![]() Only this MAC address is then allowed to forward traffic over switch port (only one trusted MAC is allowed by default). ![]() When enabled, MAC address of the device connected to the port, is dynamically learned by the switch and stored in a memory (by default it is not aged out). ![]() Port Security is a Layer 2 feature, which can be enabled on an interface, to prevent devices with untrusted MAC address, from accessing a switch interface. ![]() In Cisco ME 2600X, the default value for aging the MAC address is 300 seconds or 5 minutes.How to prevent unauthorized users from connecting their PCs to an enterprise network? How to prevent employees from connecting unauthorized devices to a LAN or moving their computers without permission? This releases unused MAC addresses from the MAC address table for other active subscribers. The dynamically learned addresses are removed from the MAC Table after the MAC address age value has expired. Switch already knows the MAC addresses of the participants, so doesn't need to flood data packets and actual data transfer happens. When the Switch gets the reply back from the particular destination (4) the Switch will learn its MAC address and update its MAC address table with the destination MAC address-5. Switch broadcasts the frame using destination MAC ff:ff:ff:ff:ff:ff, to all ports (3), except the port on which the frame was received, if the destination MAC address is not found in the MAC address table (unknown). When Switch receives a frame (1), it updates its MAC address table with the source MAC address and the port on which it received the frame (2). The Switch stores the MAC table in the RAM. In the dynamic option, the Switch learns and adds the MAC addresses in the MAC table automatically. In the manual option, we have to add the MAC addresses in the CAM or MAC table manually. ![]() A Switch can learn MAC address in two ways manually or dynamically. ![]()
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