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EIGRP Basic Setup Steps | Blog

Aug 23
EIGRP

EIGRP Basic Setup Steps

EIGRP is an advanced distance vector protocol which is developed by Cisco. It uses the distance vector algorithm and distance information similar to IGRP. However, the convergence properties and the operating efficiency has improved substantially.

The convergence technology is based on the Diffusing Update Algorithm (DUAL). This algorithm ensures loop-free operation throughout the route computation and allows all devices involved in a topology change to synchronize within same time frame. Routers which does not get affected by topology changes are not involved in re-computation.

EIGRP uses a three-step model which comprises of neighbour discovery, topology exchange and choosing routes. Each step leads to a list or a table on a router such as neighbour table, topology table and the routing table.

This article will guide you through the basic configuration required to implement EIGRP. Perform these steps on all the routers in your internetwork.

Step1: Use the router eigrp as-number global command to enter EIGRP configuration mode and define the EIGRP autonomous system number (ASN). Example:

Router9>enable

Router9#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router9(config)#router eigrp 1

Router9(config-router)#

Step2: Configure one or more network ip-address wildcard-mask router subcommands. This will enable EIGRP on all matched interface and will cause EIGRP to advertise the connected subnet. Example:

Router9(config)#router eigrp 1

Router9(config-router)#network 10.0.0.0 0.255.255.255

OR

Router9(config)#router eigrp 1

Router9(config-router)#network 10.0.0.0  (must be classful network number)

Step3: (Optional) Use the EIGRP router-id value router subcommand to set the EIGRP router ID explicitly. Example:

Router9(config-router)#eigrp router-id 1.1.1.1

Step4: (Optional) Use the ip hello-interval eigrp asn time and ip hold-time eigrp asn time interface subcommands to change the interface hello and hold timers. But be careful while making such changes as if not configured same on all routers might cause a bottleneck. Example:

Router9(config-if)#ip hello-interval eigrp 1 5

Step:5: (Optional) Use the bandwidth value and delay value interface subcommands to impact metric calculations by tunning bandwidth and delay.

Step6: (Optional) Use maximum-paths number and variance multiplier router subcommands to configure support for multiple equal-cost routes.

Step7: (Optional) Use the auto-summary router subcommand to enable automatic summarization of routes at the boundaries of classful IPv4 networks.

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