Black Box LPB2910A, User Manual

Page: 119 / 367

Publication date: Sept, 2015
Revision A1
107

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 (that have 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. (Set 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 a 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 transmits
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
because of this setting is subject to the bridge Port Error Recovery setting.

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.