Understanding Interconnect Devices; Interconnect Device Introduction - Juniper QFabric QFX3000-G Hardware Documentation

QFX3000-G QFabric System Hardware Documentation
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Understanding Interconnect Devices

Interconnect Device Introduction

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These special-purpose external Routing Engine instances running on the Director group
provide the following major services for the QFabric system:
Fabric manager Routing Engine—Provides services to all devices in the QFabric system,
such as system initialization, topology discovery, internal IP address and ID assignment,
and interdevice communication. The fabric manager Routing Engine authenticates
Interconnect and Node devices, and maintains a database for system components. A
single fabric manager Routing Engine instance is generated to manage the entire
QFabric system.
Fabric control Routing Engine—Runs the fabric control protocol to share route
information between available devices in a partition. A pair of redundant route
distribution Routing Engine instances is generated for every partition in the QFabric
system, and both instances are active.
Diagnostic Routing Engine—Gathers operational information that allows QFabric
system administrators to monitor the health of the QFabric system. A single Routing
Engine instance is generated for the entire QFabric system.
Network Node group Routing Engine—Provides Routing Engine functionality for groups
of Node devices bundled together as a single Layer 3 routing device, which is used to
connect to external networks. A pair of redundant Routing Engine instances is generated
for every network Node group in the QFabric system.
Understanding the Director Group on page 12
Understanding the QFabric System Control Plane
Understanding the QFabric System Hardware Architecture on page 7
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.
Interconnect Device Introduction on page 14
QFX3008-I Interconnect Devices on page 15
QFX3600-I Interconnect Devices on page 16
QFX5100-24Q Interconnect Devices on page 17
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, larger Interconnect devices (such as
the QFX3008-I Interconnect device) implement multistage Clos switching to provide
nonblocking connections between any of the Node devices in the system.
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