Enterasys VH-2402-L3 Management Manual page 86

Figure 1-60. STP Port Settings
Toggle the View Ports:< > field to the range of ports to
be configured. The Fast Ethernet ports displayed for
configuration in groups of 12 and the two (optional) Gigabit
Ethernet ports are displayed together.
In addition to setting Spanning Tree parameters for use on
the switch level, the VH-2402-L3 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.
78 VH-2402-L3 Management Guide 9033691-01