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How BGP protocol belongs to Application Layer of OSI model?

+3 votes

It is generally said that BGP protocol belongs to Application Layer of OSI model but how is this possible ?

It is made use of by border routers which belongs to level-3 then will that mean border routers are special kind of routers which act at application layer?

How do they differ from general routers?

posted Nov 23, 2014 by Krishnan Goskan

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1 Answer

+2 votes

When OSI refers to an application layer it does not essentially means the end system, BGP operates over the transport layer TCP on port number 179. It was defined in the RFC 1771.

Border Gateway nodes are intermediate nodes and the job is to find out the shortest path to reach an AS. I would suggest please go through the following video which should clarify the working

answer Nov 24, 2014 by Salil Agrawal
are the layers of OSI model physical or conceptual?

by this i mean whether each layer of OSI model is present in one or other physical form(like hardware or software) or is just simply logical(just for us to understand)?
OSI is a model and designed by the fact of logical layers which can be present in the physical form also.
then where is transport layer located if it is physical?
Transport is over network layer??
Similar Questions
+3 votes

Mostly we mention cidr as classless interdomain routing, so I thought of why not there is classful interdomain routing

I want to know what problems are there in classful addressing for interdomain routing

CIDR: stands for classless inter-domain routing
Interdomain Routing: means exchanging information between different networks that are under different administrative control eg. one controlled by IIT and another controlled by (say) AIIMS

Normally this mechanism uses classless addressing of IPv4 so named cidr

Protocol is BGP-Border Gateway Protocol which is a Exterior Gateway Protocol

My doubt is whether this mechanism is possible using classful addressing of IPv4 or if not why it is not possible?

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