breakout mode

Usage Guidelines

You do not need to reboot a device for the breakout configuration change to take effect.

When you configure a breakout mode on an Ethernet port, the original interface is de-configured and deleted. The new breakout interfaces in the default configuration are created automatically. These new interfaces are identified with the name of the original interface followed by a suffix. For example, the breakout interfaces of connector 0/25 have the following naming convention:

interface ethernet 0/25:1
interface ethernet 0/25:2
interface ethernet 0/25:3
interface ethernet 0/25:4

Use the no form of the command to reset the port to non-breakout mode. When you run the no form of the command, the breakout interfaces are de-configured and deleted. The original Ethernet interface in the default configuration is created automatically.

To switch from one breakout mode to another, set the port to non-breakout mode and then run the command to configure the new breakout mode.

(SLX 9250) This platform supports only the 4x1g breakout mode, which supports the redundant management interface feature. This feature is used with Mellanox network adapters and 1GB copper SFPs.

(SLX 9150, SLX 9540, SLX 9640, and Extreme 8520) These platforms support the 4x10g and 4x25g breakout modes. The number of connectors and connector IDs that support the breakout function varies by platform. For more information, see the Technical Specifications guide for your platform.

(Extreme 8720) This platform supports the 4x10g and 4x25g breakout modes on all ports.

(SLX 9740/Extreme 8820) These platforms have breakout restrictions related to port macros (PM). A PM is a port group. Each PM has four ports, which are contiguous. PM0 has ports 0/1 – 0/4, PM1 has ports 0/5 – 0/8, PM2 has ports 0/9 – 0/12, and so on. In any PM, 40g and 10g ports cannot coexist with 25g ports. The following configurations are not supported.

• If any port in a PM is configured as 40g or 4x10g breakout, no 4x25g breakout is allowed in the PM unless the 40g ports will be removed as part of the breakout operation. For example:

  • If 0/1 or 0/2 is 40g, you cannot configure 0/3 as 4x25g breakout.
  • If 0/1 or 0/2 is 40g, you can configure 0/1 as 4x25g breakout because 0/1 and 0/2 will be removed.

• If 4x25g breakout is configured in a PM, no 40g or 4x10g is allowed in the PM. For example:

  • If 0/1 is configured as 4x25g breakout, you cannot configure 0/3 or 0/4 as 40g.
  • If 0/3 is configured as 4x25g breakout, you cannot configure 0/1 as 4x10g breakout.

• Breakout is allowed only on odd ports. Breakout is not allowed on the following ports:

  • 0/5, 0/7 - on SLX 9740-40C/Extreme 8820-40C devices
  • 0/5, 0/7, 0/45, 0/47 - on SLX 9740-80C/Extreme 8820-80C devices

• Only 100G is allowed on the following ports:

  • 0/5, 0/6, 0/7, 0/8 - on SLX 9740-40C/Extreme 8820-40C devices
  • 0/5, 0/6, 0/7, 0/8, 0/45, 0/46, 0/47, 0/48 - on SLX 9740-80C/Extreme 8820-80C devices