Juniper EX4300 Series

In EX4300-48MP and EX4300-48MP-S switches, you can use only the built-in QSFP+ ports as VCPs.
You cannot congure the ports on the uplink module in EX4300-48MP and EX4300-48MP-S
switches to Virtual Chassis ports (VCPs).
• On QFX3500 and QFX3600, all non-channelized QSFP+ and xed SFP+ interfaces.
BEST PRACTICE: Use the 40-Gigabit QSFP+ interfaces for the VCPs.
The advantages of connecng mulple switches into a Virtual Chassis include beer-managed
bandwidth at a network layer, simplied conguraon and maintenance because mulple devices can be
managed as a single device, increased fault tolerance and high availability (HA) because a Virtual Chassis
can remain acve and network trac can be redirected to other member switches when a single
member switch fails, and a aer, simplied Layer 2 network topology that minimizes or eliminates the
need for loop prevenon protocols such as Spanning Tree Protocol (STP).
You can increase VCP bandwidth between member switches by conguring mulple interfaces between
the same two switches into VCPs. When mulple VCPs are interconnecng the same two member
switches, a Link Aggregaon Group (LAG) bundle is automacally formed when the VCPs are on
interfaces supporng idencal speeds. For instance, if you have two 40-Gigabit QSFP+ interfaces
congured as VCPs between member switches, a LAG with two member links with 80 Gbps of total
bandwidth is formed. 10-Gigabit SFP+ and 40-Gigabit QSFP+ interfaces congured as VCPs cannot be
members of the same LAG, however. The Virtual Chassis feature is not applicable to QFX devices in a
QFabric.
Virtual Chassis can be installed in a single rack, mulple racks, or in wire closets.
Valid Conguraons
Valid conguraons are:
• All QFX5100 members–in a ring topology this is Virtual Chassis; in a spine and leaf topology this is a
Virtual Chassis Fabric (VCF). For a cabling example of spine and leaf, see Connecng a QFX5100
Device in a Virtual Chassis Fabric.
• All QFX3600 members
• All QFX3500 members
• A mixture of QFX3600 and QFX3500 members
• A mixture of QFX5100, QFX3600, and QFX3500 members–use the QFX5100 switches as primary
and backup whenever possible.
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