Not all physical QFX features (like certain hardware-based VXLAN/EVPN functions) work perfectly in the virtual RE, though version 20.2 has excellent support for modern protocols.
: Ensures raw, fast, unbuffered disk I/O. Common Troubleshooting Scenarios
+--------------------------------------------+ | Management Network | +----------------------++--------------------+ || +-----------------------++-----------------------+ | | +-----+--------------------+ +-------------+------------+ | Routing Engine (RE) | | Forwarding Engine (VFE) | | vqfx202r110reqemuqcow2 | | (Cosim / PFE Image) | | | | | | +--------------------+ | | +--------------------+ | | | Junos CLI | | | | Packet Forwarding| | | +--------------------+ | | +--------------------+ | | | Routing Protocols | | | | Line-Rate Switching| | | +--------------------+ | | +--------------------+ | +---------+----------------+ +--------------+-----------+ | | +--------------[ Internal Bridge ]------------+ (em1 <--------> eth1) vqfx202r110reqemuqcow2 exclusive
Understanding the explicit hardware and image properties ensures optimal virtualization performance under QEMU: download for vQFX 20.2 is actually 19.4 | Data Center
By mastering the vQFX, you unlock the ability to build sophisticated, production-representative data center labs entirely in software. Whether your goal is to pass the JNCIE-DC, validate the next EVPN-VXLAN design, or hone your network automation skills, the vQFX is an exclusive and unparalleled platform for innovation. Not all physical QFX features (like certain hardware-based
Unlike monolithic virtual machines, the Juniper vQFX functions as a split architecture. Emulating a physical QFX10000 chassis requires deploying two separate virtual machines bound together by an internal link.
The RE communicates with the VFE via a dedicated, isolated internal network interface (typically mapped to em1 on the RE and eth1 on the VFE). Whether your goal is to pass the JNCIE-DC,
: A companion image (often named cosim.qcow2 ) that emulates the hardware switching ASICs and handles actual data forwarding.
# Check if file is locked by QEMU lsof | grep vqfx202r110reqemuqcow2