Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Softwarehandbuch

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.

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Prepare your computer with a static IP address in the 169.254.100.0 subnet, for 

example, 169.254.100.201.

Connect an Ethernet cable from an Ethernet port on your computer to an Ethernet port on 

the switch.

Launch a web browser.

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.

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.

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.