Connectivity Guide

● 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 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 to 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, use the interface ethernet node/slot/port:subport command in
CONFIGURATION mode.
Each breakout interface operates at the configured speed. Use 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, use 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 -
Breakout auto-configuration
You can globally enable front-panel Ethernet ports to automatically detect SFP pluggable media in a QSFP+ or QSFP28 port.
The port autoconfigures breakout interfaces for media type and speed. For example, if you plug a 40G direct attach cable (DAC)
with 4x10G far-side transceivers into a QSFP28 port, the port autoconfigures in 10g-4x Interface-breakout mode.
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Interfaces