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— Priority—A priority for the switch module can be set from 0 to 65,535. Zero
IMPORTANT: Observe the following formulas when setting the STP parameters for the root
switch:
•
•
3. After making your changes, highlight APPLY, then press the Enter key.
IMPORTANT: To save the configuration settings permanently, you must enter them into NVRAM
using the Save Changes option on the main menu. Refer to the "Saving Changes" section earlier
in this chapter.
The screen also displays STP status information, including:
— Bridge ID—The ID of the bridge (switch) used only for spanning tree functions. The
— Designated Root Bridge—The current elected root bridge. The root bridge has a
— Root Priority—The priority of the current designated root bridge
— Cost to Root—The summation of all path costs between the current bridge and the
— Root Port—The port on the current bridge that has the best path to reach the
— Last Topology Change—The number of seconds since the last change in topology
— Topology Changes Count—The number of times there has been a change in
Setting Spanning Tree Parameters at the Port Level
Once STP is enabled on the switch, you can configure ports to participate in the spanning tree
domain, by enabling or disabling the STP function on a per port basis. Ports can also be
configured in STP bypass mode (fast forward mode) that allows the port to skip the initial
STP states (listening and learning) before enabling it in the forwarding state.
HP ProLiant BL e-Class C-GbE Interconnect Switch Menu-driven Interface Reference Guide
HP CONFIDENTIAL Codename: DeLorean Part Number: 322858-001 Last Saved On: 2/4/03 11:56 AM
indicates the highest priority. The priority number is used in the voting process
between switches on the network to determine which switch will be the root switch.
A low number indicates a high priority, and a higher probability that this switch
module will be elected as the root switch.
Max Age ≤ 2 x (Forward Delay - 1 second)
Max Age ≥ 2 x (Hello Time + 1 second)
ID is made up of the bridge priority and bridge MAC address.
bridge ID lower than the other bridges.
root bridge via the root port
designated root bridge.
occurred that caused the spanning tree algorithm to be recalculated
topology since the last reboot of the current bridge
Configuring the Switch Modules using the Menu-driven Interface
2-21
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