Control Board
The QFX3008-I Interconnect device is connected to the QFabric system control plane
through four Gigabit Ethernet small form-factor pluggable plus (SFP+) interfaces on
each Control Board. The Control Boards are hot-insertable and hot-removable
field-replaceable units (FRUs) that are installed in the rear of the chassis in the slots
labeled CB 0 and CB 1. See “Control Board in a QFX3008-I Interconnect Device” on
page 49.
Rear Card
The rear cards act as one stage in the multistage switch fabric data plane in the QFabric
system. The rear cards are hot-insertable and hot-removable field-replaceable units
(FRUs). Eight rear cards are installed in the rear of the chassis in the slots labeled 0
through 7. In a QFX3008-I Interconnect Device, all eight rear cards are active and must
be installed in the switch for normal operation. If a single rear card fails, the input/output
traffic for that card is load-balanced among the remaining rear cards to provide graceful
degradation in switching performance. The impact of a rear card failure on the
performance of a QFX3008-I Interconnect devicevariesbased on the number of QFX3500
Node devices installed in the QFabric system and the traffic mix flowing through them.
See “Rear Cards in a QFX3008-I Interconnect Device” on page 51 and “Understanding
the QFabric System Hardware Architecture” on page 7.
Cooling System
The cooling system in a QFX3008-I Interconnect device consists of ten hot-insertable
and hot-removable field-replaceable unit (FRU) fan trays: a front fan tray, a rear fan tray,
and eight side fan trays. The side fan trays are identical and interchangeable. There are
field-replaceable filters on each side fan tray, and below the front fan tray. See “Cooling
System and Airflow in a QFX3008-I Interconnect Device” on page 44.
Power Supplies and Wiring Trays
Power supplies for the QFX3008-I Interconnect device are fully redundant, load-sharing,
and hot-insertable and hot-removable field-replaceable units (FRUs). Each QFX3008-I
Interconnect device holds six power supplies. See “AC Power Supply in a QFX3008-I
Interconnect Device” on page 52.
Wiring trays distribute the input power to the power supplies. Wiring trays for the
QFX3008-I Interconnect device are fully redundant, hot-insertable and hot-removable
field-replaceable units (FRUs). Each QFX3008-I Interconnect device holds two wiring
trays. See “Wiring Tray in a QFX3008-I Interconnect Device” on page 54.
CAUTION: Mixing different types of wiring trays in the same chassis is not a
supported configuration.
Related
Documentation
Understanding Redundancy of QFX3008-I Interconnect Device Components and
Functionality on page 39
•
37Copyright © 2012, Juniper Networks, Inc.
Chapter 3: QFX3008-I Overview
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