Juniper QFX3000-G QFabric, Deployment Manual, Page: 62 / 652

Control Plane Elements
Control traffic within a QFabric system is carried across a redundant, scalable,
out-of-band, Ethernet switching network called the
control plane network. To maintain
high availability, the QFabric system control plane is separated from the QFabric system
data plane.
Figure 11 on page 36 shows a diagram of the QFabric system devices that
compose the control plane network.
Figure 11: QFabric System Control Plane Network
Node devices
Ports 0-31
Interconnect devices
Ports 38-39
Director group
Ports 40-41
Inter-VC LAG
Ports xe-x/1/0 and xe-x/1/2
Virtual Chassis
g041136
The control plane consists of the following elements:
• Control plane switches —Provide connectivity to the management interfaces of all
QFabric system components in the control plane network, including the Node devices,
the Interconnect devices, and the Director group. When you interconnect all QFabric
system devices to the control plane switches, the Director group can manage the entire
system. Depending on the size and scale of your QFabric system, the control plane
switches might be standalone switches or might be groups of switches bundled into
a Virtual Chassis (See the Example topics in the Related Documentation section of
this topic to learn more about the control plane switch configuration required for your
QFabric system.)
For example, the control plane switch for the QFX3000-G QFabric system requires
two Virtual Chassis containing four EX4200 switch members each. The two Virtual
Chassis connect to each other across a 10-Gigabit Ethernet LAG link to provide
maximum resiliency for the QFabric system control plane.
• Connections between the management interfaces of the Node devices and the
control plane switches
—Enable control plane connectivity from the Node devices to
the rest of the QFabric system. You must connect two management interfaces from
Copyright © 2015, Juniper Networks, Inc. 36
QFX3000-G QFabric System Deployment Guide