Juniper QFX3500 - Cabling QFX3500 Switches in a QFX5100 Virtual Chassis

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All QFX5100 members–in a ring topology this is Virtual Chassis; in a spine and leaf
topology this is a Virtual Chassis Fabric (VCF). For a cabling example of spine and leaf,
see Connecting a QFX5100 Device in a Virtual Chassis Fabric.
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All QFX3600 members
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All QFX3500 members
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A mixture of QFX3600 and QFX3500 members
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A mixture of QFX5100, QFX3600, and QFX3500members–use the QFX5100 switches
as master and backup whenever possible.
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A mixture of QFX5100, QFX3600,QFX3500, and EX4300 members. EX4300 switches
as the master or backup is not supported; use QFX5100 switches in these roles
whenever possible.
An all EX4300 member is simply considered an EX4300 Virtual Chassis. See
Understanding EX4300 Virtual Chassis.
If the QSFP+ interfaces are not available for VCP, 10-Gigbit interfaces can be used.
All members of the Virtual Chassis are required to run the same Junos OS Release. You
can check the version and release by issuing the show chassis version CLI command.
Cabling QFX3500 Switches in a QFX5100 Virtual Chassis
Figure 43 on page 98 is the preferred cabling method using the 40-Gigabit QSFP ports.
See Figure 44 on page 99 for an alternative method using the 10-Gigabit SFP+ ports.
97Copyright © 2017, Juniper Networks, Inc.
Chapter 11: Connecting the Device to the Network