- EIGRP is a Cisco proprietary protocol.
- It has two AD values (Internal – 90, External – 170 )
- Fast Convergence.
- Uses Dual (Diffusing update algorithm).
- No periodic Updates only triggered updates.
- Triggered updates only changes occurred.
- Consumes less bandwidth.
- Multiple network layer support (IPV4, IPV6).
- Use of multicast (224.0.0.10) and unicast.
- Variable-length subnet masking (VLSM) support.
- Composite metric.
- Unequal load balancing (improve use of traffic).
- Protocols number is 88.
- Summarization can be enable in any interface. (Reduce the size of the routing table).
- Uses Hello packets to ensure the neighbour is still alive.
- Reliable Transport Protocol (RTP) responsible for guarantee the EIGRP packets delivery to all neighbors.
Introduction to EIGRP
The Lazy Networker 
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