SMC Networks SMC6724L2 Installation Manual page 28

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ETWORK LANNING
When you expand port-based VLANs across several switches, you
need to make a separate connection for each VLAN group. This
approach is, however, inconsistent with the Spanning Tree
Protocol, which can easily segregate ports that belong to the same
VLAN. When VLANs cross separate switches, it is therefore better
to use VLAN tagging. This allows you to assign multiple VLAN
groups to the "trunk" ports (that is, tagged ports) connecting
different switches.
Figure 2-3. Making VLAN Connections
Note: When connecting to a switch that does not support IEEE
802.1Q VLAN tags, use untagged ports.
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