What is the largest allowed value for SeqNumber(34) ? unlimited ? 32-bit int ? 64-bit int ?


SeqNumber(34) is of int data type.
Is there a maximum value defined by FIX standard for SeqNumber(34) ?
If there is a maximum value, what should happen after reaching the maximum value ? reset back to zero or disconnect the session ?


In FIX4 and FIXT specifications, no maximum value is given for SeqNum datatype. If a firm has a limitation in their FIX implementation, they should communicate that to counterparties in rules of engagement.