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64 ZT8101 User’s Guide
Using the Telnet Console
Advanced Setup
Most of the following options can be configured independently of the other options. However, you
must configure a VLAN before you can configure an IP interface for it.
Spanning Tree
The Spanning Tree Protocol (STP) prevents loops in a network by allowing only one active path
between any two network devices at a time. (For more information about using this protocol, refer
to “Spanning Tree Concepts” in chapter 3.)
STP operates on two levels. On the switch level, the settings are globally implemented. On the port
level, the settings are implemented on a user-defined group basis. STP must be enabled on the
switch for it to be enabled on a particular port.
To configure global STP switch settings
1. From the Main Menu, select Spanning Tree and press Enter.
2. Using the spacebar, toggle the Status field to Enabled or Disabled.
The factory default settings should cover the majority of installations, and most installations
should keep these default settings.
3. To change the factory default settings, configure these fields.
Field Default Description
Max Age 20
Specifies the maximum time (in seconds) the switch will wait
for a configuration message from the root bridge. At the end
of this time, the switch will start sending out its own
configuration messages for permission to become the root
bridge.
The device with the lowest bridge identifier becomes the
root bridge (see the Priority field).
Max Age must be set within the following range:
• The minimum value is the higher of 6 or [2 x (Hello Time
+1)]
• The maximum value is the lower of 40 or [2 x (Forward
Delay -1)]
Hello Time 2
Specifies the time interval (in seconds) between two
configuration messages. The root bridge sends these
messages at this interval to inform all other devices that it is
the root bridge. This time will be used if and when your
switch becomes the root bridge.
It can be set from 1—10 seconds.
The Hello Time cannot be longer than the Max Age.
Otherwise, a configuration error occurs.