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Technical Overview

LNet is a client-managed connectivity solution providing access to the CME Globex platform along with access to CME Clearing production environments. Customers using LNet are required to house a CME Group-certified trading application at the facility providing the connectivity.

Customers can connect via CME Group-approved 3rd party vendors who provide a proximity hosting service to all market participants.

There are four CME-approved 3rd party vendors. Customers select their vendor based on their individual needs and criteria. One of the CME-approved 3rd party vendors, DRT, provides for a “fully managed” solution. The self-managed solution allows customers to secure data center space and connectivity and perform the maintenance and daily support of the technical environment. The “fully-managed” solution includes vendor-provided space, connectivity, technical maintenance, and daily services. The customer owns the relationship with the 3rd party vendor and negotiates terms and conditions with the vendor as needed.

Refer to the Customer Requirements topic below for specific contact information. The customer or customer’s service provider is required to have fiber directly to the respective Meet Me Room (MMR). This option is not available to exchanges other than Participating Exchanges.

Circuit Specifications
  • 1 Gbps hand-off
  • 10 Gbps hand-off
  • Single Mode Fiber
  • 10G-LR (10GBASE-LR)

LNet connectivity provides access to:

  • CME Globex Platform, which includes:
    • CME Market Data Platform
    • CME iLink®  order routing interface
  • CME Clearing House Systems


All connections at the 3rd party hosting facility are single-mode fiber.
LNet Connectivity Procedures
Customer Requirements

LNet Customers must meet the following requirements:

  • Have or establish a presence with a CME Group-approved 3rd party hosting facility where the connection will be established.
  • Note that the level of service provided by the vendors may vary. Some offer full service hosting, others provide the space and allow the customer to self-manage.
  • Contact information for 3rdparty vendors offering “full service” hosting:
  • Contact information for 3rdparty vendor who provides a self-managed solution:
  • Please note that floor and suite location must be included on the Access Request Form or Schedule 2.
  • Although CME Group facilitates the cross connect requests within the hosting facility, it is the customer’s responsibility to complete and/or approve any vendor agreements that may be applicable.
  • Provide two routers or Layer 3 switches that will terminate each 1 Gbps, single-mode fiber cross-connect.
  • The point-to-point IP address must be configured on the interface closest to CME Group device.
  • CME Group recommends that the customer checks the Signal/Light levels at the time of turn up in order to attenuate levels to protect equipment.
  • Verify connectivity requirements with the respective vendor.
  • Avoid using media converters.
  • The customer’s SFP or GBIC must be compatible with long wavelength/long haul (1000BASE-LH) SFPs.
  • Please note there are specific prerequisites for firms interested in becoming a CME Group-approved 3rd party vendor that provides proximity services. Please contact your Global Account Manager for more information.
Routing Requirements

Customer routers must be capable of using advanced TCP/IP Protocols including BGP and multicast, specifically PIM Sparse Mode.

  • BGP routing must be used on the routers terminating CME Group connections.
  • It is recommended that customers use a routing protocol between their routers to provide automatic failover.
  • All IP packets destined for CME Group must be sourced from CME Group-assigned private address space.
  • Multicast PIM Sparse Mode must be used.

The following restrictions apply to LNet connectivity:

  • No site-to-site connectivity.
  • No direct server connectivity into CME Globex.
  • Terminating the circuit on a Layer 2 device is not allowed.
  • CME Group will not accept traffic sourced from any customer’s public IP space.
  • Only one Market Data Platform data feed per router is allowed.
  • Customer hardware must be capable of supporting quote streams (e.g., PIM sparse mode).
  • Customer equipment must be in CME approved space
Establishing LNet Connectivity

Use the following procedure to establish connectivity:


  1. Customer leases space from one of the vendors at the facility (unless customer already has a presence at one of the CME-approved 3rd party hosting facilities).
  2. Customer submits all required executed paperwork, including Schedule 2 Access Request Form with 3rd party cabinet and/or rack information, to their Global Account Manager.
  3. CME Group receives and processes the paperwork, then issues a Letter of Authorization (LOA) to the customer. The LOA contains the CME Group demarcation for the primary and secondary cross-connects.
  4. Customer informs CME Globex Services when the cross-connects are completed and the 2x Layer 3 routers are installed in the rack.
  5. CME Globex Services schedules a physical site survey with the customer.
  6. CME Globex Services schedules a network connectivity test. CME Group requires that a knowledgeable contact from the firm on site attends the site survey as well as the NSA (circuit turn up).

    Testing will be scheduled for a specific weekday after 4:30 pm Central Time which requires customer participation.

  7. Upon successful test, CME Group notifies customer of completion and billing commences.
    Please see for LNet fee information.
  8. Please contact Global Account Managment (GAM)Contact Information for Router Guidance.