Switching
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XS728T ProSAFE 28-Port 10-Gigabit L2+ Smart Switch
• BPDU Forwarding. Specifies whether spanning tree BPDUs should be forwarded
while spanning-tree is disabled on the switch. Select Enable or Disable.
• Port State. The forwarding state of this port. This field is read-only.
• Path Cost. Set the Path Cost to a new value for the specified port in the Common
and Internal Spanning Tree. The valid range is 1–200000000.
• Priority. The priority for a particular port within the CST. The port priority is set in
multiples of 16.
• 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 Apply to send the updated configuration to the switch.
Configuration changes take place immediately.
CST Port Status
To display Common Spanning Tree (CST) and Internal Spanning Tree on a specific port on
the switch, use the CST Port Status screen.
To display the CST Port Status screen:
1. Select Switching > STP > Advanced > CST Port Status.
2. To view CST settings for an interface, click PORTS, LAGS, or All.
The following table describes the CST Status information displayed on the screen..
Field Description
Interface Select a physical or port channel interface to configure. The port is
associated with the VLANs 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 can be one of the following values: Root,
Designated, Alternate, Backup, Master, or Disabled.
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.
Edge Port Indicates whether the port is active as an edge port. Possible values are
True and False.
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