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24-Port 10/100/1000 Gigabit Switch with Webview and PoE
Spanning Tree Tab
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.Loops occur when alternate routes exist between hosts. Loops in an extended network can cause bridges
to forward traffic indefinitely, resulting in increased traffic and reducing network efficiency.
Spanning Tree Tab - Global Settings
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. Indicates if STA is enabled on the device.
Spanning Tree Mode. Indicates the STA mode by which STP is enabled on the device.
Bridge ID. Identifies the Bridge priority and MAC address.
Figure 5-43: Spanning Tree - Global Settings
Designated Root. Indicates the ID of the bridge with the lowest path cost to the instance ID.
Root Port. Indicates the port number that offers the lowest cost path from this bridge to the Root Bridge. It is
significant when the Bridge is not the Root. The default is zero.
Root Path Cost. The cost of the path from this bridge to the root.
Root Maximum Age. Indicates the device Maximum Age Time. The Maximum Age Time indicates the amount of
time in seconds a bridge waits before sending configuration messages. The default max age is 20 seconds. The
range is 6 to 40 seconds.
Root Hello Time. Indicates 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.
Root Forward delay. Indicates the device forward delay time. The Forward Delay Time indicates the amount of
time in seconds a bridge remains in a listening and learning state before forwarding packets. The default is 15
seconds. The range is 4 to 30 seconds.
Topology Changes Counts. Indicates the total amount of STP state changes that have occurred.
Chapter 5: Using the Web-based Utility for Configuration
61
Spanning Tree Tab
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