Effect Of Taking The Mx2020 Host Subsystem Offline - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
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Effect of Taking the MX2020 Host Subsystem Offline

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Load averages:
If the host subsystem is functioning as the master, switch it to backup by using the
2.
command:
user@host> request chassis routing-engine master switch
CAUTION: When you request the host subsystem master to switch to
backup, a message appears indicating that the network traffic will be
interrupted while the PFE is reinitialized.
On the console or other management device connected to the Routing Engine you
3.
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
CAUTION: When you request a host subsystem halt, only one Routing
Engine will be halted. You must use the request chassis
both-routing-engines to halt both Routing Engines.
Wait until a message appears on the console confirming that the operating system
has halted.
For more information about the command, see the
NOTE: The Routing Engine might continue forwarding traffic for
approximately 5 minutes after the
issued.
MX2020 Host Subsystem Description on page 57
Maintaining the MX2020 Host Subsystem on page 370
The host subsystem is taken offline and brought online as a unit. Before you replace a
Control Board and Routing Engine (CB-RE) , you must take the host subsystem offline.
The host subsystem is hot-pluggable.
Normally, if two host subsystems are installed in the router, one CB-RE functions as the
master and the other as back-up. You can remove the backup host subsystem (or either
of its components) without interrupting the functioning of the router. If you take the
master host subsystem offline, the backup host subsystem becomes the master.
Depending on the configuration, the individual FRUs may reboot upon switching
mastership. If the router has only one host subsystem, taking the host subsystem offline
1 minute 5 minute 15 minute
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CLI Explorer
request system halt command has been
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