![]() ![]() In this entire process, there is neither a place nor a need for a switch to have its own MAC address, and in fact, the cheap small unmanaged switches from many vendors truly do not have any MAC address assigned - they do not need any. In order for this to happen, a switch has to learn MAC addresses of attached stations by observing the Source MAC addresses of incoming frames, and forward the frames based on their Destination MAC address. The primary function of a switch is to forward frames based on their destination address so that in ideal case, they are forwarded only out the port that truly leads to the intended destination, and only if the destination is unknown or is a group of receivers (multicasts, broadcasts), the frame is replicated out all ports except the one that the frame came in through. Your answer would be appreciated on this.Īlthough Cisco Catalyst switches have their own MAC addresses, you should be aware that for the elementary switching function of a switch, it does not need any own MAC addresses. I have came across some article that individual mac of the port(not the learned mac address) is used for unicast bpdu communication within switches.ġ)Why switches not show both the learned as well as the actual port mac in mac-address table.Ģ)How switches knows on which mac(I mean the mac that learned from attached devices or its own port mac) it should send bpdu.ģ)Is it correct if I say switches(layer 2) uses its own mac address only for sending and receiving bpdu. Now as per my understanding port f0/1 and port f0/2 both have their own mac address as well as it will have the mac address of attached device on port f0/1 and f0/2. ![]() Host1 is connected with the switch SWA port f0/1 and host2 is connected with switch SWB on port f0/2 We all know every switch port have already mac address associated with their port. Please insight me on my queries regarding the switch port.
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