Stackable NWay Ethernet Switch User’s Guide
Switch Management Concepts
35
Spanning Tree Algorithm
The Spanning Tree Algorithm (STA) in the Switch allows you to
create alternative paths (with multiple switches or other types of
bridges) in your network. These backup paths are idle until the
Switch determines that a problem has developed in the primary
paths. When a primary path is lost, the switch providing the
alternative path will automatically go into service with no operator
intervention. This automatic network reconfiguration provides
maximum uptime to network users. The concept of the Spanning
Tree Algorithm is a complicated and complex subject and must be
fully researched and understood. Please read the following before
making any changes.
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Network loop detection and prevention
With STA, there
will be only one path between any two LANs. If there is more
than one path, forwarded packets will loop indefinitely. STA
detects any looped path and selects the path with the lowest
path cost as the active path, while blocking the other path and
using it as the backup path.
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Automatic topology re-configuration
When the path for
which there is a backup path fails, the backup path will be
automatically activated, and STA will automatically re-
configure the network topology.
STA Operation Levels
STA operates on two levels: the bridge level and the port level. On the
bridge level, STA calculates the Bridge Identifier for each Switch,
then sets the Root Bridge and the Designated Bridges. On the port
level, STA sets the Root Port and Designated Ports. Details are as
follows:
Содержание TEG-S224 Series
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