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6-16

Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

OL-5260-01

Chapter 6 Configuring Radio Settings

Configuring the Beacon Period and the DTIM

To disable protected port, use the no switchport protected interface configuration command.

For detailed information on protected ports and port blocking, refer to the “Configuring Port-Based

Traffic Control” chapter in the Catalyst 3550 Multilayer Switch Software Configuration Guide,

12.1(12c)EA1. Click this link to browse to that guide:

http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_guide_book09186a

008011591c.html

Configuring the Beacon Period and the DTIM

The beacon period is the amount of time between access point beacons in Kilomicroseconds. One Kµsec

equals 1,024 microseconds. The Data Beacon Rate, always a multiple of the beacon period, determines

how often the beacon contains a delivery traffic indication message (DTIM). The DTIM tells power-save

client devices that a packet is waiting for them.

For example, if the beacon period is set at 100, its default setting, and the data beacon rate is set at 2, its

default setting, then the access point sends a beacon containing a DTIM every 200 Kµsecs. One Kµsec

equals 1,024 microseconds.

The default beacon period is 100, and the default DTIM is 2. Beginning in privileged EXEC mode,

follow these steps to configure the beacon period and the DTIM:

Configure RTS Threshold and Retries

The RTS threshold determines the packet size at which the access point issues a request to send (RTS)

before sending the packet. A low RTS Threshold setting can be useful in areas where many client devices

are associating with the access point, or in areas where the clients are far apart and can detect only the

access point and not each other. You can enter a setting ranging from 0 to 2339 bytes.

Step 3

switchport protected Configure the interface to be a protected port.

Step 4

end Return to privileged EXEC mode.

Step 5

show interfaces interface-id

switchport

Verify your entries.

Step 6

copy running-config startup-config (Optional) Save your entries in the configuration file.

Command Purpose

Step 1

configure terminal Enter global configuration mode.

Step 2

interface dot11radio { 0 | 1 } Enter interface configuration mode for the radio interface. The

2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.