# OSI Layers in Routing Protocols

DevFeed: [OSI Layers in Routing Protocols](<https://devfeed.tech/articles/osi-layers-in-routing-protocols-10969.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2024/03/routing-protocols-osi-layers/>)

Published: 2024-03-26T05:53:00Z

Content type: article

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>), [networking](<https://devfeed.tech/topics/networking.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [IS-IS](<https://devfeed.tech/topics/is-is.md>), [BGP](<https://devfeed.tech/topics/bgp.md>)

Tags: [bgp](<https://devfeed.tech/tags/bgp.md>), [is-is](<https://devfeed.tech/tags/is-is.md>), [networking-fundamentals](<https://devfeed.tech/tags/networking-fundamentals.md>), [networks](<https://devfeed.tech/tags/networks.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [routing](<https://devfeed.tech/tags/routing.md>)

## AI overview

The article explains how routing protocols map across the seven OSI layers. It clarifies that IS-IS uses its own network layer, while protocols such as OSPF, EIGRP, RIP, and BGP use different transport mechanisms and implement session, presentation, and application-layer functions.

## Source excerpt

Now and then, someone rediscovers that IS-IS does not run on top of CLNP or IP and claims that, therefore, it must be a layer-2 protocol. Even vendors' documentation is not immune. Interestingly, most routing protocols span the whole seven layers of the OSI stack, with some layers implemented internally and others offloaded to other standardized protocols. Read more ...