EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco proprietary routing protocol which even though seems to work like a Distance-Vector protocol is in fact several notches above other routing protocols in the distance-vector domain. While configuring it is a breeze what happens behind the scenes ? What goes in the wire when a “network” router subcommand is issued ? How do things converge quickly when a topology change occurs ? These questions made me create a simple topology in GNS3 and capture packets using wireshark. So join me in unraveling the mystery inside an EIGRP packet.Continue Reading…