Oh…Spanning Tree

black and white cold fog forestIt’s the “S” word we don’t like to hear, and often times it has degraded networks or even took them down entirely.  (All Systems Down – an older but classic story) It’s also one of those things that nobody really likes, we even had network companies, as well as IEEE try to replace it with something else. Remember the names like TRILL, and IEEE 802.1aq (SPB) or Cisco’s FabicPath technologies? You had all of these different flavors that showed a lot progress, but they never really took off for one reason or another. The funny part is this protocol we are all trying kill off is still alive and doing well, so let’s look at spanning tree in the meantime because you will likely run into it.

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640-911 (Chapter 12 & 13)

We are at the last chapters of the CCNA Data Center 640-911 by Todd Lammle. Chapter 12 talks about redundant switched technologies and chapter 13 talks about security. Just like before I will go over the high-points, so let’s get started! Continue reading “640-911 (Chapter 12 & 13)”

The “Ending” of Layer Two Redundancy

Although layer two redundancy should never end, this is the final chapter of understanding layer two redundancy in the network. Last week I talked about how and why STP (IEEE 802.1D) is important in the network and the problems and causes of not having it which can turn your network against you and everybody on it. Today’s post will talk about how a switch decides which one is in charge on the network and which ones aren’t Continue reading “The “Ending” of Layer Two Redundancy”

The Middle of Layer Two Redundancy

In the month of August I talked about the “beginnings” of layer two redundancy mainly looking at the basic foundations and fundamentals of having layer two redundancy. Let’s continue are discussion about redundancy in the layer two environment. Continue reading “The Middle of Layer Two Redundancy”