•
QFX5110 switches or a combination of QFX5110 switches and QFX5100 switches (a
non-mixed Virtual Chassis)
•
QFX5100 switches (a non-mixed Virtual Chassis)
•
QFX5100 switches with any combination of QFX3500, QFX3600, or EX4300 switches
(a mixed mode Virtual Chassis)
•
QFX3500 switches, or QFX3600 swtiches, or any combination of QFX3500 switches
and QFX3600 switches (a non-mixed Virtual Chassis)
•
Any combination of QFX3500 and QFX3600 switches with EX4300 switches (a mixed
mode Virtual Chassis)
NOTE: In Junos OS release 13.2X51-D20, you can interconnect only up to four
QFX5100-96S switches in a non-mixed QFX5100 Virtual Chassis. Starting
in Junos OS release 13.2X51-D25, you can configure up to ten QFX5100-96S
switches into a mixed or non-mixed QFX5100 Virtual Chassis.
Master Routing Engine Role
In a Virtual Chassis, each member switch is assigned one of two roles: Routing Engine or
linecard, and for Routing Engine role, receives a further designation as the master or
backup Routing Engine.
Themember that functions as the masterin the Routing Engine role in the Virtual Chassis:
•
Manages the member switches.
•
Runs Junos OS for the switches as a master Routing Engine.
•
Runs the chassis management processes and control protocols.
•
Represents all the member switches interconnected within the Virtual Chassis
configuration. (The hostname and other properties that you assign to this switch during
setup apply to all members of the Virtual Chassis configuration.)
In a preprovisioned configuration, one of the two members assigned as routing-engine
functions as the master member. The selection of which member assigned as
routing-engine functions as master and which as backup is determined by the software
based on the master election algorithm. See Understanding How the Master in a Virtual
Chassis Is Elected.
In a configuration that is not preprovisioned, the selection of the master and backup is
determined by the mastership priority value and secondary factors in the master election
algorithm.
All switches that are not assigned the master or backup Routing Engine role function in
the linecard role.
In a QFX5110 Virtual Chassis with QFX5110 and QFX5100 switches, we recommend
configuring only QFX5110 switches into the Routing Engine role.
13Copyright © 2017, Juniper Networks, Inc.
Chapter 1: System Overview
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