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Ask the Expert- SD-WAN

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Beginner

RIP..

hi..

Whats the reason for RIP working in application layer and all other routing protocols in network layer..or is there any particular reason for this design..

Thanks

Thomas.

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Enthusiast

Re: RIP..

All routing protocols are considered to work at Layer 3 (Network Layer) of the OSI reference model. RIP does use UDP (Transport Layer) for message transfers but functionality wise it is still a Layer 3 protocol. From where did you get the information that RIP works at the application layer?

Beginner

Re: RIP..

Hi a.awan,

Thanks for your reply.I found this info in the CCNA(2.0)Cisco press book.I was asked this question in a technical interview also...

Thanks

Thomas

Enthusiast

Re: RIP..

Interesting. Well must be an error then.

Advocate

Re: RIP..

I agree with Atif. The only possible reason I can think of for saying that RIP is application layer is that it uses UDP as a transport. Apart from that, it shows all the characteristics of layer-3. It serves layer-3 (routing). The scope of the RIP packet is a single network - it passes from router-to-router, and not through routers.

It is one of those cases where the OSI model does not look quite so orthogonal. There are a few such cases where the nesting of the protocols seems to break the OSI model - tunnelling is another.

I think this is a case of "give them the answer they want to hear, even if it is not really correct".

Kevin Dorrell

Luxembourg

Beginner

Re: RIP..

Rip or any other routing protocls will work on network layer only as the serve the purpose of exchanging the routing information.

Rip is not application so it can not work on application layer. Example is fTP it works on application layer and serves the pusrpose of transfering the files.

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