BGP Route Reflectors

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Within BGP there are two common ways to build a BGP network. Full Mesh With a BGP Route Reflector The end goal is that each of the routers in your network has the prefixes from...

OSPF LSA Types

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OSPF is a commonly used IGP used in a wide range of enterprise environments. It uses its algorithm to determine the shortest path to the destination network address. This algorithm is based on the...

OSPF Virtual Links

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In an OSPF network, usually all areas need to be connected to the backbone area, area 0. There is a way around this though. Take a look at the topology above. Area 0 is...

#CLUS CCIE Practice Labs?

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So before leaving for #CLUS last week, a co-worked mentioned to that there were CCIE practice labs available at #CLUS. I hadn't stumbled across this before yet myself. At #CLUS in the World of...

Troubleshooting Basic BGP Path Issues

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In everything I've been working on lately, a lot of it has revolved around BGP. Most of this has come from my CCIE studies. In practice labs and scenarios something I've become accustomed to...
next-hop-self topology

When to Use BGP Next-Hop-Self

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When beginning their CCIE studies, some people, including myself, wonder exactly when the next-hop-self option of BGP should be used. For this example we will use the topology above. Routers 1 and 2 have...

Guide to DHCP Snooping

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DHCP snooping is a security feature that you will surely run into in while studying for your Cisco exams or while working in an enterprise environment perhaps. It first off helps ensure that you...