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Welcome to The ASCII Construct

My name is Aninda Chatterjee and I am a network engineer. I run this site (read: blog) to share my experiences across various networking domains that I have worked in, including a wide range of technologies and solutions such as Cisco SD-Access, EVPN VXLAN data centers, network infrastructure for AI clusters.

I am a published author with Deploying Juniper Data Centers with EVPN VXLAN published in 2024 and Mastering Advanced Juniper Data Centers in 2026, available through Amazon and Pearson.

Deploying Juniper Data Centers with EVPN VXLAN Deploying Juniper Data Centers with EVPN VXLAN Buy on Pearson → Mastering Advanced Juniper Data Centers Mastering Advanced Juniper Data Centers Buy on Pearson →

  • Cisco SDA Part I — Introduction to LISP

    Kick off the Cisco SD-Access series with an introduction to LISP — the control plane at the heart of the SDA fabric — and its core terminology.

    cisco · sda · lisp

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  • Juniper Apstra Part I — Introducing a true IBNS

    An introduction to Intent-Based Networking with Juniper Apstra, exploring how it models, designs and automates data center fabric deployments.

    juniper · apstra · evpn

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  • Juniper Apstra Part II — Building a data center rack

    Start designing the building blocks for a data center deployment in Apstra, walking through rack design and logical device configuration.

    juniper · apstra · evpn

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  • Multi-vendor EVPN VXLAN with Containerlab

    Deploy a multivendor EVPN L2 overlay fabric using Containerlab for topology management and Ansible for full automation of the fabric configuration.

    evpn · vxlan · containerlab · multivendor

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  • Asymmetric routing with SR Linux

    A deep dive into asymmetric IRB on Nokia SR Linux in an EVPN VXLAN fabric, covering L2 extension and L3 services across a 3-stage Clos topology.

    nokia · srlinux · evpn · vxlan

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  • Cisco NXOS EVPN Hybrid Mode

    Pull back the curtain on NXOS EVPN Hybrid mode and understand how it enables interoperability between Symmetric and Asymmetric VTEP deployments.

    cisco · nxos · evpn · vxlan

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  • Junos Part I — The Basics

    An introductory look at Junos OS — the CLI, operational and configuration modes, and basic Layer 2 bridging on Juniper platforms.

    juniper · junos

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  • Cumulus Basics Part I — Navigating the OS

    Begin the Cumulus Linux series with an introduction to the operating system, NCLU, and the foundational concepts for open networking on Cumulus.

    cumulus

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