The advantages of connecting multiple switches into a Virtual Chassis include
better-managed bandwidth at a networklayer, simplified configuration and maintenance
because multiple devices can be managed as a single device, increased fault tolerance
and high availability(HA) because a Virtual Chassis can remain active and network traffic
can be redirected to other member switches when a single member switch fails, and a
flatter, simplified Layer 2 network topology that minimizes or eliminates the need for
loop prevention protocols such as Spanning Tree Protocol (STP).
You set up a Virtual Chassis by configuring Virtual Chassis ports (VCPs) on the member
switches, and interconnecting the switches using the VCPs . VCPs are responsible for
passing all data and control traffic between member switches in the Virtual Chassis. The
following ports on QFX Series switches that support Virtual Chassis can be configured
into VCPs to form a QFX Series Virtual Chassis:
•
Any 100-Gbps or 40-Gbps QSFP28 ports on QFX5110 switches
•
Any non-channelized 40-Gbps QSFP+ ports on QFX3500, QFX3600, QFX5100, or
QFX5110 switches
•
Any fixed 10-Gbps SFP+ ports on QFX Series switches with these ports
See EX4300 Switches Hardware Overview for details on the ports on an EX4300 switch
that can be configured into VCPs in a QFX Series Virtual Chassis.
You can increase VCP bandwidth between member switches by configuring multiple
interfaces between the same two switches into VCPs. When multiple VCPs interconnect
the same two member switches, a Link Aggregation Group (LAG) or bundle is
automatically formed when the VCPs are on interfaces supporting identical speeds. For
example, if you have two 40-Gbps QSFP+ interfaces configured as VCPs between
member switches, a LAG with two member links with 80Gbps of total bandwidth is
formed. However, 10-Gbps SFP+ and 40-Gbps QSFP+ interfaces configured as VCPs
will not become members of the same VCP LAG.
QFX5110 Switches in a Virtual Chassis
Starting in Junos OS Release 17.3R1, Virtual Chassis is supported on QFX5110 switches.
You can interconnect up to ten QFX5110 switches or a combination of QFX5110 and
QFX5100 switches into a QFX5110 Virtual Chassis.All switches can run the same software
image, and you do not need to configure mixed mode.
The following QFX5110 and QFX5100 switches are supported in a QFX5110 Virtual Chassis:
•
QFX5110-32Q
•
QFX5110-48S
•
QFX5100-24Q
•
QFX5100-48S
•
QFX5100-96S
9Copyright © 2017, Juniper Networks, Inc.
Chapter 1: System Overview
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