HP GbE2c - Blc Layer 2/3 Fiber SFP Option Command Reference Manual page 38

The switch software uses the IEEE 802.1d Spanning Tree Protocol (STP). If RSTP/MSTP is turned on, see the "Rapid
Spanning Tree information" section for Spanning Tree Group information. In addition to seeing if STP is enabled or
disabled, you can view the following STP bridge information:
Status of Uplink Fast (upfast)
Current root MAC address
Path-Cost
Port
Hello interval
Maximum age value
Forwarding delay
Aging time
You can also refer to the following port-specific STP information:
Port number and priority
Cost
State
Port Fast Forwarding state
Designated bridge
Designated port
The following table describes the STP parameters.
Table 22 STP parameters
Parameter
Current Root
Path-Cost
Port
Priority (bridge)
Hello
MaxAge
FwdDel
Aging
Priority (port)
Cost
State
Designated bridge
Description
Shows information about the root bridge for the Spanning Tree. Information includes the
priority (hex) and MAC address of the root.
Path-cost is the total path cost to the root bridge. It is the summation of the path cost
between bridges (up to the root bridge).
The current root port refers to the port on the 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. If the bridge is not the root bridge, it uses the
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. If the bridge is not
the root bridge, it uses the
FwdDel
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.
The State field shows the current state of the port. The State field can be one of the
following: BLOCKING, LISTENING, LEARNING, FORWARDING, or DISABLED.
Shows information about the bridge connected to each port, if applicable. Information
includes the priority (hex) and MAC address of the Designated Bridge.
value of the root bridge.
MaxAge
value of the root bridge.
Information Menu 38