User Manual

Configure Switching Information
236
M6100, M5300, and M7100 Series Managed Switches
Configure CST Port Settings
You can configure the Common Spanning Tree (CST) and Internal Spanning Tree 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 configure CST port settings:
1. Prepare your computer with a static IP address in the 169.254.100.0 subnet, for
example, 169.254.100.201.
2. Connect an Ethernet cable from an Ethernet port on your computer to an Ethernet port on
the switch.
3. Launch a web browser.
4. Enter the IP address of the switch in the web browser address field.
The default IP address of the switch is 169.254.100.100.
The Login screen displays.
5. 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.
6. Click the Login button.
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 CST. It
takes a value if True 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 the CST.
Root Port Identifier Port to access the Designated Root for the CST.
Max Age(secs) Path Cost to the Designated Root for the CST.
Forward Delay(secs) Derived value of the Root Port Bridge Forward Delay parameter.
Hold Time(secs) Minimum time between transmission of Configuration BPDUs.
CST Regional Root Priority and base MAC address of the CST Regional Root.
CST Path Cost Path Cost to the CST tree Regional Root.
Table 87. STP Advanced CST Configuration
Field Description