Configure Switching Information 
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 M4300 Series and M4300-96X Fully Managed Switches User Manual
Configure CST Settings
You can configure Common Spanning Tree (CST) and Internal Spanning Tree on the switch. 
 To configure CST settings:
1.  Launch a web browser.
2.  In the address field of your web browser, enter the IP address of the switch.
The login window opens.
3.  Enter the user name and password. 
The default admin user name is 
admin and the default admin password is blank, that is, 
do not enter a password.
4.  Click the Login button. 
The System Information page displays.
5.  Select Switching > STP > 
Advanced > CST Configuration.
6.  Specify values for CST in the appropriate fields:
• Bridge Priority. When switches or bridges are running STP, each is assigned a 
priority. After exchanging BPDUs, the switch with the lowest priority value becomes 
the root bridge. Specifies the bridge priority value for the Common and Internal 
Spanning Tree (CST). The valid range is 0–61440. The bridge priority is a multiple of 
4096. If you specify a priority that is not a multiple of 4096, the priority is automatically