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Note:
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: [
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.
Hello Time:[
transmissions of BPDU packets sent by the Root Bridge to tell all other Switches that it is indeed the Root
Bridge. If you set a Hello Time for your Switch, and it is not the Root Bridge, the set Hello Time will be used if
and when your Switch becomes the Root Bridge.
Note: The Hello Time cannot be longer than the Max. Age. Otherwise, a configuration error will occur.
Forward Delay:[
Switch spends in the listening state while moving from the blocking state to the forwarding state.
Priority:[
number is used in the voting process between switches on the network to determine which switch will be the
root switch. A low number indicates a high priority, and a high probability that this switch will be elected as
the root switch.
Note: Observe the following formulas when setting the above parameters:
Max. Age
Figure 6-62. Configure Spanning Tree screen
] – The Maximum Age can be set from 6 to 40 seconds. At the end of the Max. Age, if a BPDU
] – The Hello Time can be set from 1 to 10 seconds. This is the interval between two
] – The Forward Delay can be from 4 to 30 seconds. This is the time any port on the
] – A Priority for the switch can be set from 0 to 65535. 0 is equal to the highest Priority. This
2 x (Forward Delay - 1 second)
8-port Gigabit Ethernet Switch User's Guide
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Troubleshooting
