Reference Guide

*profile-1 and profile-2 activate the same port mode capability on unied and Ethernet ports. The dierence is that in

profile-1, by default SFP+ unied ports 1-24 come up in Fibre Channel mode with 2x16GFC breakouts per port group. In profile-2,

by default SFP+ unied ports 1-24 come up in Ethernet 10GE mode. profile-1 allows you to connect FC devices for plug-and-play;

profile-2 is designed for a standard Ethernet-based data network.

**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 25-30 do not support 1GE.

To view the ports that belong to each port group, use the show port-group command.

Congure breakout mode

Using a supported breakout cable, you can split a 40GE QSFP+ or 100GE QSFP28 Ethernet port into separate breakout interfaces. All

breakout interfaces have the same speed. You can set a QSFP28 port to operate in 40GE mode with a QSFP+ transceiver.

interface breakout node/slot/port map {10g-4x | 25g-4x | 40g-1x | 50g-2x |

100g-1x}

• node/slot/port — Enter the physical port information.

• 10g-4x — Split a QSFP28 or QSFP+ port into four 10G interfaces

• 25g-4x — Split a QSFP28 port into four 25G interfaces.

• 40g-1x — Set a QSFP28 port for use with a QSFP+ 40G transceiver.

• 50g-2x — Split a QSFP28 port into two 50G interfaces.

Interfaces