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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 favour 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).
Lower priority is better.
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
operEdgetrue
) 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, 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
If enabled, causes the port not to propagate received topology change notifications and topology changes to
other ports. If set it can cause temporary loss of connectivity after changes in a spanning tree's active topology
as a result of persistently incorrect learned station location information. It is set by a network administrator to
prevent bridges external to a core region of the network, causing address flushing in that region, possibly
because those bridges are not under the full control of the administrator or the physical link state of the
attached LANs transits frequently.
BPDU Guard
If enabled, causes the port to disable itself upon receiving valid BPDU's. Contrary to the similar bridge setting,
the port
Edge
status does not effect this setting.
