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Page 76 / 104 Scroll up to view Page 71 - 75
68
Chapter 5: Configuring the Switch through the Web Utility
PoE
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
PoE
This switch can provide DC power to a wide range of connected devices, eliminating the need for an additional
power source and cutting down on the amount of cables attached to each device. Once configured to supply
power, an automatic detection process is initialized by the switch that is authenticated by a PoE signature from
the connected device. Detection and authentication prevent damage to non-802.3af compliant devices.
The PoE tab includes links to the following screens.
•
Power Config
•
Power Port Config
•
Power Port Status
•
Power Status
Power Config
A maximum PoE power budget for the switch (power available to all switch ports) can be defined so that power
can be centrally managed, preventing overload conditions at the power source. If the power demand from
devices connected to the switch exceeds the power budget setting, the switch uses port power priority settings
to limit the supplied power.
Specify the desired power budget for the switch.
Click
Submit
to save the changes.
Figure 5-55: PoE - Power Config
Page 77 / 104
69
Chapter 5: Configuring the Switch through the Web Utility
PoE
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Power Port Config
If a device is connected to a switch port and the switch detects that it requires more than the power budget of
the port, no power is supplied to the device (that is, port power remains off).
If the power demand from devices connected to switch ports exceeds the power budget set for the switch, the
port power priority settings are used to control the supplied power.
Mark the Enabled checkbox to enable PoE power on selected ports, set the priority using the drop-down menu
provided and set the power allocation for each port.
Click
Submit
to save the changes.
Power Port Status
Use Power Port Status to display the current PoE power status for all ports.
Figure 5-56: PoE - Power Port Config
Figure 5-57: PoE - Power Port Status
Page 78 / 104
70
Chapter 5: Configuring the Switch through the Web Utility
PoE
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Power Status
This screen displays the following information.
Maximum Available Power
System Operation Status
Mainpower Consumption
Software Version
Figure 5-58: PoE - Power Status
Page 79 / 104
71
Chapter 5: Configuring the Switch through the Web Utility
Spanning Tree
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Spanning Tree
The Spanning Tree Algorithm (STA) can be used to detect and disable network loops, and to provide backup links
between switches, bridges or routers. This allows the switch to interact with other bridging devices (that is, an
STA-compliant switch, bridge or router) in your network to ensure that only one route exists between any two
stations on the network, and provide backup links which automatically take over when a primary link goes down
The Spanning Tree tab includes links to the following screens.
•
Information
•
Configuration
•
Port Info
•
LAG Info
•
Port Conf
•
LAG Conf
Page 80 / 104
72
Chapter 5: Configuring the Switch through the Web Utility
Spanning Tree
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Information
You can display a summary of the current bridge STA information that applies to the entire switch using the
Information screen.
This screen displays the following information.
Spanning Tree State
. Shows if the switch is enabled to participate in an STA-compliant network.
Designated Root
. The priority and MAC address of the device in the Spanning Tree that this switch has accepted
as the root device.
Bridge ID
. A unique identifier for this bridge, consisting of the bridge priority and MAC address (where the
address is taken from the switch system).
Root Port
. The number of the port on this switch that is closest to the root. This switch communicates with the
root device through this port. If there is no root port, then this switch has been accepted as the root device of the
Spanning Tree network.
Max Age
. The maximum time (in seconds) a device can wait without receiving a configuration message before
attempting to reconfigure. All device ports (except for designated ports) should receive configuration messages at
regular intervals. Any port that ages out STA information (provided in the last configuration message) becomes
the designated port for the attached LAN. If it is a root port, a new root port is selected from among the device
ports attached to the network. (References to “ports” in this section mean “interfaces,” which includes both
ports and lags.)
Root Path Cost
. The path cost from the root port on this switch to the root device.
Hello Time
. Interval (in seconds) at which this device transmits a configuration message.
Configuration Changes
. The number of times the Spanning Tree has been reconfigured.
Forward Delay
. The maximum time (in seconds) the root device will wait before changing states (i.e., discarding
to learning to forwarding). This delay is required because every device must receive information about topology
changes before it starts to forward frames. In addition, each port needs time to listen for conflicting information
that would make it return to a discarding state; otherwise, temporary data loops might result.
Last Topology Change
. Time since the Spanning Tree was last reconfigured.
Figure 5-59: Spanning Tree - Information

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