Difference Between eBGP and iBGP

When it comes to BGP (Border Gateway Protocol), there are two main types: external BGP (eBGP) and internal BGP (iBGP).

Focus Keyword: eBGP and iBGP

eBGP (External BGP):

eBGP is used when the BGP sessions are established between routers in different autonomous systems (AS). It helps in exchanging routing information between different ASes.

iBGP (Internal BGP):

iBGP, on the other hand, is used for establishing BGP sessions within the same AS. It is used to exchange routing information between routers within the same AS.

Key Differences:

• eBGP is used for external routing between different ASes, while iBGP is used for internal routing within the same AS.
• eBGP uses a different AS number for each neighbor, while iBGP uses the same AS number for all routers within the AS.
• eBGP typically has a longer maximum allowable hop count than iBGP.

In conclusion, the main difference between eBGP and iBGP lies in the scope of where they are used and the specifics of how they operate within the BGP framework.