DWDM and VXLAN Inter-DC Design Considerations
Utilizing Dense Wavelength Division Multiplexing (DWDM) Point-to-Point links for data center interconnectivity can ensure high-speed and low-latency connections due to its operation at the physical layer, providing a protocol-agnostic transport method.
For multicast traffic, using Layer 2 Virtual Network Identifier (VNI) over static ingress replication may not be the most efficient choice since it redundantly sends traffic copies to each VTEP configured with that VNI, potentially leading to scalability issues as the network grows.
Implementing Border Gateway Protocol (BGP) for control-plane traffic is advisable, as BGP is a robust and scalable protocol capable of handling a large number of routes and supporting policy-based routing. Additionally, forming VTEP (VXLAN Tunnel Endpoint) peering for data-plane traffic using L2VPN allows for an effective separation of the physical underlay network from the virtual overlay network, enhancing flexibility and simplifying architecture.
While this network design can offer a robust, scalable, and flexible inter-DC solution, it's important to tailor it to the unique needs of each network. Thorough testing in a lab environment is essential before moving to a production deployment to ensure compatibility and performance alignment with specific network requirements.