In this Packet Tracer activity, you will learn how to configure the routing protocol EIGRP using the network shown in the network diagram. A loopback address will be used on the R2 router to simulate a connection to an ISP, where all traffic that is not destined for the local network will be sent. Some segments of the network have been subnetted using VLSM. EIGRP is a classless routing protocol that can be used to provide subnet mask information in the routing updates. This will allow VLSM subnet information to be propagated throughout the network.
- Upon completion of this lab, you will be able to:
- Erase the startup configuration and reload a router to the default state.
- Perform basic configuration tasks on a router.
- Configure and activate interfaces.
- Configure EIGRP routing on all routers.
- Verify EIGRP routing using show commands.
- Disable automatic summarization.
- Configure manual summarization.
- Configure a static default route.
- Propagate default route to EIGRP neighbors.
EIGRP is a hybrid-distance-vector routing protocol. It’s primarily a distance-vector routing protocol, but it also uses the same composite metrics as Interior Gateway Routing Protocol (IGRP). EIGRP uses the Diffusing-Update Algorithm (DUAL) to perform look-free routing and calculate the shortest path.
With EIGRP, two routers form a neighbor relationship and exchange routes. Hello packets (“keepalives”) are present between the two routers; they serve to let each side know if the other goes down or if the link between them goes down.
Typically, these keepalives between neighbors are multicast packets. The type of multicast used is Reliable Transport Protocol (RTP), and communication takes place using the reserved IP address 220.127.116.11.
EIGRP offers the following features:
- Automatic redistribution of routes between IGRP and EIGRP.
- Ability to turn off and on EIGRP and IGRP on individual interfaces of the router.
- Fast network convergence thanks to EIGRP’s DUAL algorithm (convergence is when all routers know about all the networks that every other router is offering).
- Incremental Updates that save network bandwidth and speed convergence.
- Reduced router CPU load, as compared to IGRP.
- EIGRP uses neighbor discovery to find and keep track of neighboring routers. Neighbor discovery uses multicast IP and is not tied to whether or not the IP network is properly configured.
- EIGRP prevents routing loops on the network.
- Supports variable length subnet masks (VLSM).
- Automatic Route Summarization.
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