Reference Guide
**Oversubscription: Congure oversubscription to support bursty storage trac on a Fibre Channel interface. Oversubscription allows a
port to operate faster, but may result in trac loss. To support oversubscription, use the speed command in Interface Conguration mode.
This command is not supported on an Ethernet interface. In S4148U-ON port proles:
• SFP+ and QSFP28 port groups in 4x8GFC mode support 16GFC oversubscription on member interfaces.
• QSFP28 ports in 2x16GFC mode support 32GFC oversubscription. SFP+ port groups in 2x16GFC mode do not support 32GFC
oversubscription. 2x16GFC mode activates subports 1 and 3.
• QSFP28 ports in 4x16GFC mode support 32GFC oversubscription.
Breakout interfaces:
• To congure breakout interfaces on a unied port, use the mode {FC | Eth} command in Port-Group Conguration mode. The
mode {FC | Eth} command congures a unied port to operate at line rate and guarantees no trac loss.
• To congure breakout interfaces on a QSFP+ Ethernet port, use the interface breakout command in global Conguration mode.
1GE mode: Only SFP+ ports support 1GE; QSFP+ and QSFP28 ports 25 to 30 do not support 1GE.
To view the ports that belong to each port group, use the show port-group command.
Unied port groups
In an OS10 unied port group, all ports operate in either Ethernet or Fibre Channel mode — you cannot mix modes for ports in the same
unied port group. To activate Ethernet interfaces, congure a port group to operate in Ethernet mode and specify the port speed. To
activate Fibre Channel interfaces, see Fibre Channel interfaces.
On the S4148U-ON switch, the available Ethernet and Fibre Channel interfaces in a port group depend on the currently congured port
prole. For more information, see S4148U-ON port proles.
Figure 2. S4148U-ON unied port groups
To enable Ethernet interfaces in a unied port group:
1 Congure a unied port group in CONFIGURATION mode. Enter 1/1 for node/slot. The port-group range depends on the switch.
port-group node/slot/port-group
2 Activate the unied port group for Ethernet operation in PORT-GROUP mode. To activate a unied port group in Fibre Channel mode,
see Fibre Channel interfaces. The available options depend on the switch.
mode Eth {100g-1x | 50g-2x | 40g-1x | 25g-4x | 10g-4x}
• 100g-1x — Reset a port group to 100GE mode.
• 50g-2x — Split a port group into two 50GE interfaces.
• 40g-1x — Set a port group to 40GE mode for use with a QSFP+ 40GE transceiver.
• 25g-4x — Split a port group into four 25GE interfaces.
• 10g-4x — Split a port group into four 10GE interfaces.
3 Return to CONFIGURATION mode.
exit
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Interfaces