802.11h power constraint value by entering this command:
config 802.11h powerconstraint value
The default value for the value parameter is 3 dB.
Step 5 Reenable the 802.11a network by entering this command:
config 802.11a enable network
Step 6 See the status of 802.11h parameters by entering this command:
show 802.11h
Information similar to the following appears:
Power Constraint................................. 0
Channel Switch................................... Disabled
Channel Switch Mode.............................. 0
Configuring DHCP Proxy
When DHCP proxy is enabled on the controller, the controller unicasts DHCP requests from the client
to the configured servers. Consequently, at least one DHCP server must be configured on either the
interface associated with the WLAN or the WLAN itself.
When DHCP proxy is disabled on the controller, those DHCP packets transmitted to and from the clients
are bridged by the controller without any modification to the IP portion of the packet. Packets received
from the client are removed from the CAPWAP tunnel and transmitted on the upstream VLAN. DHCP
packets directed to the client are received on the upstream VLAN, converted to 802.11, and transmitted
through a CAPWAP tunnel toward the client. As a result, the internal DHCP server cannot be used when
DHCP proxy is disabled. The ability to disable DHCP proxy allows organizations to use DHCP servers
that do not support Cisco’s native proxy mode of operation. It should be disabled only when required by
the existing infrastructure.