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Related Documentation

  • Virtual Chassis Fabric Overview
  • Understanding Virtual Chassis Fabric Components
  • Understanding EX4300 Virtual Chassis

Connecting EX Series Switches in a Virtual Chassis Fabric

A Juniper Networks Virtual Chassis Fabric (VCF) is constructed using a spine-and-leaf architecture and topology. In the spine-and-leaf architecture, each spine device is interconnected to each leaf device. Supported devices in a VCF are:

  • QFX5100-24Q (spine or leaf)
  • QFX5100-48S (spine or leaf)
  • QFX5100-48T (spine or leaf)
  • QFX5100-96S (spine or leaf)
  • QFX3600 (leaf)
  • QFX3500 (leaf)
  • 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: Use 40-Gigabit QSFP+ ports as VCPs when available.

Figure 60 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.

Figure 60: Mixed Mode VCF with a EX4300 Switch

Mixed Mode VCF with
a EX4300 Switch

Related Documentation

  • Virtual Chassis Fabric Overview
  • Understanding Virtual Chassis Fabric Components
  • Understanding EX4300 Virtual Chassis

Modified: 2015-06-23