Cloud overlay
![cloud overlay cloud overlay](https://d12swbtw719y4s.cloudfront.net/images/5RHqv9N6/n5vnPkquXVd4phV7f0qs/tejdx5T09b.png)
Exploiting the use of the internet for carrier transport is just a natural evolution then. Things have changed beyond the use of just “MPLS” for transport. While the above shows a simple example of a Layer 3 underlay. Traditional MPLS What problems underlays cannot solve? Once CE handovers traffic to PE, it forgets on how it is transported inside the Provider network and which route it takes. This is a Peer-based VPN, which means that the CE ( Customer Edge) peers with PE ( Provider Edge router), exchange routes, and then how the routes are advertised between the PE is the responsibility of the MPLS provider and not the customer who owns CE. There is a layer 3 IP/MPLS VPN between the 3 sites which is the underlay for this customer. Let’s take the example of a common physical infrastructure for example a WAN network, In which a customer has three sites A, B, C with the C as the HQ which are all physical devices. Let’s start to understand underlay before going to overlay The underlay network is the MPLS here, it can be any routing protocol in Datacenter like OSPF, BGP, etc. This blog uses the example of SD-WAN, but the concepts and advantages are exactly the same for the Datacenters, you will just replace the CE router with a virtual machine ( VM) that needs to communicate with Spine switch which is the CE a the HQ in this example. Overlays have been there for a quite while but with the SD-WAN they have become very popular. On the other hand, the overlays bring the flexibility that underlay is not able to provide. VPNs can solve these issues albeit with some inefficiencies as they are very transport medium centric and explained below. This creates the following inefficiencies and drawbacks: Network segmentation and network slicing are not possible – duplicate IP address ranges cannot traverse a single IP network natively Scaling is hard. Why overlay networks are important and worth discussing?ĭo you know that traditional routers and switches are hardware-centric and perform packet forwarding based on the destination IP address, therefore network segmentation and multi-tenancy are not possible. while an overlay is a logical network that uses network virtualization to built connectivity on top of physical infrastructure using tunneling encapsulations such as VXLAN, GRE, IPSec. I will do so using SD-WAN as a reference, but the concepts are the same in the Datacenter i.e SDN in Datacenter also uses the concept of overlays.Īn Underlay network is the physical network responsible for the delivery of packets like DWDM, L2, 元, MPLS, or internet, etc. Therefore this blog takes you step by step on the concept of underlay, its limitations, and how overlay solves it. What are the limitations in the underlays that triggered a need for the overlays? However, they are difficult to understand, and more importantly, they do not address the most important point – what problems overlays are trying to solve.
CLOUD OVERLAY FREE
If you don’t have time for that, you can always refer to the free sky collections above.The “Overlay vs underlay” discussion is important as overlays are everywhere- in the Datacenters and in SD-WAN.Īnd there are many tutorials out there explaining overlays and in particular difference between overlay and underlay. In a matter of weeks you will have a sizable collection of sky overlays. Spend several days watching the skies above your head and taking photos of the most interesting cloud patterns. With objects present you may get a shadowy background and you will need some ND filters to darken the sky. Without background objects it’s also easier to get a balanced exposure. Otherwise it will give you more work when you need to remove these objects from the image. Avoid background objects like hills, houses, trees. When you take sky photos, use these simple rules. Add sky photos for different weather and lighting conditions. You can have your own categories of skies: clean blue skies, clouds, overcast skies, golden hour skies, blue hour skies. Create your own collection of sky images by building a new habit: take photos whenever you see a particularly beautiful sky. But you don’t always need to search for and buy sky stock photos. You have access to tons of good sky photos above.
CLOUD OVERLAY HOW TO
Well, they are free, which is always pleasant! How to create sky and cloud overlays We recommend adding the above sky and cloud photos to your arsenal of creative assets. In conclusion, sky overlays are useful elements that can help fix uninteresting and bleak skies in no time.