Figure 3-4.4: The STP CIST Port Configuration (GS-2310P)
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, a user-defined value can be entered. 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 priority of ports having identical port cost. (See above).
operEdge (state flag):
Operational flag describing 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 state 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 BPDU's are received on the port or not.
Restricted Role:
If enabled, causes the port not to be selected as Root Port for the CIST or any MSTI, even if it has the best spanning tree
priority vector. Such a port will be selected as an Alternate Port after the Root Port has been selected. If set, it can cause
lack of spanning tree connectivity. It can be set by a network administrator to prevent bridges external to a core region
of the network influence the spanning tree active topology, possibly because those bridges are not under the full control
of the administrator. This feature is also known as Root Guard.
Restricted TCN:
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LANCOM GS-2310P/GS-2326(P) User Manual
3 Configuration
