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Extraordinary and excessive messaging rates generated by a client system, which can negatively impact all market participants (for example, by creating performance latencies). The CME Globex messaging volume controls are designed to address this risk by:

  • supporting valid trading activity, and
  • preventing a malfunctioning trading system from impacting the markets

To protect all market participants from the negative effects of excessive messaging, CME Group has implemented the messaging controls for iLink Order Entry as described below.

Application Messaging Thresholds

If an iLink session exceeds one or more of the thresholds, as measured in messages per second (MPS) over a pre-defined interval, subsequent messages will be rejected via a Session Level Reject (tag 35-MsgType=3) message until the MPS rate falls below the threshold. The Thresholds are in place for the following Application message types:

Application Messages

  • New Order (tag 35-MsgType=D)
  • Order Cancel/Replace (tag 35-MsgType=G)
  • Order Status Request (tag 35-MsgType=H)
  • Quote Request (tag 35-MsgType=R)
  • New Order Cross (tag 35-MsgType=s)
  • Cancel Request messages (tag 35-MsgType=F)

The thresholds for each message are:

All times:

Cancel1000 MPSThree-second rolling average.

All other application messages

500 MPSThree-second rolling average.

with the following exceptions:

Sundays: 15:00-16:00 Central time (CT) - Order Status Request (tag 35-MsgType=H) only allowed

Monday-Thursday: 16:00-17:00 (CT) - Order Status Request (tag 35-MsgType=H), New Order (tag 35-MsgType=D), Order Cancel/Replace (tag 35-MsgType=G), Cancel Request messages (tag 35-MsgType=F) allowed


New Order and Order Cancel/Replace

100 MPSThree-second rolling average.

The Application message types Security Definition Request, Mass Quote, and Quote Cancel are not subject to these Messaging Controls.

Administrative Messaging Thresholds

If an iLink session exceeds an average of 1000 Administrative messages per second (MPS) over a three-second window, the port  for the iLink session will be closed. Detailed information on CME Globex Port Closure Policy is available online<>.

Administrative Messages include:

  • Logon (tag 35=A)
  • Heartbeat (tag 35=0)
  • Test Request (tag 35=1)
  • Resend Request (tag 35=2)
  • Session Level Reject (tag 35=3)
  • Business Level Reject (tag 35=j)
  • Sequence Reset (tag 35=4)
  • Logout (tag 35=5)
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