Juniper QFabric QFX3008-I, Manual, Page: 77 / 472

•
Control Board LEDs—Indicate system status. See “Control Board LEDs on a QFX3008-I
Interconnect Device” on page 389 .
• USB port—Provides an interface through which you can recover the device by reinstalling
Junos OS software. See
“USB Port Specifications for the QFX Series” on page 105 and
“Performing a Recovery Installation on a QFX3500 Device and QFX3008-I Interconnect
Device” on page 409
.
• Console port—Connects the Control Board to a management console through a serial
connection using a cable with an RJ-45 connector. See
“Connecting a QFX Series Device
to a Management Console” on page 285 .
• Auxiliary port—This port is not enabled. It is reserved for future use.
• Management port—This port is not enabled. It is reserved for future use.
•
Four Gigabit Ethernet SFP+ ports—Connect the Control Board to the QFX3000-G
QFabric system control plane network. See
“Connecting a QFX3008-I Interconnect
Device to the Control Plane Network” on page 278 .
• Ejector levers—Used for installing and removing the Control Board.
Related
Documentation
Installing a Control Board in a QFX3008-I Interconnect Device on page 349
•
•
Removing a Control Board from a QFX3008-I Interconnect Device on page 347
Rear Cards in a QFX3008-I Interconnect Device
The rear cards provide the intermediate stage of switch fabric functionality in a QFX3008-I
Interconnect Device. See
Figure 26 on page 51 .
A QFX3008-I Interconnect Device has eight rear cards. In the QFX3008-I Interconnect
Device, all eight rear cards are simultaneously active when the device is operational. All
rear cards are fully connected to all installed 16-port QSFP+ front cards. If a single rear
card fails, the input/output traffic for that card is load-balanced among the remaining
rear cards, providing graceful degradation in switching performance. The impact of a rear
card failure on the performance of a QFX3008-I Interconnect Device varies based on the
number of 16-port QSFP+ front cards installed in the device and the traffic mix flowing
through them.
Figure 26: Rear Card in a QFX3008-I Interconnect Device
g050157
Rear card status LEDs
Ejector levers
51 Copyright © 2012, Juniper Networks, Inc.
Chapter 3: QFX3008-I Overview