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Need help controlling Multicast Packets

Answered Question
Mar 14th, 2012
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Situation is this:


An engineer has one switchport connected to a 2960. Connected to that port is a unmanaged switch. On that unmanaged switch he has 3 devices. His computer, and two other specialized network devices. One of these devices when connected floods the network with multicast packets at about 100 packets per second. The multicast packet dosn't need to get out onto the company network.


How do I block or filter the packet from entering the switch and flooding the company lan? It seems there are ways of blocking from exiting the port, but not entering the switch. I tried storm-control multicast level 1, but that didn't work.


I'm thinking IGMP snooping may help, but I'm unsure of how to configure it. What about a port level ACL?


Thanks in advance.

Correct Answer by John Blakley about 5 years 5 months ago

You could try to use a port acl to block the multicast destination that they're going to. Apply it inbound on the port.

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Correct Answer
John Blakley Wed, 03/14/2012 - 08:41
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You could try to use a port acl to block the multicast destination that they're going to. Apply it inbound on the port.

sean.graham Wed, 03/14/2012 - 09:56
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Ok, I was just over thinking it. Using an ACL on the port was simple enough to do what I wanted. Thanks.

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