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24-port NWay Ethernet Switch User’s Guide
Switch Management Concepts
35
♦
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
: The Hello Time cannot be longer than the Max.
Age. Otherwise, a configuration error will
occur.
♦
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.
♦
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)
♦
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.