Replacing Host Subsystem Components; Replacing The T640 Host Subsystem Components; Taking The T640 Host Subsystem Offline; Table 91: Effect Of Taking The Host Subsystem Offline - Juniper T640 Hardware Manual

CHAPTER 27

Replacing Host Subsystem Components

Replacing the T640 Host Subsystem Components

Taking the T640 Host Subsystem Offline

Table 91: Effect of Taking the Host Subsystem Offline

Type of Host Subsystem
Nonredundant host
subsystem
Backup host subsystem
Copyright © 2017, Juniper Networks, Inc.
Replacing the T640 Host Subsystem Components on page 307
Replacing a T640 LCC-CB on page 310
Replacing a T640 Standard Control Board or T-CB on page 313
Replacing a T640 Routing Engine on page 317
Replacing a CompactFlash Card in a T640 RE-C1800 Routing Engine on page 320
Replacing a DIMM Module in a T640 Routing Engine on page 324
Replacing a PC Card in a T640 Routing Engine on page 325
Replacing a Solid-State Disk in a T640 RE-C1800 Routing Engine on page 327
Taking the T640 Host Subsystem Offline on page 307
The host subsystem is taken offline and brought online as a unit. Before you replace a
control board or Routing Engine, you must take the host subsystem offline.
Normally, if two host subsystems are installed in the T640 router,
master and RE1 functions as the backup. You can remove the backup host subsystem
(or either of its components) without interrupting the functioning of the router. If you
take the master host subsystem offline, the backup host subsystem becomes the master
(the router might reboot, depending on your configuration). If the router has only one
host subsystem, taking the host subsystem offline causes the router to shut down.
Table 91 on page 307 explains the effect of taking the host subsystem offline.
Effect of Taking the Host Subsystem Offline
The router shuts down.
The functioning of the router is not interrupted. The backup host subsystem is hot-removable
and hot-insertable.
functions as the
RE0
307