Switching
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XS728T ProSAFE 28-Port 10-Gigabit L2+ Smart Switch
2. Select the MST instance to be configured from the Select MST field.
3. To view CST settings for an interface, click PORTS, LAGS, or All.
4. Select the check box next to the port or LAG to configure.
You can select multiple ports and LAGs to apply the same setting to the selected
interfaces. Select the check box in the heading row to apply the same settings to all
interfaces.
5. Configure the MST values for the selected ports or LAGs:
• Port Priority. The priority for a particular port within the selected MST instance. The
port priority is set in multiples of 16. The valid range is 0–240.
• Port Path Cost. Set the path cost to a new value for the specified port in the selected
MST instance. The valid range is 0–200000000. If you enter 0, the device
recalculates the path cost.
6. Click Apply to send the updated configuration to the switch.
Configuration changes take place immediately.
The following table describes the read-only MST port configuration information displayed on
the CST Configuration screen:.
Field Description
Auto Calculated Port Path
Cost
Displays that the path cost is not automatically calculated (Disabled). Path
cost is recalculated based on the link speed of the port if the configured
value for Port Path Cost is 0.
Port ID The port identifier for the specified port within the selected MST instance. It
is made up from the port priority and the interface number of the port.
Port Mode Spanning Tree Protocol Administrative Mode associated with the port or port
channel. Possible values are Enable and Disable.
Port Forwarding State Indicates the current STP state of a port. If enabled, the port state
determines what forwarding action is taken on traffic. Possible port states
are:
• Disabled. STP is disabled on the port. The port forwards traffic while
learning MAC addresses.
• Blocking. The port is blocked and cannot be used to forward traffic or
learn MAC addresses.
• Listening. The port is in the listening mode. The port cannot forward
traffic or learn MAC addresses.
• Learning. The port is in the learning mode. The port cannot forward
traffic, however, it can learn new MAC addresses.
• Forwarding. The port is in the forwarding mode. The port can forward
traffic and learn new MAC addresses
Port Role Each MST bridge port that is enabled is assigned a port role for each
spanning tree. The port role is one of the following values: Root, Designated,
Alternate, Backup, Master, or Disabled.
Designated Root Root bridge for the selected MST instance. It is made up using the bridge
priority and the base MAC address of the bridge.
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