D-Link DES-3250TG User Manual page 108

DES-3250TG Layer 2 Fast Ethernet Switch User's Guide
Figure 6- 21. STP Port Settings window
In addition to setting Spanning Tree parameters for use on the
switch level, the switch allows for the configuration of a group
of ports. This STP Group will use the switch-level parameters
entered above, with the addition of Port Priority and Port Cost.
The 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.
The STP on the switch level blocks redundant links between
switches (and similar network devices). The port level STP will
block redundant links within the STP Group.
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