API Guide

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.
● 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 to 30 do not support 1GE.
To view the ports that belong to each port group, use the show port-group command.
Configure negotiation modes on interfaces
On OS10, the auto negotiation mode is enabled by default.
To force negotiation, use the following command:
negotiation on
266
Interfaces