Reference Guide

Table Of Contents

**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.

Congure breakout mode

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

• 100g-1x — Reset a QSFP28 port to 100G speed.

To congure an Ethernet breakout interface, enter the interface ethernet node/slot/port:subport command in

CONFIGURATION mode.

Each breakout interface operates at the congured speed. Enter the no version of the interface breakout command to reset a port

to its default speed — 40G or 100G.

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

Congure interface breakout

OS10(config)# interface breakout 1/1/7 map 10g-4x

Display interface breakout

OS10# show interface status

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Port Description Status Speed Duplex Mode Vlan Tagged-Vlans

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Eth 1/1/1 down 0 auto -

Eth 1/1/2 down 0 auto A 1 -

Eth 1/1/7:1 down 0 auto A 1 -

Eth 1/1/7:2 down 0 auto A 1 -

Eth 1/1/7:3 down 0 auto A 1 -

Eth 1/1/7:4 down 0 auto A 1 -

Eth 1/1/25 down 0 auto A 1 -

Interfaces