Configuring Spanning Tree Protocol (STP)

4.Select the Save link at the bottom of the panel. Select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.

Excluding Specific Ports from Fast Port Span

You can exclude individual ports from Fast Port Span while leaving Fast Port Span enabled globally. To do so, use one of the following methods.

USING THE CLI

To exclude a port from Fast Port Span, enter commands such as the following:

HP9300(config)# fast port-span exclude ethernet 1/1

HP9300(config)# write memory

To exclude a set of ports from Fast Port Span, enter commands such as the following:

HP9300(config)# fast port-span exclude ethernet 1/1 ethernet 2/1 ethernet 3/2 HP9300(config)# write memory

To exclude a contiguous (unbroken) range of ports from Fast Span, enter commands such as the following:

HP9300(config)# fast port-span exclude ethernet 1/1 to 1/24

HP9300(config)# write memory

Syntax: [no] fast port-span [exclude ethernet <portnum> [ethernet <portnum>… to <portnum>]]

To re-enable Fast Port Span on a port, enter a command such as the following:

HP9300(config)# no fast port-span exclude ethernet 1/1

HP9300(config)# write memory

This command re-enables Fast Port Span on port 1/1 only and does not re-enable Fast Port Span on other excluded ports. You also can re-enable Fast Port Span on a list or range of ports using the syntax shown above this example.

To re-enable Fast Port Span on all excluded ports, disable and then re-enable Fast Port Span by entering the following commands:

HP9300(config)# no fast port-span

HP9300(config)# fast port-span

HP9300(config)# write memory

Disabling and then re-enabling Fast Port Span clears the exclude settings and thus enables Fast Port Span on all eligible ports. To make sure Fast Port Span remains enabled on the ports following a system reset, save the configuration changes to the startup-config file after you re-enable Fast Port Span. Otherwise, when the system resets, those ports will again be excluded from Fast Port Span.

USING THE WEB MANAGEMENT INTERFACE

You cannot exclude individual ports from Fast Span using the Web management interface.

Fast Uplink Span

The Fast Port Span feature described in the previous section enhances STP performance for end stations. The Fast Uplink feature enhances STP performance for wiring closet switches with redundant uplinks. Using the default value for the standard STP forward delay, convergence following a transition from an active link to a redundant link can take 30 seconds (15 seconds for listening and an additional 15 seconds for learning).

You can use the Fast Uplink feature on an HP device deployed as a wiring closet switch to decrease the convergence time for the uplink ports to another device to just four seconds (two seconds for listening and two seconds for learning). The wiring closet switch must be an HP device but the device at the other end of the link can be an HP device or another vendor’s switch. Configuration of the Fast Uplink Span feature takes place entirely on the HP device.

To configure the Fast Uplink Span feature, specify a group of ports that have redundant uplinks on the wiring closet switch (HP device) as members of a Fast Uplink Group. If the active link becomes unavailable, the Fast Uplink Span feature transitions the forwarding to one of the other ports in four seconds. You can configure one

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