CAUTION: Before you replace a Routing Engine, you must take the host
subsystem offline. If there is only one host subsystem, taking the host
subsystem offline shuts down the router. See “Taking the M120 Host
Subsystem Offline” on page 267.
CAUTION: If the Routing Engine to be replaced is currently functioning as
the master Routing engine, switch it to be the backup before removing it. See
“Taking the M120 Host Subsystem Offline” on page 267.
To remove a Routing Engine from a CB (see Figure 69 on page 197):
1. Take the host subsystem offline as described in “Taking the M120 Host Subsystem
Offline” on page 267.
2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
3. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
4. Press the red tabs on the ejector handles on both sides of the Routing Engine faceplate.
5. Flip the ejector handles outward to unseat the Routing Engine.
6. Grasp the Routing Engine by the ejector handles and slide it about halfway out of the
chassis.
7. Place one hand underneath the Routing Engine to support it and slide it completely
out of the chassis.
8. Place the Routing Engine on the antistatic mat.
NOTE: To maintain proper airflow through the chassis, do not leave a CB
installed in the chassis without a Routing Engine for extended periods of
time. If a Routing Engine is removed,a replacementRoutingEngine should
be installed as soon as possible.
Copyright © 2018, Juniper Networks, Inc.196
M120 Multiservice Edge Router Hardware Guide
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