Taking an MX2000 Host Subsystem Offline
To take a host subsystem offline:
- Determine whether the host subsystem is functioning as
the primary or as the backup, using one of the two following methods:
Check the Routing Engine LEDs on the craft interface. If the green
MASTERLED is lit, the corresponding host subsystem is functioning as the primary.
Issue the following command. The primary Routing Engine is designated
user@host> show chassis routing-engine
Routing Engine status: Slot 0: Current state Master Election priority Master (default) Temperature 35 degrees C / 95 degrees F CPU temperature 32 degrees C / 89 degrees F DRAM 16351 MB (16384 MB installed) Memory utilization 7 percent CPU utilization: User 0 percent Background 0 percent Kernel 4 percent Interrupt 1 percent Idle 95 percent Model RE-S-1800x4 Serial ID 9009094145 Start time 2013-02-19 18:06:24 PST Uptime 14 hours, 29 minutes, 41 seconds Last reboot reason Router rebooted after a normal shutdown. Load averages: 1 minute 5 minute 15 minute 0.00 0.00 0.00 Routing Engine status: Slot 1: Current state Backup Election priority Backup (default) Temperature 36 degrees C / 96 degrees F CPU temperature 32 degrees C / 89 degrees F DRAM 16351 MB (16384 MB installed) Memory utilization 7 percent CPU utilization: User 0 percent Background 0 percent Kernel 0 percent Interrupt 0 percent Idle 99 percent Model RE-S-1800x4 Serial ID 9009094136 Start time 2013-02-19 18:06:33 PST Uptime 14 hours, 29 minutes, 22 seconds Last reboot reason Router rebooted after a normal shutdown. Load averages: 1 minute 5 minute 15 minute 0.00 0.00 0.00
- If the host subsystem is functioning as the primary, switch
it to backup by using the command:
user@host> request chassis routing-engine master switch
When you request the host subsystem primary to switch to backup, a message appears indicating that the network traffic will be interrupted while the Packet Forwarding Engine is reinitialized.
- On the console or other management device connected to
the Routing Engine 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
When you request a host subsystem halt, only one Routing Engine will be halted. You must use the request chassis both-routing-engines command 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 Junos OS System Basics and Services Command Reference
The Routing Engine might continue forwarding traffic for approximately 5 minutes after the request system halt command has been issued.