Explain the difference between eBGP and iBGP and when would you use each?

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Explaining the Difference Between eBGP and iBGP

Border Gateway Protocol (BGP) is a key routing protocol used in the Internet. Within BGP, there are two variations: External BGP (eBGP) and Internal BGP (iBGP).

External BGP (eBGP)

eBGP is used to establish BGP peering sessions between routers in different autonomous systems. It is typically used to exchange routing information between different organizations or service providers. eBGP peering requires the use of different AS numbers for the connecting devices.

Internal BGP (iBGP)

iBGP, on the other hand, is used to establish BGP peering sessions within the same autonomous system. It is used for distributing routing information internally within an organization or network. iBGP peering requires the use of the same AS number for the connecting devices.

When to Use Each?

Generally, eBGP is used when connecting routers between different autonomous systems, while iBGP is used within the same autonomous system. eBGP is ideal for interconnecting diverse networks, while iBGP is suited for internal network routing within a single entity.

Understanding the distinction between eBGP and iBGP is essential for designing efficient and scalable routing architectures in network environments.

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Focus keyword: BGP, eBGP, iBGP