Host Subsystem In An Ex9200 Switch; Routing Engine Module In An Ex9200 Switch - Juniper EX9214 Hardware Manual

Host Subsystem in an EX9200 Switch

Switching and routing functionality, system management, and system control functions of an EX9200
switch are performed by host subsystem. A host subsystem consists of a Routing Engine functioning
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 configuration EX9204 and EX9208 switch has one host subsystem. A redundant configuration
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
configuration EX9214 switch has two host subsystems. A redundant configuration EX9214 switch has a
third host subsystem.
NOTE: In EX9204 and EX9208 switches, we recommend that you install two host subsystems
for redundant protection. 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 protection. 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 craft interface that display its status. See
EX9200 Switch" on page
SEE ALSO
Taking the Host Subsystem Offline in an EX9200 Switch
Maintaining the Host Subsystem in EX9200 Switches

Routing Engine Module in an EX9200 Switch

The Routing Engine module (RE module) is an Intel-based platform that runs Juniper Networks Junos
operating system (Junos OS). Software processes that run on the RE module maintain the routing tables,
manage the routing 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 functions as the primary and the other functions as the backup. If the primary RE module
fails or is removed and the backup is configured appropriately, the backup takes over as the primary. The
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"Craft Interface in an
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