Reference Guide

**Oversubscription: Congure oversubscription to support bursty storage trac on a Fibre Channel interface. Oversubscription allows a

port to operate faster, but may result in trac loss. To support oversubscription, use the speed command in Interface Conguration mode.

This command is not supported on an Ethernet interface. In S4148U-ON port proles:

• 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 congure breakout interfaces on a unied port, use the mode {FC | Eth} command in Port-Group Conguration mode. The

mode {FC | Eth} command congures a unied port to operate at line rate and guarantees no trac loss.

• To congure breakout interfaces on a QSFP+ Ethernet port, use the interface breakout command in global Conguration 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.

Unied port groups

In an OS10 unied port group, all ports operate in either Ethernet or Fibre Channel mode — you cannot mix modes for ports in the same

unied port group. To activate Ethernet interfaces, congure 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 congured port

prole. For more information, see S4148U-ON port proles.

Figure 2. S4148U-ON unied port groups

To enable Ethernet interfaces in a unied port group:

1 Congure a unied 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 unied port group for Ethernet operation in PORT-GROUP mode. To activate a unied 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

Interfaces