Juniper QFabric QFX3008-I, Manual, Page: 40 / 472

connect to external networks. A pair of redundant Routing Engine instances are
generated for every network Node group in the QFabric system.
Related
Documentation
Understanding the Director Group on page 11
•
•
Understanding the QFabric Switch Control Plane
•
Understanding the QFabric System Hardware Architecture on page 7
Understanding Interconnect Devices
Interconnect devices in a QFabric system provide a way for the Node devices to connect
with one another over a high-speed backplane. By understanding the role of Interconnect
devices, you can harness the benefits of low latency, superb scalability, and minimum
packet processing offered by a single-tier data center architecture.
This topic covers:
• Interconnect Device Introduction on page 14
• QFX3008-I Interconnect Devices on page 15
Interconnect Device Introduction
Interconnect devices act as the primary fabric for data plane traffic traversing the QFabric
system between Node devices. The main task for the Interconnect devices is to transfer
traffic between the Node devices as quickly as possible across a high-speed, available
path backplane. To reduce latency to a minimum, the Interconnect device implements
multistage Clos switching to provide nonblocking connections between any of the Node
devices in the system.
Figure 5 on page 15 shows an example of how Clos switching
works in an Interconnect device.
Copyright © 2012, Juniper Networks, Inc. 14
QFX3000 Hardware Documentation