EIGRP Summary
The characteristics of EIGRP follow:
- Hybrid routing protocol (distance vector that has link-state protocol characteristics).
- Use DUAL, first proposed by E. W. Dijkstra and C. S. Scholten, to perform distributed shortest-path routing while maintaining freedom from loops at every instant. Although many researchers have contributed to the development of DUAL, the most prominent work is that of J. J. Garcia-Luna-Aceves.
- Cisco Proprietary created in 1994.
- First released in IOS 9.21
- Uses IP protocol 88.
- Makes Automatic summarization on network Class boundary.
- Classless protocol (supports VLSM).
- Have the power to shut the Auto-summarization And make a configured manual Summarization.
- Default composite metric of bandwidth and delay.
- You can factor load, MTU and reliability into the metric.
- Eigrp metric is the same as IGRP*256, It uses the smallest B.W,Reliablity,Load & MTU with the Comulative delay upon the path…..The MTU doesn’t actually used in the Metric calculations, But is included in the EIGRP Routing updates.
- Sends route updates to multicast address 224.0.0.10, and nei. Reply’s back with Unicast Address.
- Sends non-periodic, partial, and bounded updates.
- Send Hello packets every 5 sec. and Hold down timer is 15 sec.
