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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
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Chapter 6 Configuring Radio Settings
Configuring the Beacon Period and the DTIM
Configuring Protected Ports
To prevent communication between client devices associated to different access points on your wireless
LAN, you must set up protected ports on the switch to which the wireless devices are connected.
Beginning in privileged EXEC mode, follow these steps to define a port on your switch as a protected
port:
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/docs/switches/lan/catalyst3550/software/release/12.1_12c_ea1/configurat
ion/guide/3550scg.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 wireless device 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:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
interface
interface-id
Enter interface configuration mode, and enter the type and
number of the switchport interface to configure, such as
gigabitethernet0/1
.
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
slot
/
port
}
Enter interface configuration mode for the radio interface.
The 2.4-GHz radio and the 802.11n 2.4-GHz radio is 0.
The 5-GHz radio and the 802.11n 5-GHz radio is 1.
Step 3
beacon period
value
Set the beacon period. Enter a value in Kilomicroseconds.