User manual

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
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Figure 7- 29. STP Port Settings window
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 based on 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 STP Port Settings fields can be set: