Trunking with 802.1Q
One problem with having two users in the same VLAN but not on the same physical switch is how SW1 tells SW2 that a broadcast or unicast frame is supposed to be for VLAN 10. The answer is simple. For connections between two switches that contain ports in VLANs that exist in both switches, you configure specific trunk ports instead of configuring access ports. If the two switch ports are configured as trunks, they include additional information called a tag that identifies which VLAN each frame belongs to. 802.1Q is the standard protocol for this tagging. The most critical piece of information (for this discussion) in this tag is the VLAN ID.
Currently, the two users cannot communicate because they are in the same VLAN (VLAN ...
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