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24-port NWay Ethernet Switch User’s Guide
Switch Management Concepts
47
When switches maintaining the same VLANs are 802.1Q-
compliant, it is possible to use tagging. Tagging puts
802.1Q VLAN information into each packet header,
enabling other 802.1Q-compliant switches that receive the
packet to know how to treat it. Upon receiving a tagged
packet, an 802.1Q-compliant switch can use the
information in the packet header to maintain the integrity
of VLANs, carry out priority forwarding, etc.
Data transmissions between 802.1Q-compliant switches
take place as shown below.