Users Guide

• 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 unied 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 proles activate 8GFC speed on
unied 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 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 to 30 do not support 1GE.
To view the ports that belong to each port group, use the show port-group command.
Congure negotiation modes on interfaces
On OS10, the auto negotiation mode is enabled by default.
To force negotiation, use the following command:
negotiation on
Interfaces
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