Arista EOS
The OS behind some of the world's largest, fastest data centre networks
What it is
About Arista EOS
Arista EOS (Extensible Operating System) is a Linux-based network operating system known for its programmability, stability and API-driven automation (via eAPI), widely deployed in cloud and large enterprise data centres. Network engineers configure routing protocols (BGP, OSPF), VLANs and automation scripts on EOS much as they would on Cisco IOS or Juniper Junos, making it a common third major NOS skill alongside those two.
What you can do with it
Capabilities
Configure and troubleshoot BGP/OSPF routing on Arista switches
Automate network configuration via EOS's eAPI and native Linux shell access
Manage VLANs, VXLAN overlays and data centre fabric designs (e.g. spine-leaf)
Integrate EOS devices with network automation tools like Ansible
Monitor and troubleshoot using EOS's built-in CLI and telemetry features
How to learn it
Learning Resources
Arista's free vEOS-lab virtual appliance for hands-on practice in a home lab (e.g. via EVE-NG or GNS3)
Arista's official ATD (Arista Technical Day) resources and Arista University training
Arista Certified Engineer (ACE) certification path
General networking certifications (CCNA-level) as a foundation, since routing/switching concepts transfer directly
Pro Tip
Because EOS runs on a genuine underlying Linux kernel, you can drop into bash directly from the CLI (`bash` command) — useful for scripting and troubleshooting in ways that aren't possible on more closed network OSes
Skills that use this tool
Roles that use this tool