Dell S4148U-ON OS10 Enterprise Edition User Guide Release 10.4.0E R2 - Page 84
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**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. 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. Configure interface breakout OS10(config)# interface breakout 1/1/7 map 10g-4x Display interface breakout OS10# show interface status Port Description Status Speed Duplex Mode Vlan Tagged-Vlans 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 - 84 Interfaces
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