User's Manual

Chapter 12: Setting Switch Spanning Tree Protocols
142
Modifying Switch Spanning Tree Protocol Settings
To modify port settings for Spanning Tree Protocol, do the following:
1. Select the Switching tab.
The Switching tab is displayed. See Figure 19 on page 58.
2. From the Switching tab, select Spanning Tree.
The Switch Spanning Tree Settings page is displayed. See Figure 48
on page 139.
3. Change the following settings as needed:
 Active Protocol— Indicates if the active spanning tree protocol is
STP or RSTP. The default setting is RSTP.
 Status— Indicates if the spanning tree protocol is enabled or
disabled on the switch.
 Current Priority— By default, the current priority is set to 32,768.
You cannot change this field.
 New Priority (0-15)— Assigns the switch a priority number. The
device that has the lowest priority number in the spanning tree
domain becomes the root bridge. If two or more devices have the
same priority value, the device with the numerically lowest MAC
address becomes the root bridge.
The range is 0 to 61,440, in increments of 4,096. The range is
divided into the sixteen increments listed in Table 2. You specify
the increment that represents the desired bridge priority value. The
default value is 32,768 (increment 8).
Table 3. STP Bridge Priority Value Increments
Increment
Bridge
Priority
Increment
Bridge
Priority
00832768
1 4096 9 36864
2 8192 10 40960
3 12288 11 45056
4 16384 12 49152
5 20480 13 53248
6 24576 14 57344