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STG tab

In the STG tab, you can view the status and configuration of a port's spanning tree group (STG) parameters. By double clicking on the white fields, you can change the configuration. When you select multiple ports to edit, the spanning tree options are not displayed.


Note Note: When you edit multiple ports, the spanning tree options are not displayed.


Field Description
StgId
ID number of the Spanning Tree Group.
Priority
The value of the priority field that is contained in the first (in network byte order) octet of the (2-octet long) Port ID. The other octet of the Port ID is given by the value of dot1dStpPort.
State
The port's current state as defined by application of the Spanning Tree Protocol. This state controls what action a port takes on reception of a frame. If the bridge has detected a port that is malfunctioning, it will place that port into the broken state. For ports that are disabled (see EnableStp), this object will have a value of disabled.
EnableStp
The enabled/disabled spanning tree status of the port, which will affect only the operation of the Spanning Tree Protocol on the port. Disabling STP at the spanning tree group will take precedence over what is configured here.
FastStart
When FastStart is true, the port is enabled in the Forwarding state upon being enabled. If the port receives a spanning tree BPDU, the port will start normal STP negotiations.
PathCost
The contribution of this port to the cost of paths toward the spanning tree root, which include this port. The IEEE 802.1D-1990 standard recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN.
DesignatedRoot
The unique Bridge Identifier of the bridge recorded as the Root in the Configuration BPDUs transmitted by the Designated Bridge for the segment to which the port is attached.
DesignatedCost
The path cost of the Designated Port of the segment connected to this port. This value is compared to the Root Path Cost field in received bridge PDUs.
DesignatedBridge
The Bridge Identifier of the bridge that this port considers to be the Designated Bridge for this port's segment.
DesignatedPort
The Port Identifier of the port on the Designated Bridge for this port's segment.
ForwardTransitions
The number of times this port has transitioned from the Learning state to the Forwarding state.


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