• Author : Sahil

 
 

Troubleshooting Unknown Unicast Flooding

This article covers some of the scenarios in which the switch will flood Unknown Unicast traffic.  Unknown unicast flooding is observed when traffic received is destined to MAC addresses not learned on the switch. Since MAC addresses are usually learned from the source MAC for the host, switches could either : Never learn the MAC address if we never receive a packet with that source MAC address Time out such MAC addresses if we do not receive traffic with that source MAC for a duration greater than the MAC address timeout interval. Flush MAC addresses on receiving an STP TCN...
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