Dell PowerConnect B-FCXs Configuration Manual page 154

5
Building an IronStack
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 longpreamble command. For details, refer to
stacking port to function as a data port"
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 PowerConnect B-Series FCX-E and PowerConnect B-Series 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.
PowerConnect 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 22
NOTE
PowerConnect B-Series FCX-I and PowerConnect B-Series FCX-E models cannot be used in an
IronStack without the addition of an optional 10 Gbps SFP+ module.
NOTE
The two left ports on the Four-port 10 Gpbs SFP+ module do not pass regular Ethernet traffic by
default. If stacking is not required the stack disable comand must be entered at the global level and
the stack disable CLI command must be configured on these two ports in order for them to pass
regular traffic.
NOTE
If stacking is needed but not all default stacking ports are needed. Specify the stack ports per unit.
For non-stacking ports to be used as regular data port, the long-preamble command should be used
on the non-stacking port interface.
112
identifies the slot and port designations for each model.
on page 115.
PowerConnect B-Series FCX Configuration Guide
"Configuring a default
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