D-Link DES-3326 User Manual page 216

DES-3326 Layer 3 Fast Ethernet Switch User's Guide
Figure 6-65. Configure Spanning Tree - Global
The Spanning Tree Protocol (STP) operates on two levels: on the
switch level, the settings are globally implemented. On the port
level, the settings are implemented on a per user-defined Group
basis.
Note: The factory default setting should cover the majority
of installations. However, it is advisable to keep the default
settings as set at the factory; unless, it is absolutely
necessary.
The user-changeable parameters in the Switch are as follows:
Max. Age: [ ] The Max. Age can be set from 6 to 40
seconds. At the end of the Max. Age, if a BPDU has still
not been received from the Root Bridge, your Switch will
start sending its own BPDU to all other Switches for
permission to become the Root Bridge. If it turns out
that your Switch has the lowest Bridge Identifier, it will
become the Root Bridge.
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Configuring the Switch Using the Console Interface