Uploaded February 2026 | Updated September 2026, 3 weeks ago
Abstract
This presentation explores EVPN multi-site deployment leveraging Border Gateway nodes to interconnect heterogeneous underlay fabrics (IPv4 WAN and IPv6 DC) using VXLAN overlays. We demonstrate how dual-loopback architecture with strategic underlay connectivity ensures EVPN control plane stability during fabric isolation events, eliminating MAC churn and maintaining host reachability. The architecture implements EVPN multi-homing with DF/NDF election and local-bias BUM forwarding rules to prevent L2 loops while supporting both single-homed and dual-homed host connectivity. We discuss critical design considerations including underlay eBGP routing, VTEP loopback placement, and route target management for seamless cross-domain communication.
Patrice Brissette:
Patrice is the Lead Architect of EVPN & Network Fabric Technologies at Cisco Systems, with a primary focus on the Web portfolio. He has also expanded his expertise into the architecture and development of SONiC, with a strong emphasis on AI/ML and data center use cases. In addition, he serves as Chair of the SONiC Routing Workgroup.
With over 25 years of R&D experience in the telecommunications industry, Patrice has held diverse roles including ASIC designer, micro-coder, and software engineer. He currently leads architectural initiatives and collaborates with hyperscale customers and cross-functional teams to drive the development of strategic networking solutions.
A regular contributor to the IETF and other standards organizations, Patrice brings a depth of technical insight and a strong commitment to advancing the state of the industry through both innovation and standardization.
nanog.org/events/nanog-96/content/5646
Abstract
This presentation explores EVPN multi-site deployment leveraging Border Gateway nodes to interconnect heterogeneous underlay fabrics (IPv4 WAN and IPv6 DC) using VXLAN overlays. We demonstrate how dual-loopback architecture with strategic underlay connectivity ensures EVPN control plane stability during fabric isolation events, eliminating MAC churn and maintaining host reachability. The architecture implements EVPN multi-homing with DF/NDF election and local-bias BUM forwarding rules to prevent L2 loops while supporting both single-homed and dual-homed host connectivity. We discuss critical design considerations including underlay eBGP routing, VTEP loopback placement, and route target management for seamless cross-domain communication.
Patrice Brissette:
Patrice is the Lead Architect of EVPN & Network Fabric Technologies at Cisco Systems, with a primary focus on the Web portfolio. He has also expanded his expertise into the architecture and development of SONiC, with a strong emphasis on AI/ML and data center use cases. In addition, he serves as Chair of the SONiC Routing Workgroup.
With over 25 years of R&D experience in the telecommunications industry, Patrice has held diverse roles including ASIC designer, micro-coder, and software engineer. He currently leads architectural initiatives and collaborates with hyperscale customers and cross-functional teams to drive the development of strategic networking solutions.
A regular contributor to the IETF and other standards organizations, Patrice brings a depth of technical insight and a strong commitment to advancing the state of the industry through both innovation and standardization.
nanog.org/events/nanog-96/content/5646
