Cisco Dynamic Routing: How Routing Protocols Work

What are Routing Protocols? How do they work?

Welcome to the Free CCNA Training Course. This series is for anyone who wants to build on their basic network skills, and even pass the CCNA 200-301 exam.

Section 2 of this series covers Layer-3/Routing. This covers topics like general routing, routing protocols, OSPF, and QoS (Quality of Service).

The website has additional links for further study to take you to the next level. Links are at the end of the description.

In this video, we’re going to cover:
0:00 Introduction
0:26 What are Routing Protocols?
4:37 Comparing Routing Protocols
10:38 Path Selection

Static routes are fine, but they’re very manual. We can make our lives easier in many cases by using dynamic routing.

When a routing protocol is used, routers ‘discover’ their neighbours (as long as they’re running the same protocol). They then form a neighbour relationship and learn about each other’s routes.

The routers share these routes with each other until all routers in the network know about all routes. This is called ‘convergence’.

Sometimes there are two or more paths to a destination. In this case, a routing protocol will use a route’s metric to decide which is best, and offer that to the routing table.

If there is more than one routing protocol running on a router, and they both offer the same route to the routing table, the router selects the best one by using the Administrative Distance (AD).

In some cases, two or more paths are perfectly even. In this case they both end up in the routing table, and the router uses both paths, allowing them to share the load.

IGPs (Interior Gateway Protocols) are RIP, EIGRP, OSPF, IS-IS, and iBGP. The only EGP (Exterior Gateway Protocol) is eBGP.

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[acctester]

Hi, when I sign up as a patreon, will I be able to create my own topology for labs? example for vxlan