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Using the iLink Message Specification

This section describes the features common to each message layout in the iLink message specification.


To avoid client systems impacts, CME Group recommends that client systems NOT submit iLink messages containing FIX tags that are not defined in the iLink message specification.

Standard Header and Trailer

For each FIX4.2 message type sent over iLink, there is a standard header for outbound messages (from client system to CME Globex) and a standard header for inbound messages (from CME Globex to client system). The header for inbound and outbound FIX 4.2 message types sent over iLink is presented separately and referred to in subsequent message type layouts as 'Standard Header'. There is also a standard trailer for all FIX 4.2 message types.