Basic Understanding of EtherChannel

Let’s start the New Year with understanding EtherChannel which is having more than one link connected to a server, switch, or router and treating it like one logical link. This is a fault-tolerant technique that is becoming a common setup in highly available, core devices. Cisco has come up with their own proprietary version call EtherChannel. The open standard that IEEE approved is 802.3ad which works with other venders and is often called LAG for short. Continue reading

Store-and-Forward vs. Cut-Through Switching

Switching in the network can happen in two ways, these layer-two devices send frames but they can forward them in different ways. These different modes have positive and negative effects which depend on the type of network environment that runs through them! Continue reading

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 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 Beginnings of Layer Two Redundancy

In a perfect world we would never need redundancy on a network infrastructure, but as you know as well as I know we don’t live in a perfect world. Hardware will eventually fail, bottlenecks will appear, and the speed of our network will become slower when we max the bandwidth on links. So having redundancy in routers, connections, and having a hierarchy network is one of best choices to make when improving the efficiently of the network. But in the OSI model there is one layer that can’t have redundancy at least logically and that is Layer two of the OSI model. Continue reading