Juniper QFabric QFX3000-G Hardware Documentation page 133

Virtual Chassis and Virtual Chassis Fabric
Port LEDs
Copyright © 2018, Juniper Networks, Inc.
additional QSFP+ ports are detected in an expansion module (PIC 2), those ports are
ignored.
Flexi-pic mode
Ports 0 through 3 of the switch cannot be channelized; ports 4 through 24 are
channelized by default (80 ports). With QFX-EM-4Q Expansion Modules (PIC 1) and
(PIC 2), the QSFP+ ports are supported for access or uplink ports, but cannot be
channelized. With EX4600-EM-8F Expansion Modules installed (PIC 1) and (PIC 2),
the 16 SFP+ ports of SFP are recognized for a total of 96 logical ports.
Non-oversubscribed mode
All 24 QSFP+ ports on the switch (PIC 0) are channelized (96 ports). Expansion
modules on PIC 1 and PIC 2 are not supported and cannot be channelized. There is no
packet loss for packets of any size in this mode.
The QFX5100-24Q device operates as a standalone switch, a member of a QFX Virtual
Chassis, or as a spine or leaf device in a QFX5100 Virtual Chassis Fabric (VCF). QFX Virtual
Chassis support up to 10 members. QFX5100 VCF supports 20 QFX5100 and EX4300
devices, of which 4 QFX5100 devices can be configured as spines.
To connect a QFX5100-24Q device as a member in a QFX Virtual Chassis, you need to
cable a pair of ports to link each member in the Virtual Chassis into a ring topology. Each
member in the ring has at least one direct Virtual Chassis port (VCP) connection to each
directly connected member. QFX5100-24Q devices are recommended in the master,
backup, or line card role. When mixed with QFX3500 or QFX3600 devices, configure the
QFX5100-24Q device in the master and backup roles. See Connecting QFX Series and EX
Series Switches in a QFX Virtual Chassis for cabling diagrams. The Virtual Chassis feature
is not applicable to QFX devices in a QFabric.
To connect a QFX5100-24Q device as a spine or leaf device in a QFX5100 VCF, you need
to cable a set of ports as VCP connections that link each spine device and leaf device.
All spine devices have at least one direct VCP connection to each leaf device in the VCF.
Non-channelized DAC cables can be configured as VCP connections. See Connecting a
QFX5100 Device in a Virtual Chassis Fabric for a cabling diagram.
BEST PRACTICE:
device. By using the QFX5100-24Q device in a maximum configuration of 20
total devices, four QFX5100-24Q devices may be used as spine devices. All
members can be connected to the spine using QSFP+ ports.
As of Junos OS release 17.3R1, you can also connect a QFX5100-24Q as a leaf device in
a QFX5110 VCF or as a member in a QFX5110 Virtual Chassis.
The bi-color LEDs labeled Link/Activity LED in
or faults.
Whenever possible use the QFX5100-24Q device as a spine
Figure 47 on page 84
Chapter 4: QFX5100 Overview
indicate link activity
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