HP ProLiant BL p-Class GbE2 Command Reference Manual page 48

The following table describes the STP parameters.
Table 4-5: STP Parameters
Parameter
Path-Cost
Port
Priority (bridge)
Hello
MaxAge
FwdDel
Aging
Priority (port)
Cost
State
Designated bridge
Designated port
HP ProLiant BL p-Class GbE2 Interconnect Switch Command Reference Guide
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Description
The port path cost is used to help determine the designated port
for a segment. Generally speaking, the faster the port, the lower
the path cost.
The current root port refers to the port on the GbE2 Interconnect
Switch that receives data from the current root. Zero (0) indicates
the root bridge of the STP.
The bridge priority parameter controls which bridge on the
network will become the STP root bridge.
The hello time parameter specifies, in seconds, how often the
root bridge transmits a configuration bridge protocol data unit
(BPDU). Any bridge that is not the root bridge uses the root
bridge hello value.
The maximum age parameter specifies, in seconds, the maximum
time the bridge waits without receiving a configuration bridge
protocol data unit before it reconfigures the STP network.
The forward delay parameter specifies, in seconds, the amount of
time that a bridge port has to wait before it changes from learning
state to forwarding state.
The aging time parameter specifies, in seconds, the amount of
time the bridge waits without receiving a packet from a station
before removing the station from the Forwarding Database.
The port priority parameter helps determine which bridge port
becomes the designated port. In a network topology that has
multiple bridge ports connected to a single segment, the port with
the lowest port priority becomes the designated port for the
segment.
The port path cost parameter is used to help determine the
designated port for a segment. Generally speaking, the faster the
port, the lower the path cost. A setting of zero (0) indicates that
the cost will be set to the appropriate default after the link speed
has been auto-negotiated.
The State field shows the current state of the port. The State field
can be BLOCKING, LISTENING, LEARNING, FORWARDING, or
DISABLED.
The designated bridge is the Layer 2 device in a local area
network (LAN) segment that is elected to perform the forwarding
actions.
Each designated port has a reference number that consists of the
physical port number plus the bridge priority.
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