Weaving the Fabric: EVPN overlays for multi-cluster KubeVirt deployments

To address the challenge of providing seamless Layer 2 connectivity and mobility for KubeVirt virtualized applications distributed across multiple clusters (for reasons like disaster recovery, scaling, or hybrid cloud), we integrated OpenPERouter, an open-source project that provides EVPN-based VXLAN overlays, solving the critical need for distributed L2 networking.

OpenPERouter's declarative APIs and dynamic BGP-EVPN control plane enable L2 networks to stretch transparently between clusters, maintaining VM MAC/IP consistency during migrations and disaster recovery. This architecture facilitates deterministic cross-cluster live migrations, better supports legacy workloads needing broadcast/multicast, and enables migrating workloads into the KubeVirt cluster while preserving original networking using open components. Routing domains are also supported for traffic segregation and to provide direct routed ingress to VMs, eliminating the need for Kubernetes services to expose ports.

Attendees will gain the practical knowledge to design and implement resilient, operationally safe, EVPN-based overlays with OpenPERouter, receiving actionable design patterns and configuration examples.