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24-Port 10/100/1000 Gigabit Switch with Webview and PoE
Last Topology Change. Indicates the amount of time that has elapsed since the bridge was initialized or reset,
and the last topographic change occurred. The time is displayed in a day hour minute second format, for
example, 2 days 5 hours 10 minutes and 4 seconds.
Spanning Tree Tab - STP Settings
Configure the global settings for STP using this screen. Global settings apply to the entire Switch.
Spanning Tree State. Indicates if STP is enabled on the device.
Spanning Tree Type. Specifies the type of spanning tree used on the Switch:
• STP: Spanning Tree Protocol (IEEE 802.1D); i.e., when this option is selected, the Switch will use RSTP set
to STP forced compatibility mode).
• RSTP: Rapid Spanning Tree Protocol (IEEE 802.1w); RSTP is the default.
Priority. Specifies the bridge priority value. When switches or bridges are running STP, each is assigned a
priority. After exchanging BPDUs, the device with the lowest priority value becomes the Root Bridge. The default
value is 32768. The port priority value is provided in increments of 4096. For example, 4096, 8192, 12288, etc.
The range is 0 to 65535.
Hello Time. Specifies the device Hello Time. The Hello Time indicates the amount of time in seconds a root bridge
waits between configuration messages. The default is 2 seconds. The range is 1 to 10 seconds.
Maximum 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 STP 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.) The default max age is 20 seconds. The range is 6 to 40 seconds.
Forward Delay. The maximum time (in seconds) this 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. The default is 15
seconds. The range is 4 to 30 seconds.
Path Cost Method. The path cost is used to determine the best path between devices. The path cost method is
used to determine the range of values that can be assigned to each interface
Chapter 5: Using the Web-based Utility for Configuration
Spanning Tree Tab - STP Settings
Figure 5-44: Spanning Tree - STP Settings
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