iLink Functional Specification
The iLink order entry protocol on CME Globex provides:
Simple Binary Encoding (SBE) - optimized for low latency of encoding and decoding
FIX Performance (FIXP) protocol - supports simple session layer management; no session-level information (e.g. headers) required
Optimized order entry on the CME Globex platform for futures, options, BrokerTec, and EBS markets
Lean messages move administrative information out of order entry business message
Standard message size, fixed positions, and fixed length fields
Consistent encoding method for market data and order entry
XML schema and templates for order entry as with MDP 3
All newly created iLink sessions are created with Cancel on Disconnect (COD) enabled by default. COD is mandatory across all iLink sessions with the exception of iLink CGW sessions for listed derivatives markets, where Clearing Firm Administrators may opt out by submitting a change request via the Firm Admin Dashboard (FADB).
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iLink Gateway Considerations
iLink has the following considerations for Convenience Gateway (CGW), Market Segment Gateway (MSGW), and Drop Copy Gateway (DCGW) customers:
| CGW and MSGW | DCGW |
|---|---|---|
iLink |
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Developing to iLink
The following table summarizes the considerations for client systems developing to iLink:
Layer | Feature | iLink |
|---|---|---|
Presentation | Message encoding | Simple Binary Encoding |
Session | Authentication, Recovery | FIX Performance Session Layer (FIXP) |
Application | Business logic | Improved FIX semantics |
Transport | End-to-end delivery | TCP |
Network | Virtual Circuits, Routing | IP |
System Architecture
This diagram provides an overview of iLink order entry architecture.
CGW sessions
MSGW sessions