Black Box LGB5128A Network Hardware User Manual


 
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Figure 3-4.4: The STP CIST Port Configuration
Parameter description:
Port :
The switch port number of the logical STP port.
STP Enabled :
Controls whether STP is enabled on this switch port.
Path Cost :
Controls the path cost incurred by the port. The Auto setting will set the path
cost as appropriate by the physical link speed, using the 802.1D recommended
values. Using the Specific setting, you can enter a user-defined value. The path
cost is used when establishing the active topology of the network. Lower path
cost ports are chosen as forwarding ports in favor of higher path cost ports.
Valid values are in the range 1 to 200000000.
Priority :
Controls the port priority. This can be used to control the priority of ports
having an identical port cost. (See above).
operEdge (state flag) :
Operational flag describes whether the port is connecting directly to edge
devices (no Bridges attached). Transition to the forwarding state is faster for
edge ports (having operEdge true) than for other ports. The value of this flag is
based on AdminEdge and AutoEdge fields. This flag is displayed as Edge in
Monitor->Spanning Tree -> STP Detailed Bridge Status.
AdminEdge :
Controls whether the operEdge flag should start as set or cleared. (The initial
operEdge states when a port is initialized.)
AutoEdge :
Controls whether the bridge should enable automatic edge detection on the
bridge port. This allows operEdge to be derived from whether BPDUs are
received on the port or not.