Configure Switching Information
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M4300 Series and M4300-96X Fully Managed Switches User Manual
For each configured instance, the information described in the following table displays on the
page.
View the Spanning Tree MST Port Status
You can configure and display Multiple Spanning Tree (MST) settings on a specific port on
the switch.
A port can become Diagnostically Disabled (D-Disable) when DOT1S experiences a severe
error condition. The most common cause is when the DOT1S software experiences BPDU
flooding. The flooding criteria is such that DOT1S receives more than 15 BPDUs in a
3-second interval. The other causes for DOT1S D-Disable are extremely rare.
To view the Spanning Tree MST port status:
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 > MST Port Status.
Table 78. MST Configuration
Field Description
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 The time n seconds since the topology of the selected MST instance
last changed.
Topology Change Count Number of times topology changed for the selected MST instance.
Topology Change The value of the topology change parameter for the switch indicating if
a topology change is in progress on any port assigned to the selected
MST instance. It takes a value if
T
rue or False.
Designated Root The bridge identifier of the root bridge. It is made up from the bridge
priority and the base MAC address of the bridge
Root Path Cost Path Cost to the Designated Root for this MST instance.
Root PortIdentifier Port to access the Designated Root for this MST instance.
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