Guidelines and Limitations

For most fabric designs the general recommendation is to implement a Layer 3 underlay for scalability and ease of interoperability: BGP and OSPF are solid and mature protocols that in a great number of scenarios offer the most effective way to design and run a fabric.

Whenever possible, for redundancy, scalability and optimal trunk load splitting it is recommended to allocate at least 50% extra bandwidth to VXLAN loopback trunks in excess of the peak aggregate bandwidth expected to be used by all the fabric traffic when recirculated.

These are some common limitations to consider when planning and configuring VXLAN deployments:

1. For VXLAN centralized routingdesigns up to 32 vRouters are supported (the actual maximum number is platform-dependent).
2. For Fabric VRF distributed designs the number of supported VRFs is in in the order of thousands, depending on the specific switch model’s hardware capacity.