Disable Short Gi

The following scenario shows how to disable the short guard interval which forces the configured network to use the long preamble instead of the default short guard.

Disable Short Guard Interval

Description

In this example, a WLAN interface will be created on top of the 2.4GHz or 5GHz radio module in access-point mode. Then, the short guard interval will be disabled be mean of the disable-short-gi command.

Scenario

Note

Note that the long preamble is considered legacy so it should be only used when very old devices are present in the deployment since the performance is degraded by around 10%.

Step 1: Set the following configuration in DUT0:

set controllers wlan radios wifi1 band 2.4GHz
set controllers wlan radios wifi1 channel 1
set controllers wlan radios wifi1 bandwidth 20MHz
set controllers wlan radios wifi1 mode 802.11n
set interfaces bridge br0
set interfaces wlan wlan4 bridge-group bridge br0
set interfaces wlan wlan4 phy wifi1
set interfaces wlan wlan4 type access-point security akm none
set interfaces wlan wlan4 type access-point ssid network_2.4GHz

Step 2: Set the following configuration in DUT0:

set controllers wlan radios wifi1 disable-short-gi

Step 3: Set the following configuration in DUT0:

set controllers wlan installation indoor
set controllers wlan radios wifi0 band 5GHz
set controllers wlan radios wifi0 channel 36
set controllers wlan radios wifi0 bandwidth 80MHz
set controllers wlan radios wifi0 mode 802.11n
set controllers wlan radios wifi0 mode 802.11ac
set controllers wlan radios wifi0 mode 802.11ax
set interfaces bridge br0
set interfaces wlan wlan1 bridge-group bridge br0
set interfaces wlan wlan1 phy wifi0
set interfaces wlan wlan1 type access-point security akm none
set interfaces wlan wlan1 type access-point ssid network_5GHz

Step 4: Set the following configuration in DUT0:

set controllers wlan radios wifi0 disable-short-gi

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