User manual

APS User Manual
95
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.
Admin Edge: The Admin Edge function allows ports to be configured as Edge or Non-Edge
ports. When set to an Edge Port the transition to the forwarding state is
faster than Non-Edge ports. A port should be set as an Edge port if there are
no other Bridges attached to this port. E.g. no STP enabled devices
connected.
Auto Edge: Controls whether the bridge should enable automatic edge detection on the
bridge port.
Restricted Role: If enabled, the port cannot be selected as a 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
influencing 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, the port will not 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 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.