Switch Fabric Module In An Ex9200 Switch - Juniper EX9214 Hardware Manual

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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-configuration EX9204 or EX9208 switch has only one SF module,
EX9204 Switch Configurations
and a base-configuration EX9214 switch has two SF modules. See ,
EX9208 Switch Configurations
, or "EX9214 Switch Configurations" on page 9.
In EX9204 and EX9208 switches, you can add a second SF module to the configuration for host
subsystem redundancy. In EX9214 switches, you can add a third SF module to the configuration for host
subsystem redundancy. If two SF modules are installed, one SF module functions as the primary and the
other functions as the backup. If the primary SF module or its components fails or is removed, the
backup module takes the role of primary.
The Routing Engine module (RE module) installs directly into a slot on the SF module. The Switch Fabric
contains logic that determines which Routing Engine is the primary. The primary Routing Engine controls
many internal functions 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 functions of the Switch Fabric are:
• Monitor and control system functions
• Interconnection of all line cards
• Clocking, system resets, and booting control
• Routing Engine carrier