D-Link DES-3326S manual Cost, Priority, 273

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

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.

Web-Based Switch Management 273