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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Configuring PFC

Configuring PFC

When a link is congested by traffic of a certain type, PFC stops transmission of such traffic without interrupting traffic of other types.

Pre-configuration Tasks

Before configuring PFC, complete the following tasks:
  • Configuring a link layer protocol so that interfaces at both ends of a link are Up
  • Completing Configuring DCBX before enabling PFC on the interface to set the PFC working mode to auto

If you configure both priority mapping and PFC, exercise caution when modifying the mappings between the priorities of PFC-enabled queues and priorities in the DiffServ domain. Otherwise, PFC may not work.

When the packet forwarding mode on the CX710 switch module 40GE converged switching plane is set to Cut Through, the CX710 switch module 40GE converged switching plane does not support PFC. To use PFC, run the assign forward mode store-and-forward command to change the packet forwarding mode to store-and-forward.


  1. Run:


    The system view is displayed.

  2. (Optional) Run:

    dcb pfc

    The PFC view is displayed.

  3. (Optional) Run:

    priority { start-priority [ to end-priority ] } &<1-8>

    PFC for queues with a specified priority is enabled.

    By default, PFC is enabled for priority 3.

  4. (Optional) Run:


    Exit from the PFC view.

  5. Run:

    interface interface-type interface-number

    The interface view is displayed.

  6. Run:

    dcb pfc enable [ mode { auto | manual } ]

    PFC is enabled on the interface and the PFC working mode is specified.

    By default, PFC is disabled on an interface.


    Set the PFC work mode to manual to improve reliability of FCoE links and prevent problems caused by DCB negotiation failure when the peer device sends multiple types of LLDP packets.

  7. Run:


    The configuration is committed.

Checking the Configuration

  • Run the display dcb [ interface interface-type interface-number ] command to check the DCB configuration and negotiation status.
Updated: 2019-08-09

Document ID: EDOC1000041694

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