Border Gateway Protocol (BGP)

It's a Path Vector Protocol.

Routing between Autonomous System (AS) Path.

It's process on application layer using TCP protocol 179.

Matrix uses Attributes to select the best path.

Uses on big Network like ISP.

Updates are incremental.

Classless - FLSM, VLSM, CIDER and Auto.

It's a Path vector protocol.

As path loop detection.

Administrative Distance:-

EBGP - 20

IBGP - 200