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PowerConnect B-Series FCX Configuration Guide 225
53-1002266-01
Configuring STP related features
8
To exclude a set of ports from Fast Port Span, enter commands such as the following.
PowerConnect(config)#fast port-span exclude ethernet 1 ethernet 2 ethernet 3
PowerConnect(config)#write memory
To exclude a contiguous (unbroken) range of ports from Fast Span, enter commands such as the
following.
PowerConnect(config)#fast port-span exclude ethernet 1 to 24
PowerConnect(config)#write memory
Syntax: [no] fast port-span [exclude ethernet <port> [ethernet <port>] | to [<port>]]
Specify the <port> variable in the following formats:
• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
To re-enable Fast Port Span on a port, enter a command such as the following.
PowerConnect(config)#no fast port-span exclude ethernet 1
PowerConnect(config)#write memory
This command re-enables Fast Port Span on port 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.
PowerConnect(config)#no fast port-span
PowerConnect(config)#fast port-span
PowerConnect(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.
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 a Dell PowerConnect 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 a Dell
PowerConnect device but the device at the other end of the link can be a Dell PowerConnect device
or another vendor’s switch.
Configuration of the Fast Uplink Span feature takes place entirely on the Dell PowerConnect device.
To configure the Fast Uplink Span feature, specify a group of ports that have redundant uplinks on
the wiring closet switch. If the active link becomes unavailable, the Fast Uplink Span feature
transitions the forwarding to one of the other redundant uplink ports in four seconds. All Fast
Uplink Span-enabled ports are members of a single Fast Uplink Span group.