Users Guide

1GE mode: 1GE is supported only on SFP+ ports; 1GE is not supported on QSFP+ and QSFP28 ports 25-26.
Breakout interfaces: Use the interface breakout command in Configuration mode to configure 4x10G, 4x25G, and
2x50G breakout interfaces.
To view the ports that belong to each port group, use the show port-group command.
S4148U-ON port profiles
S4148U-ON port profiles determine the available front-panel unified and Ethernet ports and supported breakout interfaces.
In the port profile illustration, blue boxes indicate the supported Ethernet port modes and breakout interfaces. Brown boxes
indicate the supported Fibre Channel port modes and breakout interfaces. Blank spaces indicate ports and speeds that are not
available. Unified port groups are numbered 1 to 10.
S4148U-ON unified port modes—SFP+ ports 1-24 and QSFP28 ports 25-26 and 29-30:
● 10GE is an SFP+ port in Ethernet mode or a 4x10G breakout of a QSFP+ or QSFP28 port in Ethernet mode.
● 25GE is a 4x25G breakout of a QSFP28 Ethernet port.
● 40GE is a QSFP+ or QSFP28 Ethernet port that uses QSFP+ 40GE transceivers.
● 50GE is a 2x50G breakout of a QSFP28 Ethernet port.
● 100GE is a QSFP28 Ethernet port.
● 4x8GFC are breakout interfaces in an SFP+ or QSFP28 FC port group.
● 2x16GFC are breakout interfaces (subports 1 and 3) in an SFP+ or QSFP28 FC port group.
● 4x16GFC are breakout interfaces in a QSFP28 FC port group.
● 1x32GFC (subport 1) are breakout interfaces in a QSFP28 FC port group.
S4148U-ON Ethernet modes—QSFP+ ports 27-28 and SFP+ ports 31-54:
● 10GE mode is an SFP+ 10GE port or a 4x10G breakout of a QSFP+ port.
● 40GE mode is a QSFP+ port.
For example, all S4148U-ON activate support 10G speed on unified ports 1-24 and Ethernet ports 31-54, but only profile-1
and profile-2 activate QSFP+ ports 27-28 in 40GE mode with 4x10G breakouts. Similarly, all S4148U-ON profiles activate
8GFC speed on unified ports 1-24, but only profile-1, profile-2, and profile-3 activate 2x16GFC in port groups 1-6. In
QSFP28 port groups, profile-1 and profile-2 support 1x32GFC; profile-3 and profile-4 support 4x16GFC.
*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.
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Interfaces