NOTE: The first supported release for graceful Routing Engine switchover
and nonstop active routing on the M120 router is Junos OS Release 8.2 and
Junos OS Release 9.0, respectively. Graceful restart software requirements
are dependent on the routing protocols configured on the router. For the
minimum software requirements for graceful restart, see the Junos OS High
Availability Library for Routing Devices.
To take a host subsystem offline:
1. Determine whether the host subsystem is functioning as the master or as the backup,
using one of the two following methods:
•
Check the Routing Engine LEDs on the craft interface. If the green RE MASTER LED
is lit, the corresponding host subsystem is functioning as the master.
•
The master Routing Engine is designated Master in the Current state field when you
issue the command:
user@host> show chassis routing-engine
Routing Engine status: Slot 0: Current state Master
...
2. If the host subsystem is functioning as the master, switch it to backup using the CLI
command:
user@host> request chassis routing-engine master switch
3. On the console or other management device connected to the Routing Engine that is
paired with the CB you are removing, enter CLI operational mode and issue the
following command. The command shuts down the Routing Engine cleanly, so its
state information is preserved:
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 CLI Explorer.
NOTE: The FEB might continue forwarding traffic for approximately 5
minutes after the request system halt command has been issued.
4. On the console or other management device connected to the other Routing Engine,
enter CLI operational mode and issue the following command.
user@host> request chassis cb offline slot n
269Copyright © 2018, Juniper Networks, Inc.
Chapter 31: Maintaining Components and Cables
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