ProLiant BL p-Class GbE Interconnect Switch Command Line Interface Reference Guide

Configuring the GbE Interconnect Switch using the Command Line Interface
STP communicates between switches on the network using Bridge Protocol Data Units
(BPDUs). Each BPDU contains the following information:
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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
The switch sends BPDUs to communicate and construct the spanning-tree topology. All
switches connected to the LAN on which the packet is transmitted will receive the BPDU.
BPDUs are not directly forwarded by the switch, but the receiving switch uses the
information in the frame to calculate a BPDU, and if the topology changes, initiates a BPDU
transmission.
The communication between switches via BPDUs results in the following:
One switch is elected as the root switch.
The shortest distance to the root switch is calculated for the switch.
A designated switch is selected. This is the switch closest to the root switch through
which packets will be forwarded to the root.
A port for each switch is selected. This is the port providing the best path from the switch
to the root switch.
Ports included in the STP are selected.
NOTE: Refer to Appendix E in the HP ProLiant BL p-Class GbE Interconnect Switch User Guide for
more information on Spanning Tree Protocol.
The following shows the STP factory default setting:
Feature Default Value
Switch STP Enabled
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