User Guide

Configuring Switching
102
GS716Tv3, GS724Tv4, and GS748Tv5 Smart Switches
• Port ID. The port identifier for the specified port within the CST. It is made up from the
port priority and the interface number of the port.
• Hello Timer. Specifies the switch Hello time, which indicates the amount of time in
seconds a port waits between configuration messages. The value is fixed at 2
seconds.
5. Click the Apply button.
CST Port Status
Use the Spanning Tree CST Port Status screen to display Common Spanning Tree (CST)
and Internal Spanning Tree on a specific port on the switch.
To display the Spanning Tree CST Port Status screen, click Switching > STP > Advanced >
CST Port Status.
The following table describes the CST Status information displayed on the screen.
Table 25. CST port status information
Field Description
Interface The port associated with the VLAN(s) associated with the CST.
Port Role Each MST bridge port that is enabled is assigned a port role for each
spanning tree. The port role will be one of the following values: Root
Port, Designated Port, Alternate Port, Backup Port, Master Port, or
Disabled Port.
Designated Root Root Bridge for the CST. It is made up using the bridge priority and the
base MAC address of the bridge.
Designated Cost Displays cost of the port participating in the STP topology. Ports with a
lower cost are less likely to be blocked if STP detects loops.
Designated Bridge Bridge Identifier of the bridge with the designated port. It is made up
using the bridge priority and the base MAC address of the bridge.
Designated Port Port Identifier on the designated bridge that offers the lowest cost to the
LAN. It is made up from the port priority and the interface number of the
port.
Topology Change
Acknowledge
Identifies whether the next BPDU to be transmitted for this port would
have the topology change acknowledgement flag set. It is either True or
False.
Edge Port Indicates whether the port is enabled as an edge port. Possible values
are Enabled or Disabled.
Point-to-point MAC Derived value of the point-to-point status.
CST Regional Root The bridge priority and base MAC address of the CST regional root.