EIGRP: Packet Format

EIGRP Packets are carried in IP Packets using protocol 88.  Max length of the EIGRP packet is derived from the Max IP MTU on the interface.

Each EIGRP packet carries a 20byte header followed by  the body that holds the various TLVs.

TLVs carry multiple pieces of information such as K values, hold timers, control information, and route reachability information.  Flags, Sequence number, and Acknowledgement number fields are the ones that provide most RTP functionality in EIGRP.

EIGRPPacketFormat.PNG

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