VCF installations with a mixture of models are called mixed mode. For example, a mixed mode QFX5100
VCF might contain a EX4300 or QFX3600 as leaf devices. Mixed mode devices must be configured before
joining the VCF and are not eligible for the auto-provisioned configuration (plug and play). Adding a device
configured as mixed mode to a VCF can cause those devices to be marked inactive if the other devices
are not also configured as mixed mode. In both mixed mode and homogeneous configurations, you must
run the same Junos OS release on all devices. In a QFX5100 VCF, the optimum configuration comprises
only QFX5100 models. When both the QFX5100-24Q and the QFX5100-48S are available in a VCF, use
the QFX5100-24Q as the spine.
In a QFX5110 VCF, the optimum configuration comprises only QFX5110 models. When multiple models
of QFX5110 are in a VCF, use the QFX5110-32Q as the spine. All QFX5110 VCF configurations are
considered homogeneous.
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