12-17-2012 05:38 AM - edited 03-07-2019 10:39 AM
Hi all,
How do I limit broadcast/mulitcast traffic on a switchport to e.g. 5000 pps ? I don't want the port to shut down, just block or drop broadcast traffic that exceeds 5000 pps
Best regards,
Jesper
12-18-2012 01:14 AM
Hi,
I just found this: http://blog.ipexpert.com/2010/03/15/old-ccie-myths-storm-control/
So maybe you are not blocking one type of traffic which is responsible for the ISP shutting down the link.
Could you test with only multicast or only broadcast and tell us what it does.
Regards.
Alain
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12-18-2012 02:47 AM
Hi Alain,
I know what kind of traffic that causes this multicast storm. It's LLC traffic caused by a spanning-tree fault in the network.
I have attached a wiresahark trace that shows the LLC multicast storm. The trace taken with an older wireshark version (1.2) as the new version crashed all the time.
Regards,
Jesper
12-17-2012 06:28 AM
Hi,
sorry my windows clipboard had fun with me
Regards.
Alain
Don't forget to rate helpful posts.
12-17-2012 04:09 PM
Sent from Cisco Technical Support iPad App
12-18-2012 09:55 AM
Just one thing.
Remember that at L2 all broadcast traffic is a multicast, but not the other way around (all multicast traffis is not a broadcast). When using storm control you should have this in mind.
You should set your multicast level higher than your broadcast.
Also keep in mind, that storm control does not differentiate traffic clases, and you may be dropping traffic that may be critical for you (and for the sanity of your network).
Daniel
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