25
Chapter 6: Ports Tab
TOUGHSwitch
™
PoE User Guide
Ubiquiti Networks, Inc.
Spanning Tree Settings for Port
STP settings are available per port if STP is enabled on the
Device
tab (see
“Spanning Tree Protocol” on page 21
).
Edge Port
If enabled, designates this port as a port that
connects to only a host device. The host device must not
be connected to another switch or router. The
Edge Port
is
always in the forwarding state and never undergoes the
learning or blocking state.
Note:
Ensure that the
Edge Port
is connected to
only a host device. If the
Edge Port
is connected to
a switch or router (even indirectly through a host
device), then this may cause a network loop.
Path Cost
The lower the value, the better. STP uses the
Path Cost
to determine the best path between devices.
In most cases, specify lower values for ports with higher
bandwidths, such as gigabit speeds, and specify higher
values for ports with lower bandwidth. You can also
specify lower values for ports you prefer to use. (
Path Cost
supersedes
Priority
.) The default is
0
.
Priority
The lower the value, the better. STP uses the
Priority
as a tiebreaker. If the
Path Cost
of multiple ports
are the same, then STP chooses the port with the highest
Priority
(lowest value) as the active port (the others are
blocked). If STP detects a network loop, then a port with
higher
Priority
is less likely to be blocked. If multiple ports
share the highest
Priority
, then STP enables the port with
the lowest port ID. The
Priority
range is 0 (highest priority)
to 255 (lowest priority).The default is
128
.
Configure Alerts for Port
If you configure alerts, the alerts display on the
Alerts
tab;
see
“Alert Log” on page 28
.
For each port, you can configure the following alerts:
Link Goes Up/Down
Generates an alert when the link
goes up or down.
RX Bandwidth Goes Above
Generates an alert when the
RX bandwidth exceeds the specified maximum. Enter the
maximum in Mbps.
RX Bandwidth Goes Below
Generates an alert when the
RX bandwidth drops below the specified minimum. Enter
the minimum in Mbps.
TX Bandwidth Goes Above
Generates an alert when the
TX bandwidth exceeds the specified maximum. Enter the
maximum in Mbps.
TX Bandwidth Goes Below
Generates an alert when the
RX bandwidth drops below the specified minimum. Enter
the minimum in Mbps.
