Wireless Access

Hello,

On the dashboard of my controller, i can see that multicast frames (to client)  are present.

My controllers are in 6.4.2.4.

"Airgroup" is disabled.

"Drop Broadcast and Multicast" is enabled on every VAP profile.

"BC-MC Optimization"  is enabled on  every VLAN.

So, what is the source of this traffic ?

Thanks,

Emmanuel

- The button is called "Drop Broadcast and Unknown Multicast".  That means any client that has subscribed to a multicast stream will still be delivered that multicast traffic.  DHCP and ARP is still broadcast traffic and is still delivered.  If you don't have an application where clients can subscribe to a multicast stream, you can probably ignore this

- A portion of management traffic is  broadcast traffic, as well.

- Double check to all of your VAPs in AP-Groups do have drop broadcast and multicast enabled.

Hello,

Thanks for your response.

I had not  seen  "unknown" in "Drop Broadcast and Unknown Multicast".

I would like dropping all multicast traffic. How do I do ?

Emmanuel

There is nothing to do.

Please see the article here:  http://community.arubanetworks.com/t5/Technology-Blog/Removing-the-Bottleneck-in-Wireless/ba-p/77978 for more ideas.

Hi,

We can optimise BCMC on VLAN and on a VAP here is how it works and  to enable,

On a VLAN :

• Bcmc-optimization is a VLAN interface-based knob that drops all bcast/mcast traffic (except for ARP, DHCP, VRRP, IPv6 RA and NS) on the VLAN, before any ACL can be applied.
• In addition It stops the flooding to other wired ports and eth tunnels - this is also useful to stop flooding of spilt-tunnels to RAPs.
• If you are dropping broadcasts at the VAP or VLAN level, you will never see those broadcasts or multicast in the air, so it negates BCMC optimization at the SSID level.

To Enable :

On a VAP :

Hope you got some more clarity on this.

Please feel free for any further query on this.