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

Configuring the GbE Interconnect Switch using the Command Line Interface
• Port—Sets the STP priority and port cost parameters for one port or a series of ports
— Priority—This parameter sets the relative priority for the port. A lower number
indicates a higher priority and a greater chance of the port being elected as the root
port.
— Port cost—Port cost is a value used by STP to evaluate paths. STP calculates port
costs and selects the path with the minimum cost as the active path.
IMPORTANT: Observe the following formulas when setting the STP parameters on the root switch:
• Max Age ≤ 2 x (Forward Delay - 1 second)
• Max Age ≥ 2 x (Hello Time + 1 second)
The following shows the factory default STP settings:
Feature Default Value
Bridge Max Age 20 seconds
Bridge Hello Time 2 seconds
Bridge Forward Delay 15 seconds
Bridge Priority 32768
Port Priority 128
Port Cost 19 for ports 1-20 and 23-24
4 for ports 21-22
IMPORTANT: The factory default settings should be adequate for the majority of installations. HP
recommends that you keep the default settings as set at the factory unless it is absolutely necessary to
change them.
HP ProLiant BL p-Class GbE Interconnect Switch Command Line Interface Reference Guide 2-55