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Cisco Wireless ISR and HWIC Access Point Configuration Guide
OL-6415-04
Chapter 2 Configuring Radio Settings
Configuring Fragmentation Threshold
Use the no form of the command to reset the setting to defaults.
Configuring Fragmentation Threshold
The fragmentation threshold determines the size at which packets are fragmented (sent as several pieces
instead of as one block). Use a low setting in areas where communication is poor or where there is a great
deal of radio interference.
The default setting is 2338 bytes. Beginning in privileged EXEC mode, follow these steps to configure
the fragmentation threshold:
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.
Step 3
fragment-threshold value Set the fragmentation threshold. Enter a setting from 256 to
2346 bytes for the 2.4-GHz radio. Enter a setting from 256 to
2346 bytes for the 5-GHz radio.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Use the no form of the command to reset the setting to defaults.
Enabling Short Slot Time for 802.11g Radios
You can increase throughput on the 802.11g, 2.4-GHz radio by enabling short slot time. Reducing the
slot time from the standard 20 microseconds to the 9-microsecond short slot time decreases the overall
backoff, which increases throughput. Backoff, which is a multiple of the slot time, is the random length
of time that a station waits before sending a packet on the LAN.
Many 802.11g radios support short slot time, but some do not. When you enable short slot time, the
wireless device uses the short slot time only when all clients associated to the 802.11g, 2.4-GHz radio
support short slot time.
Short slot time is supported only on the 802.11g, 2.4-GHz radio. Short slot time is disabled by default.
Command Purpose
Step 1
router(config-if)# slot-time-short In radio interface mode, enter this command to enable short slot
time.
Step 2
no slot-time-short (optional) Enter no slot-time-short to disable short slot time.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose