Juniper QFX5100 Hardware Manual page 186

QFX5100 Switch Hardware Guide
166
A VCF implementation is comprised of spines and leaf devices. Supported devices in a
VCF are:
QFX5100-24Q (spine or leaf)
QFX5100-48S (spine or leaf)
QFX5100-48T (leaf)
QFX5100-96S (leaf)
QFX3600 (leaf)
QFX3500 (leaf)
EX4300 (leaf)
An all QFX5100 installation is the optimum VCF configuration. When multiple models
of the QFX5100 are in a VCF, use QFX5100-24Q, if available, as the spine. Installations
with all members within the same line of switches (for example, QFX5100-24Q,
QFX5100-48S, QFX5100-48T, and QFX5100-96S) are homogeneous configurations.
VCF installations with EX4300, QFX3500, or QFX3600 leaf members are called mixed
mode. 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.
All VCF installations can support 20 total devices, of which 4 QFX5100 devices can be
configured as spine devices.
Follow these steps to install a VCF:
Install the individual switches in a rack or cabinet following the guidelines in
1.
a Virtual Chassis Fabric Deployment" on page
BEST PRACTICE:
order of master routing engine (RE), backup RE, other QFX5100s, and then
other leaf devices.
Make a list of all of the serial numbers of the devices.
2.
Log into each device and configure into fabric mode and mixed mode, if needed. If a
3.
spine device is not properly configured in fabric and mixed mode, the VCF devices
reboot to commit the mixed mode or fabric settings. When fabric and mixed mode
are not set, you might need to manually correct any issues that are related to the VCF
not forming correctly because the device did not immediately join the VCF.
WARNING: Only configure operational-level commands. If you commit
any configuration-level commands (including assigning IP address), the
Virtual Chassis Fabric cannot form and the switch must be zeroed.
72.
Install spine devices at the top of the rack or cabinet in
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"Planning