Configuration Guide User guide

FastIron Configuration Guide 261
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FCX IronStack configuration
Configuring default ports on FCX devices
On FCX devices, the default-port command is used to define stacking port candidates. A stacking
port is always a default port, but a default port may not necessarily be a stacking port. Default
ports can become stacking ports using the secure-setup utility, or through automatic stack
building.
Secure-setup probe packets can be received by a default port whether or not it is acting as a
stacking port. Stacking packets can be only received by a stacking port (which is also always a
default port). In order to use stacking ports that are not defined in the default configuration, you
must define the port settings for each unit using the default-port command, so that secure-setup
can discover the topology of the stack.
The 4-byte Ethernet preamble for the Ethernet frame is used when a port is configured as a default
stacking port. For non-default ports, the standard 8-byte Ethernet preamble is used. For a default
port that is used as a regular data port, the standard 8-byte Ethernet preamble must be explicitly
enabled on the port using the long-preamble command. For details, refer to “Configuring a default
stacking port to function as a data port” on page 264.
Stackable devices ship with two default stacking ports configured. Use the stack-port command to
select only one of these factory default ports as the stacking port. If you do not configure
stack-port, both default ports will operate as stacking ports.
Use the default-port command to use ports other than the factory default ports as stacking ports.
You must configure default-port on each unit before building a stack. Once you have configured
default-port on all units, you can then use any of the three stack construction methods to build a
stack. The Active Controller then learns the port configuration for each unit.
NOTE
You cannot change the setting for a default port if the port is in use.
Changing default stacking port configurations
For FCX-E and FCX-I devices, ports 1 and 2 of the optional 10 Gbps SFP+ module (slot 2) act as the
default stacking ports. You can change the default stacking ports to 3 and 4 on this module, or
disable stacking, on all of the module ports. The following example changes the default ports on a
10 Gbps module from 1 and 2 to 3 and 4.
Brocade 10g-1(config)# stack unit 1
10g-1(config-unit-1)#
10g-1(config-unit-1)# default-ports 1/2/3 1/2/4
Table 40 identifies the slot and port designations for each model.
NOTE
FCX-I and FCX-E models cannot be used in an IronStack without the addition of an optional 10 Gbps
SFP+ module.