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Ubiquiti TOUGHSwitch PoE [28/43] Spanning tree settings for port

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.

Ubiquiti TOUGHSwitch PoE [28/43] Spanning tree settings for port

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