D-Link DES-3326SR User Manual page 285

DES-3326SR Layer 3 Fast Ethernet Switch User's Guide
Figure 6 - 98. Edit STP Port Settings
In addition to setting Spanning Tree parameters for use on the
switch level, the switch allows for the configuration of groups of
ports, each port-group of which will have its own spanning tree,
and will require some of its own configuration settings. An STP
Group will use the switch-level parameters entered above, with
the addition of Port Priority and Port Cost.
An STP Group spanning tree works in the same way as the
switch-level spanning tree, but the root bridge concept is
replaced with a root port concept. A root port is a port of the
group that is elected on the basis of port priority and port cost,
to be the connection to the network for the group. Redundant
links will be blocked, just as redundant links are blocked on
the switch level.
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