C122-B001-02EN
5-13
5.2 Main GSWB Functions
5.2.3
Spanning tree function
This function determines the dynamic relay path of a bridge relay as stipulated in
IEEE802.1D.
This function is used when a bridge network that has multiple paths between two
points is created.
The spanning tree protocol automatically constructs tree-formed logical paths
(spanning tree) including all switches based on message exchanges between switches.
If a physical loop exists, loop configuration can be avoided because ports that do not
form a tree are automatically blocked. A redundancy function, which re-computes the
tree and switches to a new path automatically whenever one part of a path is blocked
due to a failure, is also provided.
shows the difference in the system depending on whether this function is
enabled or disabled.
Figure 5.3 Spanning tree function
SW
SW
SW
SW
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When the spanning tree function is disabled
When the spanning tree function is enabled
This path can be used as
a backup path at a failure.
A frame transits
within a loop.
Data can be received and
sent by the shortest path.
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GSWB
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When the spanning tree function is disabled
When the spanning tree function is enabled
This path can be used as
a backup path at a failure.
A frame transits
within a loop.
Data can be received and
sent by the shortest path.
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