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How to protect Cisco Catalyst switches from unicast flooding
LAN switches use forwarding tables (Layer 2 (L2) tables and Content Addressable Memory (CAM) tables) to direct traffic to specific ports based on the VLAN number and the destination MAC address of the frame. When no entry corresponds to the frame destination MAC address in the incoming VLAN, the frame (unicast) is sent to all forwarding ports within the respective VLAN. This process can result in unicast flooding.
To avoid unicast flooding on Cisco Catalyst switches, create a static CAM entry in the MAC address table for the paticular host that seems to be causing the issue. Unicast flooding can also be stopped if unicast flood blocking is configured on all the ports.