What is the recommended storm-control threshold value of broadcast and multicast on Cisco IOS catalyst switches for ports connected to users?

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You might find this article helpful:

This article presents the steps I took to develop a solution to protect the Catalyst 6500 in the presence of a Layer 2 loop. These steps include the following:

How to simulate of a Layer 2 loop

How to monitor the control plane traffic

Control plane policing

Storm control

Hardware rate limiting

Design recommendations

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