Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
139
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473
Parameter descriptions
:
Port
: The switch port number of the logical STP port.
STP Enabled
: Controls whether STP is enabled on this switch port. This field will be read only if Voice VLAN
feature is enabled. The Voice VLAN port mode will be read only if this field be Enabled.
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 1 to 200000000.
Priority
: Controls the port priority. This can be used to control priority of ports having identical port cost. (See
above).
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 BPDUs 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 called 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 BPDUs. Contrary to the similar
bridge setting, the port Edge status does not affect this setting. A port entering error-disabled state due to this
setting is subject to the bridge Port Error Recovery setting as well.
Point to Point
: Controls whether the port connects to a point-to-point LAN rather than to a shared medium.
This can be automatically determined or forced either true or false. Transition to the forwarding state is faster
for point-to-point LANs than for shared media.
Buttons
Apply
: Click to save changes.
Reset
: Click to undo any changes made locally and revert to previously saved values.
