=== EIGRP:Basic configuration ===

  * Technology: Routing
  * Area: IGP
  * Vendor: Cisco
  * Software: 12.X , 15.X, IP Base, IP Services
  * Platform: Catalyst 3560, 3750, 3850, 4500, 6500, ISR Routers

**EIGRP** (Enhanced Interior Gateway Routing Protocol) is an enhanced distance vector protocol that uses Diffusing Update Algorithm (DUAL) for shortest path calculation. Basic configuration enables EIGRP routing process and tells EIGRP which interfaces to include in routing process locally.


https://networklessons.com/eigrp/basic-eigrp-configuration


**Redistribution between EIGRP and OSPF**

**Introduction**

The use of a routing protocol to advertise routes that are learned by some other means, such as by another routing protocol, static routes, or directly connected routes, is called redistribution. While running a single routing protocol throughout your entire IP internetwork is desirable, multi-protocol routing is common for a number of reasons, such as company mergers, multiple departments managed by multiple network administrators, and multi-vendor environments. Running different routing protocols is often part of a network design. In any case, having a multiple protocol environment makes redistribution a necessity.

Differences in routing protocol characteristics, such as metrics, administrative distance, classful and classless capabilities can effect redistribution. Consideration must be given to these differences for redistribution to succeed.

https://networklessons.com/cisco/ccie-enterprise-infrastructure/redistribution-between-eigrp-and-ospf