Controller Based WLANs

Why are multicast packets always sent at 1 Mbps in b/g band?

Product and Software: This article applies to all Aruba controllers with ArubaOS 2.x and 3.x.

Multicast and broadcast packets are sent in the air without ack. Also, to ensure all stations can receive the packets, they are sent at either basic rate or min tx-rate, whichever is lower. This impacts b/g band because normally the basic rate for b/g band is 1 or 2 Mbps. This is not sufficient for some multicast applications, such as video streaming.

To improve multicast performance, tune the following parameters:
1)    Change the basic rate of b/g band to 5 or 6 Mbps. Remove 1 & 2 Mbps from g-tx-rate as well.
2)    In ArubaOS 3.x, under ssid profile, enable the bc/mc optimization feature as follows:

(test) (config) #wlan ssid-profile default
(test) (SSID Profile "default") #?
...
mcast-rate-opt          Choose the optimal rate for broadcast/multicast frames
...
(test) (SSID Profile "default") # mcast-rate-opt ?
<cr>

The bc/mc optimization feature has been explained in another KB article. 

Version history
Revision #:
1 of 1
Last update:
‎06-30-2014 07:48 PM
Updated by:
 
Labels (1)
Contributors
Search Airheads
Showing results for 
Search instead for 
Did you mean: 
Is this a frequent problem?

Request an official Aruba knowledge base article to be written by our experts.