From that moment all traffic destined to that host will be forwarded only to the port where destination MAC address is present in CAM table. If switch receives return traffic from host that is receiver of traffic on any of its ports switch will learn direction in which host is located and unicast flooding will stop. Since switch has no idea where end host with specific MAC address is located frame will be sent to all ports in the same broadcast domain except the port where the frame is received. Unicast flooding is happening in situation when switch receives frame with unknown destination MAC address (switch has no MAC address present in MAC address table (CAM table) on any port). ![]() In Windows hosts (I removed extra routes for simplicity): Broadcast traffic is as it is already established previously sending traffic to MAC address (L2 broadcast) or to IP address 255.255.255.255 (元 broadcast) or to subnet broadcast address (for example 192.168.0.255 for subnet 192.168.0.0/24 if default broadcast address is not changed).
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