User Manual

Configure Switching
137
Insight Managed 8-Port Gigabit Ethernet Smart Cloud Switch with 2 SFP Fiber Ports
The following table describes the read-only MST port configuration information displayed on
the Spanning Tree CST Configuration page.
Table 37. MST port status information
Field Description
Operational Port Path Cost The operational path cost for the port in the MST instance.
Auto-calculated Port Path
Cost
Indicates whether the path cost is automatically calculated (Enabled) or not
(Disabled). If the configured value for the port path cost is zero, the path cost is
calculated based on the link speed of the port.
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 Up Time Since Counters
Last Cleared
The time since the counters were last cleared, displayed in days, hours,
minutes, and seconds.
Port Mode The Spanning Tree Protocol administrative mode that is associated with the port
or port channel. The 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 as follows:
• Disabled. STP is currently disabled on the port. The port forwards traffic
while learning MAC addresses.
• Blocking. The port is currently blocked and cannot be used to forward
traffic or learn MAC addresses.
• Listening. The port is currently in the listening mode. The port cannot
forward traffic nor can it learn MAC addresses.
• Learning. The port is currently in the learning mode. The port cannot
forward traffic. However, it can learn new MAC addresses.
• Forwarding. The port is currently 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: Root Port, Designated Port, Alternate
Port, Backup Port, Master Port, or Disabled Port.
Designated Root The root bridge for the selected MST instance. It is made up using the bridge
priority and the base MAC address of the bridge.
Designated Cost The 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 The 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 The 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.