Data Center Architecture

Hi! Here we are with a new post.

Today we are going to talk about the "Data Center Architecture". The first thing that we have to have keep in mind is that we need equipment that run with VXLAN.
VXLAN it is a system that encapsulates the layer 2 traffic under a IP network from one physical network to another, doing that this hosts can communicate each other simulating that they are in the same physical network but they are not.
This network that is using VXLAN, send the packets to the VTEP and this is in charge of send this packet to the hosts that are in the same VXLAN segment, in this way only sends the information to the same VXLAN segment.
We once know that we need equipment with this system (VXLAN) we need to select the Arista Networks equipment, and how we can see there are specified equipment with this functionality and will select one of this to design the network.

As we explain in the previous post, we are going to design the network in tier 4 type. Then we need to design the network to have redundant links between devices.
In this way, the Arista 7504E/7508E are a device that supports VXLAN and ECMP (ECMP permits to do a load balancing of the traffic between links. This in particular is a device that permit to use links of 40G and links of 10G. This permits to change the configuration to change the speed of the links when necessary.
An example of architecture of our network design would be this:

The reason why we have selected this architecture, how we have talk about this previously, is about the tier that we want to use (TIER 4) that tell us that the network has to be redundant. In this way we have selected this architecture and this device for the advantage of being able to choose the speed that we need in our network.