Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
574 ! Performing a Swap Test on a Redundant MCS
Action To perform a swap test on the MCS, remove it and replace it with one that you know
works.
Normally, if two host modules are installed in the router,
HOST0 functions as the
master and
HOST1 as the backup. You can remove the backup host module (or
either of its components) without interrupting the functioning of the router. If you
take the master host module offline, the router reboots and the backup host module
becomes the master. If the router has only one host module, taking it offline causes
the router to shut down.
The host module is taken offline and brought back online as a unit. Before you
replace the Routing Engine or an MCS, you must take the host module offline. The
host module is hot-pluggable.
To remove an MCS, follow these steps:
1. Lay an electrostatic bag or antistatic mat on a flat, stable surface to receive the
Routing Engine.
2. Attach an electrostatic discharge (ESD) strap to your bare wrist and connect the
strap to one of the ESD points on the chassis.
3. Remove the rear component cover by loosening the screws at the corners of the
cover and pulling it straight off of the chassis.
4. If two host modules are installed, check whether the MCS you are removing
belongs to the master host module with the following CLI command:
user@host> show chassis environment mcs
Or you can check the MCS LEDs. If the MCS belongs to the master host module,
switch mastership to the standby host module by including the
routing-engine
statement at the
[edit chassis redundancy] hierarchy level in the configuration,
as described in the JUNOS System Basics Configuration Guide.
5. On the console or other management device connected to the Routing Engine
that is paired with the MCS you are removing, enter CLI operational mode and
issue the following command:
user@host> request system halt
The command shuts down the Routing Engine cleanly, so its state information
is preserved.
Wait to continue until all software processes have shut down.
6. Flip the ends of the extractor clips outward.
7. Grasp the extractor clips and slide the unit about halfway out of the chassis.
8. Place one hand under the MCS to support it, slide it completely out of the
chassis, and place it on the antistatic mat or in the electrostatic bag.
9. Align the rear of the MCS with the guides inside the chassis and slide it in
completely.

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English