Black Box LPB2910A User Manual page 119

Priority:

Controls the port priority. This can be used to control priority of ports having identical port cost
(see a bove).
operEdge ( state f lag):

Operational flag describing whether the port is connecting directly to edge devices (no bridges
attached). T ransition t o t he f orwarding s tate i s f aster f or e dge p orts ( that h ave o perEdge t rue) t han
for other ports. The value of this flag is based on AdminEdge and AutoEdge fields. This flag is
displayed a s E dge i n M onitor-­‐>Spanning T ree -­‐ > S TP D etailed B ridge S tatus.
 AdminEdge:
Controls whether the operEdge flag should start as set or cleared. (Set the initial operEdge state
when a p ort i s i nitialized).
AutoEdge:

Controls whether the bridge should enable automatic edge detection on the bridge port. This
allows o perEdge t o b e d erived f rom w hether B PDUs a re r eceived o n t he p ort o r n ot.
Restricted R ole:

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 P ort h as b een s elected. I f s et, i t c an c ause a l ack o f s panning t ree c onnectivity. I t c an b e s et b y
a network administrator to prevent bridges external to a core region of the network influence the
spanning t ree a ctive t opology, p ossibly b ecause t hose b ridges a re n ot u nder t he f ull c ontrol o f t he
administrator. T his f eature i s a lso k nown a s R oot G uard.
Restricted T CN:

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. I t i s s et b y a n etwork a dministrator t o p revent b ridges e xternal t o a c ore r egion o f t he
network, c ausing a ddress f lushing i n t hat r egion, p ossibly b ecause t hose b ridges a re n ot u nder t he
full control of the administrator, or the physical link state of the attached LANs transmits
frequently.
BPDU G uard:

If enabled, causes the port to disable itself upon receiving valid BPDUs. Contrary to the similar
bridge s etting, t he p ort E dge s tatus d oes n ot a ffect t his s etting. A p ort e ntering e rror-­‐disabled s tate
because o f t his s etting i s s ubject t o t he b ridge P ort E rror R ecovery s etting.
Point t o P oint

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 f aster f or p oint-­‐to-­‐point L ANs t han f or s hared m edia.
Buttons

Apply – C lick t o s ave c hanges.
Reset-­‐ C lick t o u ndo a ny c hanges m ade l ocally a nd r evert t o p reviously s aved v alues.
107
Publication date: Sept, 2015
Revision A1