Configuring 40 Gbps breakout ports
Use the breakout ethernet command to divide available ICX 7750 40 Gbps ports into four 10 Gbps
sub-ports when a breakout cable is attached.
By default, all main 40 Gbps ports are configured to come up in 40 Gbps mode. Once ports are cabled
for breakout, configure the ports using the breakout ethernet command at the global configuration
level.
NOTE
You should remove any interface-level configuration before configuring breakout.
NOTE
If the device is in cut-through mode and you attempt to configure breakout, an error is returned. Cut-
through must be disabled to return the unit to store-and-forward mode before breakout is configured.
The breakout ethernet command first checks for existing configuration on the port. If existing
configuration is detected, an error message similar to the following is displayed to indicate that prior
configuration must be removed.
Device# configure terminal
Device(config)# breakout ethernet 1/1/11
Error: Port 1/1/11 is tagged
Once any previous configuration is removed, the breakout ethernet command must be reissued. The
resulting configuration must be saved, and the unit must then be reloaded before the four 10 Gbps
sub-ports are created and accessible.
For example, to configure ports 1/3/1 through 1/3/6 for breakout, issue the
following commands:
Device# configure terminal
Device(config)# breakout ethernet 1/3/1 to ethernet 1/3/6
The following example configures breakout on port 1/1/5. On the first
configuration attempt, an error is returned. The interface-level configuration is
removed. Then the write-memory command is issued, followed by the reload
command, to successfully configure the port for breakout.
Device# configure terminal
Device(config)# breakout ethernet 1/1/5
Error: Port 1/1/5 has sflow forwarding
Device(config)# interface ethernet 1/1/5
Device(config-if-e40000-1/1/5)# no sflow forwarding
Device(config-if-e40000-1/1/5)# end
Device# write memory
Write startup-config done.
Device# configure terminal
Device(config)# breakout ethernet 1/1/5
Reload required. Please write memory and then reload or power cycle.
Device(config)# write memory
Write startup-config done.
Device(config)# Flash Memory Write (8192 bytes per dot) .
Copy Done.
Device(config)# end
Device# reload
Configuring 40 Gbps breakout ports
378 FastIron Ethernet Switch Administration Guide
53-1003625-01
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