Juniper Networks M10i manual User@host request chassis routing-engine master switch

Chapter 13: Replacing Hardware Components

user@host> show chassis routing-engine

Routing Engine status:
Slot 0:
Current state	Master
...

3.If you are removing the master Routing Engine and a second Routing Engine is installed, issue the following CLI command to switch mastership to the standby host module:

user@host> request chassis routing-engine master switch

If the Routing Engines are configured for graceful switchover and are running a JUNOS release that supports 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.

We recommend you run JUNOS Release 7.0 or later on the M10i router to support graceful switchover.

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-groupsstatement. For instructions, see the JUNOS System Basics Configuration Guide.

4.On the console or other management device connected to the Routing Engine, enter CLI operational mode and issue the following command to shut down the router software cleanly and preserve Routing Engine state information.

user@host> request system halt

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