User Manual

Configuring Switching Information
164
M6100 Web Management User Guide
MST Port Status
Use the Spanning Tree MST Port Status page to 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 display the Spanning Tree MST Port Status page, click Switching
 STP  Advanced 
MST Port Status.
Note: If no MST instances have been configured on the switch, the page
displays a “No MSTs Available” message and does not display the
fields shown in the field description table that follows.
To configure MST port settings:
1. Use MST ID to select one MST instance from existing MST instances.
2. Use Interface to select one of the physical or port channel interfaces associated with VLANs
associated with the selected MST instance.
3. Use Port Priority to specify the priority for a particular port within the selected MST
instance.
The port priority is set in multiples of 16. For example if the priority is attempted to
be set to any value between 0 and 15, it will be set to 0. If it is tried to be set to any value
between 16 and (2*16-1) it will be set to 16 and so on.
4. Use Port Path Cost to set the Path Cost to a new value for the specified port in the selected
MST instance. It takes a value in the range of 1 to 200000000.
5. Click Apply to send the updated configuration to the switch. Configuration changes take
ef
fect immediately.
6. Click Cancel to cancel the configuration on the screen and reset the data on the screen to
the latest value of the switch.
The following table describes the read-only MST port configuration information displayed on
the Spanning
Tree CST Configuration page.