Dell SmartFabric OS10 User Guide Release 10.5.3

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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.

NOTE:

You cannot configure the 40G ports 13, 14, 15, 16, 29, 30, 31, and 32 to split into four 10G interfaces on the S6010 platform.
Depopulated QSFP56 ends of the QSFP56-DD to 4x100G depop-QSFP56 copper DAC breakout cables are not supported on the following:
- Legacy 100G platforms such as the S5200-ON and S4100-ON series switches
- 100G QSFP28 ports

Cables and Optics - Supported speeds

The following table lists the cables and optics, and the supported speeds:

Table 1. Supported speedsSupported speeds
Cables and Optics	Supported speeds
100G DAC	100G, 40G, 2x50G, 4x25G, 4x10G
100G Fiber optics	100G, 4x25G (SR4, ESR4, PSM4 can support physical breakout)
40G DAC	40G, 4x10G
40G Fiber optics	40G, 4x10G (SR4, ESR4, PSM4 can support physical breakout)
10G DAC	10G
10G Fiber optics	10G
1G Fiber optics	1G
1G Cu SFP	1G (100M, 10M, or both speeds can be supported in certain switches)
10G Cu SFP+	10G (1G, 100M, or both speeds can be supported in certain switches)
2x100G QSFP28-DD DAC	2x100G, 2x40G, 2x50G, 8x25G, 8x10G, 4x25G, 4x10G
2x100G QSFP28-DD Fiber optics	2x100G, 8x25G, 4x25G
2x40G QSFP-DD Fiber optics	2x40G, 8x10G, 4x10G
200G/80G QSFP28-DD Fiber optics	2x100G, 2x40G, 8x25G, 8x10G, 4x25G, 4x10G
25G DAC	25G, 10G
25G Fiber optics	25G
4x25G breakout DAC	25G
8x25G breakout DAC	25G
2x50G breakout DAC	50G
400G DAC	400G, 2x200G PAM4, 2x100G NRZ, 2x40G, 4x100G PAM4, 4x50G PAM4, 4x25G, 4x10G, 8x50G PAM4, 8x25G, 8x10G
400G eDR4 to 100G FR	100G PAM4 to 100G NRZ

NOTE: Ensure that you configure the breakout mode based on the supported speeds listed in this table. If you configure an unsupported speed, you might see port flapping issues.

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    -

NOTE: In order to ascertain that interfaces are operational without any glitches in the network, Dell Technologies recommends you to ensure that media speed matches with the configured port mode or breakout speed.

Breakout Mode Restrictions

On the S5232F-ON switch, port 32 alone cannot be split into 10x4 or 25x4. Supported breakout modes for port 32 are:

100G-1x Breakout to 1 100G interface
50G-2x Breakout to 2 50G interfaces
40G-1x Breakout to 1 40G interface

NOTE: In the S5448F, the 100G depop-QSFP56 DAC breakout cables support 100G (2x50G PAM4) instead of 100G (4x25G NRZ) breakout configuration; also, this configuration is supported only in the QSFP56-DD port with 100g-4x port configuration.