Parameters Description - HP 445860-B21 - 10Gb Ethernet BL-c Switch Command Reference Manual

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.
STP parameters
Table 22
Parameters
Current Root
Path-Cost
Port
Priority (bridge)
Hello
MaxAge
FwdDel
Aging
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 MaxAge value of the root
bridge.
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 value of the root bridge.
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.
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