Reference Guide

*profile-1 and profile-2 activate the same port mode capability on unified and Ethernet ports. The difference is that
in profile-1, by default SFP+ unified ports 1-24 come up in Fibre Channel mode with 2x16GFC breakouts per port group.
In profile-2, by default SFP+ unified 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: Configure oversubscription to support bursty storage traffic on a Fibre Channel interface.
Oversubscription allows a port to operate faster, but may result in traffic loss. To support oversubscription, use the speed
command in Interface configuration mode. This command is not supported on an Ethernet interface. In S4148U-ON port profiles:
● 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 configure breakout interfaces on a unified port, use the mode {FC | Eth} command in Port-Group configuration
mode. The mode {FC | Eth} command configures a unified port to operate at line rate and guarantees no traffic loss.
● To configure breakout interfaces on a QSFP+ Ethernet port, use the interface breakout command in global
Configuration mode.
1GE mode: Only SFP+ ports support 1GE; QSFP+ and QSFP28 ports 25-30 do not support 1GE.
Configure 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.
● 100g-1x — Reset a QSFP28 port to 100G speed.
To configure an Ethernet breakout interface, enter the interface ethernet node/slot/port:subport command in
CONFIGURATION mode.
Each breakout interface operates at the configured speed. Enter the no version of the interface breakout command to
reset a port to its default speed — 40G or 100G.
To configure breakout interfaces on a unified port, enter the mode {Eth | FC} command in Port-Group Configuration mode.
Interfaces
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