Juniper EX4300 Hardware Manual page 210

EX4300 Switch Hardware Guide
188
EX4600 (leaf)
EX4300 (leaf)
Although best practice is to use all QFX5100 switches in the VCF, you can use EX4300
switches as leaf devices.
Installations with QFX3600, QFX3500, and EX4300 as leaf devices in the VCF are called
mixed mode. Mixed mode VCF installations can support 32 total devices, of which 4
devices can be configured into the spine devices.
You can install a VCF in a single rack, multiple racks, or in wire closets. You construct a
VCF by configuring and then cabling QSFP+ interfaces into Virtual Chassis ports (VCPs).
On EX4300 switches, QSFP+ ports 0 and 1 are configured as VCP by default.
Non-channelized QSFP+ interfaces on EX4300 switches can be configured into VCPs.
All fixed SFP+ interfaces on EX4300 switches can also be configured into VCPs.
BEST PRACTICE:
Figure 59 on page 189 shows two QFX5100-24Q spine devices connected to a
QFX5100-48S, QFX3600, QFX3500, and EX4300 leaf devices using all QSFP+ ports as
VCPs. A VCF with more than one model in the design is called mixed-mode.
Use 40-Gigabit QSFP+ ports as VCPs when available.
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