User`s guide

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Figure 2-18
2.3 Redundancy
2.3.1 Spanning Tree
1. Spanning Tree Protocol
The IEEE 802.1D Spanning Tree Protocol allows for the blocking of links between
switches that form loops within the network. When multiple links between switches are
detected, a primary link is established. Duplicated links are blocked from use and
become standby links. The protocol allows for the duplicate links to be used in the
event of a failure of the primary link. Once the Spanning Tree Protocol is configured
and enabled, primary links are established and duplicated links are blocked
automatically. The reactivation of the blocked links (at the time of a primary link failure)
is also accomplished automatically without operator intervention.
This automatic network reconfiguration provides maximum uptime to network users.
However, the concepts of the Spanning Tree Algorithm and protocol are a complicated
and complex subject and must be fully researched and understood. It is possible to
cause serious degradation of the performance of the network if the Spanning Tree is
incorrectly configured. Please read the following before making any changes from the
default values.
The Switch STP performs the following functions: