With the advent of layer-3 leaf-and-spine data center fabrics, it became (almost) possible to build pure layer-3-only data center networks… if only the networking vendors would do the very last step and make every server-to-ToR interface a layer-3 interface. Cumulus decided to do just that.
Episode 38 of Software Gone Wild with Dinesh Dutt from Cumulus is a deep dive into that functionality, covering everything from the concepts to load balancing on Linux and vSphere, routing requirements of Linux hosts, IP multicast issues, history lessons learned in the times of Mobile ARP, uRPF challenges of Cumulus Linux, and even hardware offloads being planned for Linux kernel.
A few more blog posts you want to read to understand what we were talking about include:
- Introducing Redistribute Neighbor (Cumulus Networks blog)
- Redistribute Neighbor (Cumulus Networks knowledge base article)
- Re-architecting layer-3-only networks
- ARP processing in layer-3-only networks
- Reinventing CLNS with layer-3-only forwarding
- This is not the host route you’re looking for
- VRRP, Anycast, Fabrics and Optimal Forwarding
- Arista EOS VARP behind the Scenes
- Mobile ARP in Enterprise Networks
- So You Need ISSU on Your ToR Switch?
If you’re still lost after listening to the podcast and reading these blog posts (yes, it’s a heavy topic), please write a comment (or send me an email), and don’t forget to include the approximate time in the podcast where we lost you.