Planet GS-5220 Series User Manual page 228

The following are the user-configurable STP parameters for the switch level:
Parameter
Bridge Identifier(Not user
configurable
except by setting priority
below)
Priority
Hello Time
Maximum Age Timer
Forward Delay Timer
The following are the user-configurable STP parameters for the port or port group level:
Variable
Description
A combination of the User-set priority
and the switch's MAC address.
The Bridge Identifier consists of two
parts:
a 16-bit priority and a 48-bit Ethernet
MAC address 32768 + MAC
A relative priority for each switch –
lower numbers give a higher priority
and a greater chance of a given switch
being elected as the root bridge
The length of time between broadcasts
of the hello message by the switch
Measures the age of a received BPDU
for a port and ensures that the BPDU is
discarded when its age exceeds the
value of the maximum age timer.
The amount time spent by a port in the
learning and listening states waiting for
a
BPDU that may return the port to the
blocking state.
Description
User's Manual of GS-5220 LCD Series
Default Value
228
Default Value
32768 + MAC
32768
2 seconds
20 seconds
15 seconds