Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 165 of 669
Path Cost
Controls the path cost incurred by the port (dropdown and entry field).
The
Auto
setting will set the path cost as appropriate by the physical link speed, using the 802.1D
recommended values. This is the default setting.
The
Specific
setting lets you define the Path Cost value in the entry box. 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 in the range of 1 to 200,000,000. If
Specific
is selected at the dropdown, you must enter a Path Cost value in the entry field.
Priority
Controls the port priority. This can be used to control priority of ports having identical Path Costs (see
above). Select 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, or 240. The default is
128
.
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 Admin Edge and Auto Edge 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). Select
Edge
or
Non-Edge
. The default is
Edge
.
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. The default is automatic
edge detection on the bridge port enabled (checkbox checked).
Restricted Role
If checked, 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
. The default is unchecked.
Restricted TCN
If checked, 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 that the attached LANs transits frequently. The default is
unchecked.
BPDU Guard
If checked, 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. The default is unchecked.
A port entering error-disabled state due to this setting is subject to the bridge ‘Port Error Recovery’
setting as well. See the “Port Error Recovery” field description in the “
” section on
page
