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10/100 Fast Ethernet Switch User’s Guide
28
Switch Management
♦
Bridge Priority
. A Bridge Priority can be from 0 to 65535. 0 is
equal to the highest Bridge Priority.
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Bridge Hello Time
. The Hello Time can be from 1 to 10 seconds.
This is the interval between two 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 that the Hello Time cannot be longer than the Max. Age.
Otherwise, a configuration error will occur.
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Bridge Max. Age
. The Max. Age can be 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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Bridge Forward Delay
. The Forward Delay can be from 4 to 30
seconds. This is the time any port on the Switch spends in the
listening state while moving from the blocking state to the
forwarding state.
Observe the following formulas when you set the above parameters:
1. Max. Age
•
2 x (Forward Delay - 1 second)
2. Max. Age
•
2 x (Hello Time + 1 second)
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Port Priority
: A Port Priority can be from 0 to 255. The lower the
number, the greater the probability the port will be chosen as the
Root Port.