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A hello protocol is used by link-state (OSPF, IS-IS) and advanced link-state routing protocols (EIGRP) running on a router to detect it's neighbors. Certain conditions need to be fulfilled to be established as a neighbor in the router's neighbor table. A hello protocol is a simple and light way for routers running the above mentioned protocols to detect and record the neighbors they are connected to. Once a reply is received from a neighbor for a "Hello" message, the address and interface information is stored in the neighbor table.
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