Application Guide

[116]
Software User's
Manual
–
Version 3.0
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 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 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 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 medi
a.