Planning a Virtual Chassis Deployment using QFX Devices
You can deploy QFX Series switches as members in three types of Virtual Chassis:
QFX Virtual Chassis (QFX3500, QFX3600, QFX5100, and EX4300)
QFX5110 Virtual Chassis (QFX5110 and QFX5100)
QFX5200 Virtual Chassis (QFX5200-32C only)
QFX Virtual Chassis and QFX5110 Virtual Chassis allow you to interconnect a mixture of up to ten switches into one logical device and manage the device as a single chassis. QFX5200 Virtual Chassis is limited to three QFX5200-32C members.
A Virtual Chassis configuration has two Routing Engines—the master switch and the backup switch. All other participating switches operate as line cards. You create a Virtual Chassis by cabling the switches in a ring topology and configuring SFP+, QSFP+, or QSFP28 interfaces into Virtual Chassis ports (VCPs). VCPs are responsible for passing all data and control traffic between member switches in the Virtual Chassis. Beginning with Junos OS Release 17.3R2, all non-channelized QSFP28 or QSFP+ uplink interfaces on the switches can be configured into either 40GbE or 100 GbE VCPs. All fixed SFP+ interfaces can also be configured into VCPs.
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.
This topic covers:
Valid Configurations for a QFX Virtual Chassis
Valid configurations are:
All QFX5100 members (homogenous)–Supported QFX5100 models are:
All QFX3600 members (homogenous)
All QFX3500 members (homogenous)
A mixture of QFX3600 and QFX3500 members (heterogeneous)
A mixture of QFX5100, QFX3600, and QFX3500 members (heterogeneous)–use the QFX5100 switches as master RE and backup RE whenever possible.
A mixture of QFX5100, QFX3600, QFX3500, and EX4300 members (heterogeneous). EX4300 switches as the master RE or backup RE is not supported; use QFX5100 switches in these roles whenever possible.
An all EX4300 member is simply considered an EX4300 Virtual Chassis. See Virtual Chassis Overview for Switches.
If the QSFP+ interfaces are not available for VCP, 10-Gigbit interfaces can be used.
Valid Configurations for a QFX5110 Virtual Chassis
Valid configurations are:
All QFX5110 members (homogenous)–Supported QFX5110 models are:
A mixture of QFX5110 and QFX5100 members (homogenous)–use the QFX5110 models as the master RE and backup RE. Use the following QFX5100 switches in the line card role:
Valid Configurations for a QFX5200 Virtual Chassis
You can create an all QFX5200-32C Virtual Chassis with up to three members. Use the QFX5200-32C in all three member roles: master RE, backup RE, and line card. Configure the Virtual Chassis Ports (VCPs) as 40-Gigabit Ethernet only. QFX5200-48Y is not supported in a QFX5200 Virtual Chassis.
VC Deployment Checklist
Use Table 1 to plan your deployment:
Table 1: Deployment Checklist
Item or Task
For More Information
Determine the number of devices in the Virtual Chassis and the role of each device (master RE, backup RE, or linecard).
Note: A Virtual Chassis is not constrained to a single building; the limits for the optic cable are the only consideration.
Evaluate the provisioning options and determine the configuration method that applies to your deployment.
Measure the distance between external power sources and switch installation site.
Calculate the power consumption and requirements.
|Rack or Cabinet|
Verify that your rack or cabinet meets the minimum requirements for the installation of the switch.
Plan rack or cabinet location, including required space clearances.
Secure the rack or cabinet to the floor and building structure.
Acquire cables and connectors:
Plan the cable routing and management.