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Link Layer Topology Discovery Protocol Specification

Updated: September 1, 2010

The Link Layer Topology Discovery (LLTD) specification describes how the LLTD protocol operates over wired (802.3 Ethernet) and wireless (802.11) media. LLTD enables device discovery via the data-link layer and determines the topology of a network. This specification also describes the Quality of Service (QoS) Extensions that enable stream prioritization and quality media streaming experiences, even on networks with limited bandwidth.

The LLTD specification is licensed on a royalty-free and self-help click-through basis for devices with limitations on targeted platforms. Non-Windows computer devices can get a royalty-bearing or fee-based license by contacting the Microsoft Intellectual Property and Licensing team.

See also:  Windows Rally Development Kit 


Link Layer Topology Discovery Protocol Specification

MICROSOFT WINDOWS RALLY COMPONENT LICENSE AGREEMENT

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Recitals

Microsoft has developed certain "Windows Rally" technologies that are intended to facilitate certain tasks performed by or in conjunction with network connected devices, including communications protocols. Licensee desires a license from Microsoft to access, view or implement the Licensed Specification(s), and to use the corresponding Technical Documentation (as defined below) for the purpose of such implementation(s).

1. Definitions

1.1 "Affiliate" means, with respect to any legal entity, any other such entity directly or indirectly Controlling, Controlled by, or under common Control with such entity. "Control" means the power to direct the management of a legally recognizable entity.

1.2 "Game Console" means any computing system that has interactive gaming as its primary functionality and is not designed, marketed or capable of performing the functions of (or replacing) a server, personal computer, laptop, netbook, tablet, slate or smartbook.

1.3 "General Purpose Computing Device" means any server, personal computer, laptop, netbook, tablet, slate, smartbook or other device that: (i) contains processor(s), permanent and temporary memory storage device(s), and an operating system; (ii) is capable as shipped or enabled by the manufacturer or its designee of executing personal productivity applications (such as word processing, spreadsheet, database, personal information management, image editing, or financial management); (iii) is not a Game Console or Mobile Phone; and (iv) is shipped without a Microsoft operating system.

1.4 "Consumer Product" means a consumer ready device (other than a General Purpose Computing Device) that is capable of implementing the Licensed Specification and that is built by Licensee and branded with a trademark owned, controlled or licensed by Licensee. For purposes of this Agreement, a "consumer ready device" is a hardware device marketed primarily to consumers as a cohesive unit and not as a component of another single unit device.

1.5 "Licensed Specification" means only the LLTD and PNP-X Specifications as described in the Technical Documentation.

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1.9 "Required Portions" means all portions of the Licensed Specification with the exception of any portions that are expressly identified by Microsoft as being "optional."

1.10 "Technical Documentation" means Microsoft's proprietary technical documentation for the Licensed Specification(s) as available at http://www.microsoft.com/whdc/connect/rally/default.mspx or successor websites.

2. Licenses

2.1 Copyright License. Microsoft grants to Licensee a non-exclusive, royalty-free, non-sublicensable, nontransferable, personal, worldwide license under Microsoft copyrights in the Technical Documentation to copy the Technical Documentation for use solely in exercising its rights under Section 2.2.

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"This source code incorporates intellectual property owned by Microsoft Corporation and cannot be made, used, sold, offered for sale, imported or redistributed without a license from Microsoft Corporation. If you would like a license from Microsoft, you need to contact Microsoft directly (send mail to rally@microsoft.com)."

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2.6 License Termination. If You or Your Affiliate file, maintain, or voluntarily participate in a patent infringement lawsuit against a Microsoft implementation of any Licensed Specification, then this Agreement, and all rights granted to You under this Agreement, will terminate without any additional notice from Microsoft.

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