T640 Routing Engine Description - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
Related
Documentation

T640 Routing Engine Description

36
NOTE: 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
RE0
Each host subsystem has three LEDs that display its status. The host subsystem LEDs
are located on the upper right of the craft interface. For more information about the host
subsystem LEDs, see "T640 Craft Interface Host Subsystem LEDs" on page
T640 Hardware Component Overview on page 13
T640 Routing Engine Description on page 36
T640 Control Boards Description
Taking the T640 Host Subsystem Offline on page 307
Maintaining the T640 Host Subsystem on page 447
The Routing Engine runs Junos OS. The software processes that run on the Routing Engine
maintain the routing tables, manage the routing protocols used on the router, control
the router interfaces, control some chassis components, and provide the interface for
system management and user access to the router.
The T640 router is shipped with Junos OS preinstalled and ready to be configured when
the T640 router is powered on. There are three copies of the software: one on a
CompactFlash card in the Routing Engine, one on a hard disk or solid-state drive in the
Routing Engine, and one on a PC Card or USB storage device that can be inserted into
the slot in the Routing Engine faceplate.
You can install one or two Routing Engines in the router. The Routing Engines install into
the upper rear of the chassis in the slots labeled
a control board to be installed in the adjacent slot.
installs above CB1 . A Routing Engine does not power up without a control board present
in the adjacent slot.
NOTE: If two Routing Engines are installed, they must both be the same
hardware model.
If two Routing Engines are installed, one functions as the master and the other acts as
the backup. If the master Routing Engine fails or is removed, and the backup is configured
appropriately, the backup takes over as the master. If the host system is redundant, the
backup Routing Engine is hot-removable and hot-insertable, but the master Routing
Engine is hot-pluggable. A Routing Engine that is not redundant requires that you power
down the router before replacement.
.
and
RE0 RE1
installs below
RE0
Copyright © 2017, Juniper Networks, Inc.
24.
. Each Routing Engine requires
, and
CB0 RE1