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Configure Port Speed

Use the steps in this topic to configure port channelization or port speed.

You can channelize ports and configure chassis speed (port speed) on a select set of EX and QFX switches. Port channelization enables you to split a high-speed QSFP or QSFP+ port on a switch into several low-speed ports. For example, you can channelize a 100 Gbps port into four 25 Gbps ports.

Network cabling setup with a breakout cable connecting a QSFP port to multiple SFP+ ports on switches, showing data flow direction.

The following table lists the devices and their respective ports that support port channelization, along with the supported channel speeds:

Model Port Channel Speed
QFX5120-32C 0-30 4x10g, 4x25g, 2x50g
31 2x50g
QFX5120-48T 48-49, 52-53 2x50g
50, 51 4x10g, 4x25g, 2x50g
QFX5120-48Y 48-55 4x10g, 4x25g
QFX5120-48YM 50, 52 4x10g, 4x25g, 2x50g
QFX5130-32CD 0-31 4x10g, 4x25g, 2x50g, 2x100g, 8x50g, 4x100g, 2x200g
EX4650-48Y 48-55 4x10g, 4x25g

The following table lists the devices and their respective ports that support chassis speed configuration, along with the supported speeds:

Note: Chassis speed configuration is available for SFP or SFP+ ports. Note that the SFP and SFP28 ports are grouped in quads (groups of four), and you can configure the speed of the ports only in quads; you cannot configure the speed for a single SFP28 port. The speed set for the first port in a quad gets applied to all the ports in that quad.
Model Port Chassis Speed
QFX5120-48T 0-47 1g, 10g (per quad 0, 4, 8 .. . 44)
QFX5120-48Y 0-47 1g, 10g, 25g (per quad 0, 4, 8 .. . 44)
QFX5120-48YM 0-47 1g, 10g, 25g (per quad 0, 4, 8 .. . 44)
EX4650-48Y 0-47 1g, 10g, 25g ( per Quad 0, 4, 8 .. . 44)

You can view the channelization information for a port by hovering on it on the front panel on the switch details page.

To channelize ports or configure chassis speed on a switch:

  1. In the Mist portal, click Switches > Switch Name to navigate to the switch details page.
  2. Locate the Port tile and click the Advanced tab.
    User interface for configuring network ports with Advanced tab selected. Chassis or Channelization Speed section lists ports et-0/0/16-18 and et-0/0/24, both at 10G speed. Advanced Port Configuration button at the bottom.
  3. Click Advanced Port Configuration.
  4. Specify the following:

    • Port IDs—Use the port selector to specify the ports on which you need to configure the chassis speed or channel speed.

    • Chassis or Channel Speed—Specify the chassis speed or channel speed here. Chassis speed applies only to SFP and SFP+ ports. If you selected QSFP or QSFP+ ports, configuring a speed channelizes the port, enabling you to split the port into several low-speed ports. Available speeds vary depending on the switch model selected.

  5. Click Add.

Once you channelize a port, you can assign port profiles to individual channel speeds.

User interface for configuring network ports with options to assign port IDs, select ports or ranges, add descriptions, enable Up Down Port Alerts, and save or cancel.

Similarly, the campus fabric configuration screen allows you to select the channelized ports while configuring EVPN connections.

To delete a port speed configuration, navigate to the Advanced tab of the Port tile on the switch details page and click the configuration to be deleted and then click Delete Port Config.Advanced Port Configuration interface with fields for Port IDs and Chassis or Channelization Speed set to 10G, options to Delete Port Config, Save, or Cancel.