Controller Based WLANs

What is this configurable parameter called "broadcast-filter"?

Aruba Employee

Upon upgrade to Aruba OS 3.3.2.9 and later, configurable parameters named "drop-mcast" and "voip-proxy-arp" have been renamed as below and moved under the Virtual AP Profile:

 

Parameter names in Aruba OS versions

Pre 3.3.2.9

3.3.2.9 and after

voip-proxy-arp

broadcast-filter arp

drop-mcast

broadcast-filter all

  1. broadcast-filter arp

ü This converts broadcast ARP requests and responses to unicast.

ü The modified frame is sent directly to station.

ü This helps reduce broadcast ARPs in the air.

ü For WiFi phones, this option when enabled improves the battery life (other phones do not have to wake up and receive irrelevant ARP packets).

  1. broadcast-filter all

ü This option drops all multicast and broadcast traffic in the air.

ü It does not drop broadcast DHCP traffic. Instead converts it to unicast.

ü It would drop broadcast ARP also unless "broadcast-filter arp" is configured first.

ü In Aruba OS 3.3.2.9 and later, this option is included in the base OS and does not need the Voice Services Module license.

 

Configuration Example

 

1. If customers running ArubaOS versions pre-3.3.2.4 have the configuration as below,

 

!

firewall voip-proxy-arp

!

wlan ssid-profile TEST_SSID_PROFILE

drop mcast

. . . .

!

 

2. If customers running ArubaOS versions 3.3.2.5 -- 3.3.2.8 have the configuration as below,

 

!

firewall voip-proxy-arp

!

wlan ssid-profile TEST_SSID_PROFILE

drop mcast

. . . .

!

wlan virtual-ap TEST_VAP_PROFILE

voip-proxy-arp

ssid-profile TEST_SSID_PROFILE

. . . .

!

 

3. Upgrade to Aruba OS version 3.3.2.9 and later, the configuration will change automatically as below:

 

!

wlan ssid-profile TEST_SSID_PROFILE

. . . .

!

wlan virtual-ap TEST_VAP_PROFILE

broadcast-filter arp

broadcast-filter all

ssid-profile TEST_SSID_PROFILE

. . . .

!

 

Notes:

 

  •  After upgrading the controller to Aruba OS 3.3.2.9 or higher, should there be a need to roll-back to a pre-3.3.2.9 build, the voip-proxy-arp and drop-mcast options would have to be reconfigured manually as shown in points 1 and 2 above.
  broadcast-filter arp

This should be configured first to allow ARP.

  •  broadcast-filter all

This is configured afterwards to drop multicast and broadcast, as needed. However, DHCP broadcasts are not dropped but converted to unicast.

Version history
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Last update:
‎07-01-2014 02:26 PM
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