D-Link DGS-3308 Series, User Manual

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8-port Gigabit Ethernet Switch User’s Guide
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Port Group Spanning Tree Settings
In addition to setting Spanning Tree parameters for use on the switch level, the DGS-3308 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.
Note: 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 .
Note: 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
.
Note: It is advisable to define an STP Group to correspond to a VLAN group of ports.
To define which ports will be members of an STP Group, highlight STP Group Configuration and press Enter .
Figure 6-63. STP Group Configuration screen
Toggle the Action:< Add/Modify > field to Add/Modify . Choose a name for the group and enter it in the Group
Name:[ ] field. The group name does not necessarily have to correspond to any name that has been previously
entered in the Switch’s configuration. Set the membership of the group by pressing the letter M for each desired port in the
Membership (M/): [ ]
field.
Now highlight
STP Port Settings
on the
Configure Spanning Tree
screen and press
Enter
. The following screen
is displayed: