Resend Request logic is the Drop Copy session mechanism by which a given system, upon detecting a higher than expected message sequence number from its counterparty, requests a range of ordered messages resent from the counterparty. The counterparty resends the requested message range sequentially until both systems are back in sequence.
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During normal resend processing, the Sequence Reset - Gap Fill (35=4, 123=Y) message is used when the sending application chooses not to resend specific messages (e.g., stale orders or administrative messages).
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In response to the Resend Request from the client system, CME Group will send all non-administrative messages for the requested range.
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