3Com WX1200 Reference Manual page 213

2 In the Content panel, select the VLAN.
3 In the Task List panel, select Configure Spanning Tree.
This wizard configures STP features for an individual VLAN but does not
configure fast convergence features, which are global. (See "Enabling STP
Fast Convergence Features" on page 215.)
4 To enable STP, click Enabled.
5 In the Bridge Priority box, specify this STP bridge's priority (0 to 65,535).
The default is 32,768.
The bridge with the lowest priority value becomes the root bridge for the
spanning tree.
6 In the Max Age box, specify the maximum age value (6 to 40 seconds),
which controls how long information from other bridges is kept. The
default is 20 seconds.
7 In the Hello Time box, specify the interval (1 to 10 seconds) between each
configuration message from the root bridge. The default is 2 seconds.
8 In the Forward Delay box, specify the amount of time (4 to 30 seconds) a
bridge waits after a topology change to begin forwarding data packets.
The default is 15 seconds.
9 Click OK.
Changing STP Port Settings in a VLAN
1 Access the VLAN table:
a Select the Configuration tool bar option.
b In the Organizer panel, click the plus sign next to the WX switch.
c Click the plus sign next to System.
d Select VLANs.
2 In the Content panel, select the VLAN.
3 Click Properties.
4 Click the Spanning Tree Ports tab.
5 To enable spanning tree packet processing (Tx/Rx) on that port, make
sure Enabled is selected. This is the default.
To disable this feature, clear Enabled. If you disable spanning tree packet
processing on the port, the following might happen:
Viewing and Configuring VLANs 213