The Gateway to the Cloud: OvS in a Layer 3 Routed Datacenter

Описание: Speakers: Carl Baldwin and Jacob Cooper, DigitalOcean
Slides: https://www.openvswitch.org/support/o...


DigitalOcean is undergoing a major overhaul of its droplet network infrastructure. Until now, public IP traffic was carried among droplets and the internet over a large flat layer 2 data center (DC) network.

While an L2 network offers full mobility of IP addresses throughout an L2 zone, it presented some pains as DigitalOcean began to scale. The sheer volume of broadcast traffic from ARP requests alone makes for a very noisy network, with every hypervisor (HV) seeing every request. Additionally, tying subnets to L2 zones created IP mobility issues between zones and, potentially, DCs.

What is the solution? We chose to move to an L3-based infrastructure. This session will show our journey from L2 to L3 in detail. It will highlight how we leveraged OvS to make this change, using parallel active data paths and pivot points to switch between them. OvS continues to be a key element in the L3 network going forward.

We will share all of the pitfalls and innovations that got us to where we are along with all that we have left to do.

Those who attend this session can expect to learn about how DO droplets reach the internet at scale.

How we are able to move droplet traffic on existing HVs from L2 to L3 without downtime using Open vSwitch.
The advantages and disadvantages of using Open vSwitch on the HVs. The challenges of retrofitting it into a routed network and how we can potentially do better. What were the alternatives?
How we built and scaled an L3 network using our existing network gear and HVs.
Our custom-built, HV-local ARP and NDP responder and BGP route announcer.