Whenever I’m running an SDDC workshop or doing on-site SDN/SDDC-related consulting, the question of hardware gateways between overlay virtual networks and physical world inevitably pops up.
My usual answer: You have to understand (A) what type of gateway you need, (B) what performance you need and (C) what form factor will give you that performance. For more details, watch the Hardware Gateways video from Scaling Overlay Virtual Networks webinar
80% of your job in networking is getting you and your co-worker to agree to what the terms mean.
That paraphrase comes from one of my three networking profs in college, from literally 30 years ago. But that statement is still true today. Getting to a shared understanding of what we mean helps in any conversation about networking, and failing to truly understand the terminology can cause problems.
SDN promises many things, but it certainly has a big impact on networking terminology. SDN introduces many new terms, but it also redefines some terms and reemphasizes the underlying concepts behind other long-used terms.
And then there are no terminology police to run around and make us all use terms the same way. It’s enough to drive you crazy!
Today’s post (and possibly a few more) explores some attempts to answer some of the questions about what SDN terms to use and what they mean. In this post, I’ll look at a relatively new Internet RFC: the SDN Layers and Architecture Terminology RFC.
What’s a network? Is it a class A, B, or C network, as defined by IPv4? Any subset of an IPv4 class A, Continue reading
There are 8 basic networking questions below. Although this post is related with networking basics, you can click here to solve advanced networking tests. If you are interested in more basic networking questions, you should click here How was it ? Leave your comment in the comment box.
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The importance of using templates with Cisco UCS cannot be emphasized enough. Creating something that you can reuse over and over again, as well as update and push out to pre-created objects, can save you a ton of time from an administrative perspective. vNIC and vHBA templates are a great example of this within Cisco UCSM. These templates allow you to create reusable vNIC and vHBA objects that you can reference within the creation of a service-profile template or even a LAN/SAN connectivity policy.
You can reach even further with policies and template on UCS, and create what are known as LAN and SAN connectivity policies. These will allow us to pre-create the LAN and SAN connections for service profiles and service profile templates. Take this for example. Say we knew that we were going to deploy a lot of ESXi servers in our environment, and that they would all essentially have the same exact LAN requirements in terms of the number of NICs that they needed, and the VLANs that they would need for the hosts themselves, as well as the guest machines. We could create a connectivity policy for these servers, and reuse that policy in all of Continue reading