Qfx3008-I Interconnect Devices; Figure 5: Clos Switching For Qfx3008-I Interconnect Devices - Juniper QFabric QFX3000-G Hardware Documentation

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QFX3008-I Interconnect Devices

Figure 5 on page 15

shows an example of how Clos switching works in the QFX3008-I

Interconnect device.

Incoming traffic

Outgoing traffic

Traffic enters a QSFP+ port from a Node device, and an ingress chipset provides stage

F1 processing. For the F2 stage, the frame is sent to a rear card and processed by a

midplane chipset. Lastly, an egress chipset on the front card QSFP+ port handles

processing tasks for the F3 stage. At each of the three Clos stages, a switching table

chooses the best path and determines where to send the frame to reach the next stage.

The F1 and F3 stages can be handled by the same front card or different front cards,

depending on the best path selected by the fabric. After the frame traverses the

Interconnect device backplane, the Interconnect device sends the frame to the egress

Node device.

The QFX3008-I Interconnect device contains eight slots in the front of the chassis. In

each slot, you can install a front card containing 16 40-Gbps quad small form-factor

pluggable plus (QSFP+) ports. A fully configured system offers a total capacity of 128

QSFP+ connections. These front card ports attach to the high-speed backplane to reach

the eight slots in the rear of the chassis, which provide the heavy-duty interconnections

for the entire QFX3000-G QFabric system. In addition, four interfaces (two per Control

Board) provide Gigabit Ethernet access to the control plane management network.

Figure 6 on page 16

shows an example of the data plane and control plane connections

for QFX3008-I Interconnect devices.

Chapter 1: QFX3000-G QFabric System Overview

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