Configuring Spanning Tree Protocol
D-Link Unified Wired and Wireless Access System
Oct. 2015 Page 248
D-Link UWS User Manual
• If you make any configuration changes, click Submit to apply the new settings to the switch.
• Click Force to force the port to send out 802.1w or 802.1D BPDUs.
• Click Refresh to update the screen with most recent data.
Table 134: Spanning Tree MST Configuration/Status
Field Description
MST Use the drop-down menu to create and configure a new MST or select an existing MST to
display or configure.
MST ID This is only visible when Create is selected from the MST field drop-down menu. The ID of
the MST being created. Valid values for this are between 1 and 4094.
Priority Specifies the bridge priority value for the MST. When switches or bridges are running , each
is assigned a priority. After exchanging BPDUs, the switch with the lowest priority value
becomes the root bridge. The bridge priority is a multiple of 4096. If you specify a priority
that is not a multiple of 4096, the priority is automatically set to the next lowest priority
that is a multiple of 4096. For example if the priority is attempted to be set to any value
between 0 and 4095, it will be set to 0. The default priority is 32768.The valid range is 0-
61440.
VLAN ID This gives a list box of all VLANs on the switch. The VLANs associated with the MST instance
which is selected are highlighted on the list. These can be selected or unselected for
reconfiguring the association of VLANs to MST instances.
Bridge Identifier The bridge identifier for the selected MST instance. It is made up using the bridge priority
and the base MAC address of the bridge.
Time Since
Topology Change
Displays the total amount of time since the last topographic change. The time is displayed
in hour/minute/second format, for example, 5 hours 10 minutes and 4 seconds.
Topology
Changes Counts
Displays the total number of MST state changes that have occurred.
Topology Change Indicates whether a topology change is in progress on any port assigned to the CST. The
possible values are True or False.
Designated Root Displays the bridge identifier of the root bridge, which is made up from the bridge priority
and the base MAC address of the bridge.
Root Path Cost Displays the path cost to the Designated Root for this MST instance.
Root Port Indicates the port to access the Designated Root for this MST instance.
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