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Increasing Available Bandwidth on Rich-Queuing MPCs by Bypassing the Queuing Chip

Queuing MPCs contain a queuing chip that enables rich-queuing features such as hierarchical and per-vlan queuing. By default, all traffic passing through an interface on one of these MPCs also passes through the queuing chip, which decreases the available bandwidth of the interface. If you do not require hierarchical or per-vlan queuing on a particular interface of a queuing MPC, you can bypass the queuing chip to increase the available bandwidth.

To bypass the queuing chip on a queuing MPC, you must be running Junos OS Release 14.2 or later.

Starting with Junos OS 18.2R1, you can enable this option on vMX routers to save a vCPU when scheduling is not needed on an interface.

To bypass the queuing chip on an interface on a queuing MPC:

  1. Ensure that neither per-unit-scheduler nor hierarchical-scheduler is configured on the interface.
    Note:

    It is not possible to bypass the queuing chip on an interface if per-unit or hierarchical scheduling is configured on that interface.
  2. Ensure that flexi-queuing-mode is enabled.
  3. Enable bypass-queuing-chip on the interface.

    For example:

  4. Commit your changes.
  5. Verify your changes.

Related Documentation

Release History Table
Release
Description
18.2R1
Starting with Junos OS 18.2R1, you can enable this option on vMX routers to save a vCPU when scheduling is not needed on an interface.
14.2
To bypass the queuing chip on a queuing MPC, you must be running Junos OS Release 14.2 or later.