Virtual Chassis Fabric User Guide
Use this guide to set up and configure a Virtual Chassis Fabric (VCF), which provides a low-latency, high-performance fabric architecture composed of multiple supported combinations of QFX Series and EX Series switches (VCF members) interconnected together that operate and are managed as a single network entity. Refer to switch hardware documentation for more details on switch models and physical interconnections that can be used to form a VCF.
Also, for VCF planning and configuration best practices, see Virtual Chassis Fabric Best Practices Guide (PDF only).