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3. Carrying Link-State Information in BGP

This specification contains two parts: definition of a new BGP NLRI that describes links, nodes, and prefixes comprising IGP link-state information and definition of a new BGP path attribute (BGP-LS attribute) that carries link, node, and prefix properties and attributes, such as the link and prefix metric or auxiliary Router-IDs of nodes, etc.

It is desirable to keep the dependencies on the protocol source of this attribute to a minimum and represent any content in an IGP-neutral way, such that applications that want to learn about a link-state topology do not need to know about any OSPF or IS-IS protocol specifics.

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