the main that IBGP is formed between Neighbors within the same AS whereas EBGP is formed between neighbors in different AS There are many others differences between IBGP and EBGP for IBGP peers dont need to be directly connected. regarding route selection, ebgp route is preferred than ebgp route A route learnt from an IBGP peer will not be advertised back to another IBGP by default in order to preventing loops Attributes like local preference are sent to the IBGP peers but not to an EBGP peer which is using the MED routes received from an IBGP peer cannot be advertised to another IBGP peer but can be advertised to an EBGP peer