Routing

How To Troubleshoot Crashes on an ASR-1006 Router

how to troubleshoot a crash

When working with the Cisco ASR router platform (or any router for that matter) you may run into situations where the router had some sort of issue and crashed. I know what your thinking – “ROUTERS AREN”T SUPPOSED TO CRASH!!” This is true and they usually don’t crash. But every …

Read More »

Understanding Network Routing Protocols

routing protocols

Network Routing Protocols – IGRP, EIGRP, OSPF, ISIS, BGP 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, IGRP, EIGRP, OSPF, IS-IS …

Read More »

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 …

Read More »

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 …

Read More »

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 …

Read More »

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 …

Read More »

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 …

Read More »