D-Link DES-3624 - Switch - Stackable User manual - page 59
Stackable NWay Ethernet Switch User’s Guide
♦ 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.
Switch Management Concepts
39