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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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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 default ETS settings.
  • 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.
      NOTE 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). The priority group for strict-priority scheduling (scheduler strict command.

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