Host Subsystem in an EX9200 Switch
Switching and roung funconality, system management, and system control funcons of an EX9200
switch are performed by host subsystem. A host subsystem consists of a Roung Engine funconing
together with a Switch Fabric.
You can install either one or two host subsystems in the front panel of an EX9204 or an EX9208 switch.
A base conguraon EX9204 and EX9208 switch has one host subsystem. A redundant conguraon
EX9204 and EX9208 switch has a second host subsystem.
You can install either two or three host subsystems in the front panel of an EX9214 switch. A base
conguraon EX9214 switch has two host subsystems. A redundant conguraon EX9214 switch has a
third host subsystem.
NOTE: In EX9204 and EX9208 switches, we recommend that you install two host subsystems
for redundant protecon. If you install only one host subsystem, we recommend that you install
it in slot 0. In EX9214 switches, we recommend that you install three host subsystems for
redundant protecon. If you install only two host subsystems, we recommend that you install it
in slot 0 and 1.
Each host subsystem has LEDs in the craî™› interface that display its status. See "Craî™› Interface in an
EX9200 Switch" on page 29.
SEE ALSO
Taking the Host Subsystem Oine in an EX9200 Switch
Maintaining the Host Subsystem in EX9200 Switches
Roung Engine Module in an EX9200 Switch
The Roung Engine module (RE module) is an Intel-based plaorm that runs Juniper Networks Junos
operang system (Junos OS). Soware processes that run on the RE module maintain the roung tables,
manage the roung protocols used on the switch, control the router interfaces and some of the chassis
components, and provide the interface for system management and user access to the switch.
In an EX9204, EX9208, or EX9214 switch, you can install one or two RE modules in the Switch Fabric
modules (SF modules) that are installed in slots on the front panel of the switch. If you install two RE
modules, one funcons as the primary and the other funcons as the backup. If the primary RE module
fails or is removed and the backup is congured appropriately, the backup takes over as the primary. The
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