Interlogix GE-DS-242-PoE User Manual page 81

On the switch level, STP calculates the Bridge Identifier for each switch
NOTE:
and then sets the Root Bridge and the Designated Bridges.
On the port level, STP sets the Root Port and the Designated Ports.
The following are the user-configurable STP parameters for the switch:
DESCRIPTION
PARAMETER
A combination of the User-set priority and the
Bridge Identifier
switch's MAC address.
(Not user
The Bridge Identifier consists of two parts:
configurable
except by setting
a 16-bit priority and a 48-bit Ethernet MAC address
priority below)
32768 + MAC.
A relative priority for each switch - lower numbers
give a higher priority and a greater chance of a
Priority
given switch being elected as the root bridge.
The length of time between broadcasts of the hello
Hello Time
message by the switch.
Measures the age of a received BPDU for a port
Maximum Age
and ensures that the BPDU is discarded when its
Timer
age exceeds the value of the maximum age timer.
The amount time spent by a port in the learning
Forward Delay
and listening states waiting for a BPDU that may
Timer
return the port to the blocking state.
The following are the user-configurable STP parameters for the port or port group
level:
PARAMETER DESCRIPTION
A relative priority for each switch - lower numbers
give a higher priority and a greater chance of a
Port Priority
given switch being elected as the root bridge.
A value used by STP to evaluate paths - STP
calculates path costs and selects the path with the
Port Cost
minimum cost as the active path.
GE-DS-242-PoE Managed Ethernet Switch User Manual
Chapter 4: Console Management
DEFAULT
VALUE
32768 + MAC
32768
2 seconds
20 seconds
15 seconds
DEFAULT VALUE
128
200,000-100Mbps
Fast Ethernet ports
20,000-1000Mbps
Gigabit Ethernet
ports
0 - Auto
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