EIGRP Basics

EIGRP is a Cisco proprietary protocol. If you don’t mind being locked in using a vendor specific protocol you will then enjoy using a robust, well-developed protocol that will meet most enterprise network needs. Here are a few basic bullet points about EIGPR:

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CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes Part I

CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes:

  • There is a natural need for routing protocols
    • The use of layer 3 devices
    • Scalability
      • The most common routing protocols used in an enterprise/campus networks are versions or RIP, EIGPR, OSPF
      •  Most common routing protocol used for external/untrust (Internet) networks is BGP
    • There are 3 Routing Protocol Categories
      • Distance Vector (Sends full copy of the routing table at certain interval)
        • Distance-Vectore routing protocols use one of the following approaches to prevent routing loops:
          • Split Horizon – This is when an interface is prevented to advertise a route which it already learned on that interface. 
          • Poison ReverseThis is when an interface receives a route advertisement but then re-advertises the same route out with a metric considered infinite.

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RIPv2 (Routing Information Protocol) – Basics Part 1

In order to have packets flowing through the modern network you need Physical Equipment (Layer 1), you need aggregated devices such as switches for quick transport (layer 2), and finally you need routers/layer 3 switches that can route traffic on an ip network (layer 3). Each hop or interface along a path needs to have a layer 3 ip address IPv4 or IPv6 in order for the packet to traverse the ip network. The way that all layer 3 devices make decisions to forward traffic is a routing table. The three ways a layer 3 devices learns and adds routes to its routing table are:

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