• Author : Chris Kane


Pause – Revisit the Fundamentals – Rehearse, Rehearse, Rehearse

Why? I’d like to think of this as a chapter in the manual of “CoNE.” Code of Network Ethics. OK, so I made that up. But it should be a thing, right? How many outages have you experienced where the original problem wasn’t nearly as impactful as the attempted fix? We have all experienced maintenance windows where we tried a fall-forward approach because we didn’t want to back-out the change. And the fall- or fail-forward method cost us an extended maintenance window that bled into the production time. The impact of these errors in the care and feeding of the...
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Pause – Revisit the Fundamentals – Know Your Tools

Introduction Please. Pretty please. Pretty please with sugar on top. Do these pleas sound familiar when trying to buy tools for your network? Making a purchase for moving Production traffic is easier. You may be able to quantify how much time can be saved with the purchase of a tool for automation. Or for a tool with an integration focus. Easiest of all may be when proposing a self-service tool that unburdens the thin IT staff. How do you justify spending money on tools for a rainy day when the sun is shining and the birds are chirping? It can...
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Pause – Revisit the Fundamentals – OOB

Introduction From your manager; “We have a greenfield data center project heading our way. I need you to start working on a design for two data centers. Each data center will be 10,000 square feet in size. We’ll need full network redundancy. It needs to support virtualized compute, physical compute, IP Storage, load balancers, firewalls, an oversubscription ration of 3:1 or better, horizontal cabling based on MMF and a set of Data Center Interconnect links with Layer 2 adjacency to support VM Mobility. Oh, and I need a rough budget estimate by the end of the week.” Sound familiar? Hurry...
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Pause – Revisit the Fundamentals – ARP

Introduction Wow, networking technology really does continue to march along. If you wanted to be a lifelong learner you definitely picked a great speciality. And face it, we all know the cool kids are the Network Engineers. In this article we’re not going to take a bunch of packet captures nor analyze the outputs of a dozen ‘show’ commands. There are plenty of documents for that already. Rather, this document and the entire Pause series, looks to take a step back and feed your team’s banter about ‘What problem are we trying to solve?’ Evolving Tech New Layer 1 technologies...
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Logging – Basic Syslog and Beyond

Overview Logging is often viewed as a basic feature and a common element of all infrastructure devices. But the importance shouldn’t be overlooked. And the related configurations shouldn’t be taken for granted. Whether the purpose is for operations and troubleshooting or to meet compliance requirements, the topic of system logs including how they are configured and where that information is stored should be given more than passing consideration. In this article we’re going to look at basic configuration of Syslog along with some Arista related tips and tricks that will help with operations and compliance. Basic Syslog Beyond operational reasons, logging data is...
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Maintenance Mode Lab – Example of BGP on Spine

Maintenance Mode Introduced in Arista’s EOS 4.15.2F, Maintenance Mode is a method to allow for easy maintenance of a switch or specific elements of a switch. The goal is to provide a set of commands with a wide range of flexibility that make our network operations lives a bit simpler. And along the way try to help drive down human error. With Maintenance Mode we expect to make the removal and reintroduction of a whole switch or portions of the switch a graceful operation that minimizes network downtime. The initial introduction of Maintenance Mode was aimed at BGP, Interfaces and the Switch as...
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