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D-Link DHS-3224V Switch User’s Guide
26
Switch Level STP
The switch STP parameters listed here can be configured by the user:
Parameter Description Default Value
Bridge Identifier
(Not user-
configurable except
by setting priority
below)
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
Priority
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
32768
Hello Time
The length of time between broadcasts of the hello
message by the switch
2 seconds
Maximum Age
Timer
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.
20 seconds
Forward Delay
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.
15 seconds
Port Level STP
The VLAN or port STP parameters listed here may be configured by the user:
Variable Description Default Value
Port Priority
A relative priority for each port – lower numbers
give a higher priority and a greater chance of a
given port being elected as the root port
32768
Port Cost
A value used by STP to evaluate paths – STP
calculates path costs and selects the path with the
minimum cost as the active path.
10 – 100Mbps Fast
Ethernet ports
Bridge Protocol Data Units
The Switch uses the following information for STP to stabilize network topology:
- The unique switch identifier
- The path cost to the root associated with each switch port
- The port identifier
This STP information is shared among switches on the network using Bridge Protocol Data Units (BPDUs).
Each BPDU contains the following information:
- The unique identifier of the switch that the transmitting switch currently believes is the root switch
- The path cost to the root from the transmitting port
- The port identifier of the transmitting port