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May 19, 2012

Understanding Policy Routing

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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 determine the path a packet [...]

Moving Layer 3 to the Network Edge

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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 have been following the standard [...]

AAA Best Practices

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Authentication, Authorization, and Accounting… Otherwise Known as AAA (triple A).  Most people who have had to implement AAA on a router or switch probably know very little about the commands they copy to the router config.  Most simply grab the AAA configs from another working router or switch and be done with. But have you [...]

Understanding Wild Card Masks

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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 mask “looks” like the reverse [...]

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 is expensive.  And until recently [...]