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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Web-Based Switch Management 273
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.
The STP on the switch level blocks redundant links between
switches (and similar network devices). The port level STP will
block redundant links within an STP Group.
It is advisable to define an STP Group to correspond to a VLAN
group of ports.
The following fields can be set:
Parameter Description
Cost
A Port Cost can be set from 1 to
65535. The lower the number, the
greater the probability the port will
be chosen to forward packets.
Priority
A Port Priority can be from 0 to 255.
The lower the number, the greater
the probability the port will be
chosen as the Root Port.