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Routing

Understanding Network Routing Protocols

routing protocols

Network Routing Protocols – IGRP, EIGRP, OSPF, ISIS, BGP By Shaun Hummel   Overview of Routing Protocols The purpose of routing protocols is to learn of available routes that exist on the enterprise network, build routing tables and make routing decisions. Some of the most common routing protocols include RIP, …

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Installing GNS3 Router Simulator

gns3

GNS3 is a routing simulator and allows you to simulate Cisco routers, switches and firewalls as well as simulate Juniper routers too. In this post we are going to download and install GNS3. To begin we need to download the software – a simple Google search takes us to http://www.gns3.net/download …

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What is a Router Simulator

Router Simulators are a great way to create and test new network topologies without the expense of lots of hardware. Many people use router simulators to help them practice and study for upcoming certification tests and many people are able to pass these certifications because of the convenience of a …

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Understanding Policy Routing

Policy Routing

Learning and understanding policy routing is crucial knowledge for any good network engineer. You’ll find quite a bit of policy routing going on in today’s production networks.  But what exactly is policy-based routing? Policy routing Policy-based routing, generally referred to as “policy routing”, is the use of route maps to …

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Moving Layer 3 to the Network Edge

With the advent of new technologies as well as the ability to have multi-layer switches at the access layer, Cisco is starting to change the game.  New network designs are pushing layer 3 routing out to the access switches creating a routed edge. Most campus and data center network designs …

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Understanding Wild Card Masks

wild card masks

Many engineers (at one time myself too) believe they understand wild card masks. If you ask someone they will most likely tell you that a wild card mask is just the opposite or reverse of a subnet mask. Unfortunately this isn’t quite correct. Yes, at first glance a wild card …

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Monitoring your network for topology changes

So, Your the senior network engineer for a nice large network. Everything is running smoothly until one day a primary link goes down and you seem to be the last one to know about it!  Everyone is running to you to find out whats going on and expecting you to …

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BGP Command “no syncronization”

When you are running BGP on two or more routers that border your network to the outside world, you will need to configure iBGP between all of these BGP peer routers. Just as a quick refresher, iBGP routers are routers that are in the same AS, eBGP routers are in …

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