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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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ETS Operation with DCBx

The following section describes DCBx negotiation with peer ETS devices.

In DCBx negotiation with peer ETS devices, ETS configuration is handled as follows:
  • ETS TLVs are supported in DCBx versions CIN, CEE, and IEEE2.5.
  • The DCBx port-role configurations determine the ETS operational parameters (refer to Configure a DCBx Operation ).
  • ETS configurations received from TLVs from a peer are validated.
  • If there is a hardware limitation or TLV error:
    • DCBx operation on an ETS port goes down.
    • New ETS configurations are ignored and existing ETS configurations are reset to the previously configured ETS output policy on the port or to the default ETS settings if no ETS output policy was previously applied.
  • ETS operates with legacy DCBx versions as follows:
    • In the CEE version, the priority group/traffic class group (TCG) ID 15 represents a non-ETS priority group. Any priority group configured with a scheduler type is treated as a strict-priority group and is given the priority-group (TCG) ID 15.
    • The CIN version supports two types of strict-priority scheduling:
      • Group strict priority: Use this to increase its bandwidth usage to the bandwidth total of the priority group and allow a single priority flow in a priority group. A single flow in a group can use all the bandwidth allocated to the group.
      • Link strict priority: Use this to increase to the maximum link bandwidth and allow a flow in any priority group.
    CIN supports only the dot1p priority-queue assignment in a priority group. To configure a dot1p priority flow in a priority group to operate with link strict priority, you configure: The dot1p priority for strict-priority scheduling ( strict-priority command; Enabling Strict-Priority Queueing ).

    If you configure only the priority group in an ETS output policy or only the dot1p priority for strict-priority scheduling, the flow is handled with group strict priority.

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