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why each port of switch need a mac address?

Each port of hub doesn't have a mac address,but each port of switch do have a mac address ,why each port of switch need a mac address? And in spanning tree protocol,the mac address is one part of bridge id,but because there are several mac address in a switch,so which port's mac address becomes the bridge id?

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Re: why each port of switch need a mac address?

The bridge ID is 8 bytes - 2 bytes are the bridge priority and 6 bytes are the mac address. Some Catalysts pull the mac address from the sup mod (eg cat5000s), while others pull the mac from the backplane (eg cat5500 and cat6000s). It will be the lowest mac address from there.

Steve

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