Technical data

Brocade MLX Series and NetIron Family Documentation Updates 51
53-1002805-03
STP feature configuration
1
Brocade(config)#write memory
To exclude a set of ports from Fast Port Span, enter commands such as the following.
Brocade(config)#fast port-span exclude ethernet 1 ethernet 2 ethernet 3
Brocade(config)#write memory
To exclude a contiguous (unbroken) range of ports from Fast Span, enter commands such as the
following.
Brocade(config)#fast port-span exclude ethernet 1 to 24
Brocade(config)#write memory
Syntax: [no] fast port-span [exclude ethernet <port> [ethernet <port>] | to [<port>]]
Specify the port variable in one of the following formats:
• FWS, FCX, and ICX stackable switches – stack-unit/slotnum/portnum
• FSX 800 and FSX 1600 chassis devices – slotnum/portnum
• ICX devices – slotnum/portnum
• FESX compact switches – portnum
To re-enable Fast Port Span on a port, enter a command such as the following.
Brocade(config)#no fast port-span exclude ethernet 1
Brocade(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.
Brocade(config)#no fast port-span
Brocade(config)#fast port-span
Brocade(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 Span 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).