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CPU Receive Multicast Queue is full on Controller

Lately we've started getting this alarm om some of the controllers (we have 18 controllers). Does anyone have any more information on what the severity of this is, an how to troubleshoot?

The WCS help text for this alarm is "This indicates that a high level of ARP traffic is being received at the Controller. Continued receipt of this notification may indicate the presence of an ARP storm on the network to which the controller is attached."

It doesn't say however if this is a problem on the "AP side" of the controller or on the "infrastructure side"

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Re: CPU Receive Multicast Queue is full on Controller

A 4400 series controller running software release 3.1.105.0 may fail to respond to ARP requests for the ap-manager2 interface's IP address when the ARP request is addressed at the MAC layer to the unicast MAC address of the interface rather than to the broadcast MAC address. As a result, there may be sporadic interruptions in connectivity at ARP refresh time, resulting in the periodic loss of associations for access points associated through the ap-manager2 interface.

If you are using above release I would recommend upgrading the controller to version 3.2.171.5. I hope it may help you.

Community Member

Re: CPU Receive Multicast Queue is full on Controller

i've 6 wism's with code 4.1.181 and still get this same messages. how can this be minimized, if not eliminated?

Community Member

Re: CPU Receive Multicast Queue is full on Controller

ours are running 4.2.62.0

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