Doing Infrastucture-as-Code (IaC) with Ansible has given me a headache – so I’ve recently been playing around with Terraform as an alternative to Ansible for certain tasks that require Cloud IaaS interactions. The goal of this blog post is to build an HA-VPN solution between GCP and an on-premises Cisco IOS-XE device (CSR) using Terraform. […]
Ansible, Nornir, and other automation frameworks are excellent for generating and deploying configurations in an automated fashion. In Ansible, you can run a playbook, loop through hosts in your inventory file, and deploy configurations with host-specific information by leveraging host_vars and group_vars. Unfortunately, as your automation environment starts to grow and become more critical, you’ll […]
We often compare ourselves to others around us. We are impressed with the skills others possess, the content others produce, the appearances others maintain, the successes others have achieved, the feats others have conquered. This constant comparison can lead to melancholic states of ambivalence, and sometimes depression due to the artificial expectations of who we […]
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Architecting for the cloud is becoming a highly desired skill set. Working as a consultant, I’m often in situations where clients are overwhelmed with questions about the cloud. How do I migrate my applications? How do I secure everything? How does it integrate with LDAP and DNS? What’s the best way to connect to the […]
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In the previous two blog posts, I covered the concepts of EVPN and shared a detailed configuration example on Arista EOS. In this blog post, I’ll be covering how to automate the deployment of EVPN in a lab environment. After deployment, I want to run validations to make sure my intent is being met. Lastly, […]
This is a follow-up to my previous article, Arista BGP EVPN Overiew and Concepts. In the previous article, I discussed some terminologies and behavior of EVPN and the reason why EVPN is valuable in Data Center and Campus networks. Since then, I’ve learned how valuable it is in Service Provider networks as well, but I’ll […]
Introduction Traditionally, Data Centers used lots of Layer 2 links that spanned entire racks, rows, cages, floors, for as far as the eye could see. These large L2 domains were not ideal for a data center, due to the slow convergence, unnecessary broadcasts, and difficulty in administering. To optimize the data center network, we needed […]
TREZOR is a hard wallet for securely storing crypto assets such as Bitcoin, Ethereum, and Litecoin. Protection mechanisms like a mnemonic recovery seed, PIN, and encryption passphrase safeguard your assets (private keys) by requiring your physical interaction in order to make transactions. For those crypto noobies, I think it’s easiest to describe the TREZOR functionality […]
A colleague recently asked me if SD-WAN could be leveraged to expedite network integration as a result of a merger or acquisition. His thoughts were that this could potentially provide a means to securely integration networks in a short amount of time. At first I thought this made no sense — SD-WAN is not related to this challenge […]
I recently ran into a slight bump when deploying the Cisco Cloud Services Router 1000v (CSR) on ESXi vSphere 6.5. The error message I received when trying to deploy the CSR OVA was: VALUE_ILLEGAL: Value “VMXNET3 virtio” of ResourceSubType element not found in [E1000, VmxNet2, VmxNet3]. I Googled this message and found nothing. Great, well […]
It’s official – I passed the ONF Certified SDN Associate exam. I’m OCSA #SDN10356! If you’re interested in obtaining this certificate, I recommend you read through my short blog series covering the resources necessary on the blueprint. ONF Certified SDN Associate (OCSA) – Part 1 ONF Certified SDN Associate (OCSA) – Part 2 ONF Certified […]
The OCSA exam tests your understanding of components in an SDN framework, your ability to articulate the fundamental workings of networking and the OpenFlow protocol, as well as your knowledge of vendors, solutions and projects available in the SDN landscape. This is the last part in a series of posts that review the blueprint for […]