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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
In addition to setting Spanning Tree parameters for use on the switch level, the DES-3326 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
View Ports:< >
This field can be toggled using the
space bar between 1 to 12, 13 to 24,
and 25-26. This is used to select the
range of ports displayed in the
console.
Configure Ports:[
] to [ ]
Allows the entry of a range of port
numbers to be configured.
Port 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.
Link Aggregation
To configure a link aggregation group, highlight Link Aggregation on the Main Menu and press Enter.
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