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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 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.

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.

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:

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.
  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.

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.