All 24 QSFP+ ports on the switch (PIC 0) are channelized (96 ports). Two ports on
QFX-EM-4Q Expansion Module (PIC 1) are also channelized (8 additional). In this
mode, ports 0 and 2 are channelized by default and ports 1 and 3 are disabled. If
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.
•
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.
Virtual Chassis and Virtual Chassis Fabric
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 Juniper Networks Virtual Chassis Fabric (VCF).
QFX Virtual Chassis support up to 10 members. VCF supports 20 QFX5100 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 Switches
in a 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 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” on page 187 for a cabling diagram.
BEST PRACTICE: WheneverpossibleusetheQFX5100-24Qdeviceasaspine
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.
Port LEDs
The bi-color LEDs labeled Link/Activity LED in Figure 14 on page 26 indicate link activity
or faults.
25Copyright © 2016, Juniper Networks, Inc.
Chapter 2: Chassis Components and Descriptions
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