Dec 15

EIGRP Basic Setup Process


EIGRP (Enhanced Interior Gateway Routing Protocol) is a popular routing protocol used in networks. It’s a Cisco proprietary routing protocol that can be used on networks where all the routers are Cisco based. The administrative distance for EIGRP is 90 for internal EIGRP and 170 for external EIGRP. The convergence properties and operating efficiency have been better and much enhanced than the original IGRP. The EIGRP uses DUAL (Diffuse Update Algorithm) for selecting and maintaining the best route to each remote network.

There are two methods of EIGRP configurations:

  1. EIGRP Autonomous System Configuration: 

It’s also called the Classic Configuration Mode as most of the configuration takes place in this method but some setting is configured through the interface configuration mode.

To configure EIGRP under Classic mode let us follow these steps as mentioned below:

Step 1: To create a routing instance we use the global configuration command ‘router eigrp autonomous-system’ command to identify ASN and initialize the EIGRP process.

Step 2: The second step is to identify the network interfaces with the help of the command ‘network ip-address[mask]

  1. EIGRP Named Configuration:

When network engineers faced problems regarding scattered configurations and unclear scope of commands, to solve it the EIGRP named mode was introduced. The named mode provided benefits such as having all the eigrp configurations in one place, supporting multiple address families (including Virtual Routing and Forwarding –VRF instances), a clear scope of commands, and such.

The named mode stores setting in three subsections which are:

  1. Address family: This submode contains settings such selected network interfaces, logging settings, stub settings, and EIGRP K values that are relevant to the global EIGRP.
  2. Interface: This submode contains settings such as hello advertisement interval, authentication, summary of route advertisement and split horizon. In cases when there is a conflict between the explicit and default interface regarding the settings, the explicit interface takes the priority.
  3. Topology: This contains information regarding the eigrp topology database, route distribution and administrative distance settings.

The process to enable the EIGRP interfaces on a specific instance:

Step 1: By using the command router eigrp process-name you can initialize the EIGRP process.

Step 2: Initialize the EIGRP instance for the specified address family by the help of the command address-family {IPV4 | IPV6} {unicast | vrf vrf-nameautonomous-system as-number.

Step 3: Initialize the EIGRP on interfaces by using the help of the command network network mask

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