Juniper EX9214

Switch Fabric Module in an EX9200 Switch
The Switch Fabric serves as the central nonblocking matrix through which all network data passes.
Switch Fabric modules (SF modules) are installed horizontally on the front panel of the switch chassis.
You can install either one or two SF modules in an EX9204 or EX9208 switch and two or three SF
modules in an EX9214 switch. A base-conguraon EX9204 or EX9208 switch has only one SF module,
and a base-conguraon EX9214 switch has two SF modules. See EX9204 Switch Conguraons ,
EX9208 Switch Conguraons , or "EX9214 Switch Conguraons" on page 9.
In EX9204 and EX9208 switches, you can add a second SF module to the conguraon for host
subsystem redundancy. In EX9214 switches, you can add a third SF module to the conguraon for host
subsystem redundancy. If two SF modules are installed, one SF module funcons as the primary and the
other funcons as the backup. If the primary SF module or its components fails or is removed, the
backup module takes the role of primary.
The Roung Engine module (RE module) installs directly into a slot on the SF module. The Switch Fabric
contains logic that determines which Roung Engine is the primary. The primary Roung Engine controls
many internal funcons of the SF module.
The backup SF module is hot-insertable and hot-removable, but the primary SF module is only hot-
insertable.
The key funcons of the Switch Fabric are:
• Monitor and control system funcons
• Interconnecon of all line cards
• Clocking, system resets, and boong control
• Roung Engine carrier
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