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Configuration Tips

Getting Going with Cisco Router Simulators

For anyone who has ever needed to test a new network architecture, implement a new routing protocol or simply study for a Cisco exam has needed access to a real live router or a router simulator.  But buying a bunch of routers just test up an idea or for study …

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HSRP vs VRRP: comparison of protocols

hsrp vs vrrp

When configuring high availability gateways between multiple routers you only have a couple of options to choose from. If you have all Cisco routers chances are you will be configuring and using HSRP to provide redundancy between your routers. If you have Juniper, Foundry (Brocade), or any another router you’ll …

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Any Source Multicast and Source Specific Multicast


Applications/Servers use IP multicast to send their contents in IP packets to a group of interested clients. These clients indicate their wish to receive such traffic explicitly by sending an IGMP (Internet Group Management Protocol) join message. In early years of IP multicast deployment, receivers and senders did not know …

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An Introduction to LTE


You just need to step outside to realize how much mobile phones have changed our lives. People have this need to stay connected all the time and new, faster, better performing mobiles are constantly being released. As a consequence we need to increase what we are able to do with …

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Understanding Ethernet Jumbo Frames

There seems to be a growing argument lately over network optimization and the use of Jumbo Frames.  With the cost of Gigabit networking continuing to go down, and 10 Gigabit (and greater) networks becoming more affordable, the impact of this decision is becoming more and more important. Knowing how and …

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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 …

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