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Login Message Flow

On a successful login, the following is the sequence of messages to expect. Note that after sending a Login Request, participants should wait for both a Login Response of "Accepted" as well as a Replay Complete message before sending new application messages.

Table 1. Login Message Flow
DirectionMessage
Member → CboeLogin Request
Member ← CboeLogin Response ( A = Accepted)
Member ← Cboe
  • For each matching unit, all messages for the member having sequence number greater than the seq # in the login request for that unit.
  • Possibly no such messages are transmitted, for instance on the first login of the day.
Member ← CboeReplay Complete
Member ←→ Cboe(Begin normal flow: Order traffic, or Heartbeats at 1/sec)
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