Virtual Chassis And Virtual Chassis Fabric - Juniper QFX5110 Series Hardware Documentation

Default mode
All 24 QSFP+ ports on the switch (PIC 0) are channelized by default (96 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. Ports are over-subscribed In this mode and could be subject to packet-loss. You
can have one of two port combinations: 32 40-Gbps QSFP+ ports, or 96 10-Gigabit Ethernet ports plus
8 40-Gbps QSFP+ ports.
104 port mode
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. 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.

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 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 primary, backup, or line card role. When mixed with QFX3500 or QFX3600
devices, configure the QFX5100-24Q device in the primary and backup roles. See
and EX Series Switches in a QFX Virtual Chassis" on page 319
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
"Connecting QFX Series
for cabling diagrams. The Virtual Chassis
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