January 23, 2019

OSPF LSA Types

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

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?

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

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

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

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...

EIGRP and AF-Interface

Within the realm of EIGRP, there are two different modes, classic and named. Classic is the usual version most people are used to where the protocol configuration starts with "router eigrp 123" or something...
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