The Connectivity Transformation Blog

Arista Tips & Tricks: Connecting to Arista switches via SSH Key Based Authentication

Using SSH key based authentication for managing Arista switches can be useful for the purposes of better security, automation and not having to remember passwords. In this blog post, we’ll go through an example on how to set SSH key based authentication with Arista switches. These instructions should cover any MacOS or Linux variant operating system. Windows works as well but I don’t use it so you would be on your own to configure Windows on the client side. The switch configuration would be the same for any operating system you choose.
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Three Features in Arista EOS That You Need to Know About

It’s no secret that we at WAN Dynamics are big fans of Arista switches. There is a definite feeling when using them that the Arista Extensible Operating System (EOS) was written by engineers for engineers in order to make the network operator’s life easier. In this post, we will discuss three features that are great on their own, however when coupled together, you get an amazing amount of flexibility to solve real world problems. The sum of these features is greater than each of their parts.
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Changes to VXLAN in Arista EOS

WAN Dynamics received a message from a customer late one evening that no network services company wants to get: “We performed a code upgrade and broke connectivity to our disaster recovery site”. This customer had a datacenter interconnect (DCI) with BGP routing and VXLAN between the datacenters but after the EOS upgrade there was reachability issues between them. I jumped in to assist and at first glance, things looked good. The switch interfaces and BGP sessions were up and there was full connectivity from VTEP to VTEP in the datacenter interconnect. That said, MAC addresses were not being learned across VXLAN. Hmmm, wonder why that would be? I decided to check the switch logs for any potential clues as to what could be happening. Aha! in the log buffer there are messages about VXLAN being disabled:
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Fortinet FortiGate HA Pair Mystery

Recently while setting up a new Fortinet FortiGate firewall High Availability (HA) pair, I ran into an issue that I hadn’t encountered before. The goal was to set up an active/standby HA pair and having done this many times, didn’t think much of it when configuring the normal HA settings...
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EOS Upgrade With Ansible

Even though managing Arista switches is pretty great, sometimes performing things like software upgrades can be tedious and boring, especially when there are a lot of switches to upgrade at a time. Here at WAN Dynamics, we like to solve tedious problems with automation so to for this particular challenge.
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Dual Datacenter DMZ With VXLAN, VARP, VRF & OSPF with Arista Networks

WAN Dynamics Senior Network Engineer Kevin Giusti explains the dual datacenter DMZ configuration with VXLAN, VARP, VRF & OSPF.
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8 Lessons Learned - Arista Datacenter Interconnect (DCI) with VXLAN and vARP

Though our name would imply we only work with wide area networks, WAN Dynamics has been working on some very interesting (and fun!) datacenter deployments as well, using primarily Arista Networks gear. First thing to note: this kit and company are fantastic. We genuinely enjoy working with Arista hardware, software and most of all, their people.
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