A specific handler component is deployed for the OVN Kubernetes CNI plugin.
OVN is a project that builds on top of Open vSwitch providing a rich high level API for describing virtual network components like Logical Routers, Logical Switches, Load balancers, Logical Ports. OVN Kubernetes is a Cloud Management System Plugin (CMS plugin) in terms of the OVN project.
The OVN Kubernetes handler watches for Submariner
Endpoints and Kubernetes
Nodes and interfaces with the OVN databases (OVN NorthDB and SouthDB) to store and
maintain information necessary for Submariner, including:
A logical router named
submariner_router that handles the communication
to remote clusters and has a leg on the network which can talk to the
ovn-k8s-gw0 interface on the Gateway node. This router is pinned to
the active Gateway chassis.
Routing policies added to the existing
ovn_cluster_router which redirect
traffic targeted for remote routers through the
submariner_join logical switch that connects the
The following diagram illustrates the OVN Kubernetes handler architecture where the blue elements represent the OVN Kubernetes native network elements and the yellow elements are introduced by Submariner.