JUNOS Internet Software Network Operations Guide: Hardware
440 ! Performing A Swap Test
If the Routing Engines are running JUNOS Release 6.0 or later and are
configured for graceful switchover, the standby Routing Engine
immediately assumes Routing Engine functions and there is no
interruption to packet forwarding. Otherwise, packet forwarding halts while
the standby Routing Engine becomes the master and the Packet
Forwarding Engine components reset and connect to the new master
Routing Engine. For information about configuring graceful switchover, see
the section about Routing Engine redundancy in the JUNOS System Basics
Configuration Guide.
4. On the console or other management device connected to the Routing
Engine, enter CLI operational mode and use the following command to
shut down the router software cleanly and preserve Routing Engine state
information:
user@host> request system halt
Wait until a message appears on the console confirming that the operating
system has halted.
For more information about the command, see the JUNOS Protocols, Class
of Service, and System Basics Command Reference.
5. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist
and connect the strap to one of the ESD points on the chassis.
6. Loosen the thumbscrews located at each end of the Routing Engine
faceplate, using a Phillips screwdriver if necessary.
7. Grasp the handle and slide the unit about halfway out of the chassis.
NOTE: Router performance might change if the standby Routing Engine’s
configuration differs from the former master’s configuration. For the most
predictable performance, configure the two Routing Engines identically, except for
parameters unique to a Routing Engine, such as the hostname defined at the
[edit
system]
hierarchy level and the management interface (fxp0 or equivalent) defined
at the
[edit interfaces] hierarchy level.
To configure Routing Engine-specific parameters and still use the same
configuration on both Routing Engines, include the appropriate configuration
statements under the
re0 and re1 statements at the [edit groups] hierarchy level
and use the
apply-groups statement. For instructions, see the JUNOS System Basics
Configuration Guide.
NOTE: The router might continue forwarding traffic for a few minutes after the
request system halt command has been issued.
CAUTION: Slide the Routing Engine straight out of the chassis. Damage can result
if it gets lodged because of uneven movement.
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