2.2.5.1 Base Header Format
This Base header MUST be used when the Type of Service value in the Demultiplex header is set to 0x02 (QoS diagnostics) and the Function value is in the range 0x00 (QosInitializeSink) to 0x07 (QosAck).
The Base header format MUST be the following.
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2 |
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3 |
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Real_Destination_Address |
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Real_Source_Address |
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Sequence_Number |
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Real_Destination_Address (6 bytes): This field specifies the intended destination's real MAC address.
Real_Source_Address (6 bytes): This field specifies the sender's real MAC address.
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A sender MUST set the real source and destination MAC addresses to its own MAC address and its intended destination MAC address, respectively. This field is required because some network devices rewrite the Source Address and Destination Address fields of the Ethernet header and thus might not survive an end-to-end transmission.
Sequence_Number (2 bytes): This field specifies the sequence number that correlates a response (QosReady, QosQueryResp, QosError, or QosAck) to a specific request (QosInitializeSink, QosProbe, QosQuery, or QosReset). The correlation provided by the sequence number enables request senders to ensure a response is received for a given request.