HP 445860-B21 - 10Gb Ethernet BL-c Switch Command Reference Manual page 47

The switch software can be set to use the IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) or the IEEE
802.1s Multiple Spanning Tree Protocol (MSTP). If RSTP/MSTP is turned on, you can view the following
RSTP bridge information for the Spanning Tree Group:
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 RSTP information:
Port number and priority
Cost
State
Role
Designated bridge and port
Link type
The following table describes the STP parameters in RSTP or MSTP mode.
Rapid Spanning Tree parameter descriptions
Table 23
Parameter
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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