CHAPTER 27
Replacing Host Subsystem Components
•
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
Replacing the T640 Host Subsystem Components
•
Taking the T640 Host Subsystem Offline on page 307
Taking the T640 Host Subsystem Offline
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, RE0 functions as the
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.
Table 91: Effect of Taking the Host Subsystem Offline
Effect of Taking the Host Subsystem OfflineType of Host Subsystem
The router shuts down.Nonredundant host
subsystem
The functioning of the router is not interrupted. The backup host subsystem is hot-removable
and hot-insertable.
Backup host subsystem
307Copyright © 2017, Juniper Networks, Inc.
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