Netgear XCM89UP User Manual Software Version 11.x - Page 236

M6100, M5300, and M7100 Series Managed Switches Table 87. STP Advanced CST Configuration Field Topology change Designated root Root Path Cost Root Port Identifier Max Age(secs) Forward Delay(secs) Hold Time(secs) CST Regional Root CST Path Cost Description 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. The bridge identifier of the root bridge. It is made up from the bridge priority and the base MAC address of the bridge. Path Cost to the Designated Root for the CST. Port to access the Designated Root for the CST. Path Cost to the Designated Root for the CST. Derived value of the Root Port Bridge Forward Delay parameter. Minimum time between transmission of Configuration BPDUs. Priority and base MAC address of the CST Regional Root. Path Cost to the CST tree Regional Root. 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. Configure Switching Information 236