Extreme Networks ExtremeWare XOS Command Reference Manual page 566

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
Commands for Status Monitoring and Statistics
Summit X450 Family of Switches Only. On a Summit X450 family switch, after you clear the shutdown
state, use the command to bring the switch and ports back online. After you use the reboot
reboot
command, the switch is operational.
Differences in the Command Line Prompt. When an exclamation point (!) appears in front of the command
line prompt, it indicates that one or more slots of a modular switch or the entire stand-alone switch is
shut down as a result of your hardware recovery configuration and a switch error.
The following is sample truncated output of the command line prompt for a modular switch:
The I/O modules in the following slots are shut down: 1,3
Use the "clear sys-recovery-level" command to restore I/O modules
! BD-8810.1 #
The following is sample output for the Summit X450 family of switches:
All switch ports have been shut down.
Use the "clear sys-recovery-level" command to restore all ports.
! SummitX450-24x.1 #
Example
The following command clears the shutdown state:
clear sys-recovery-level
History
This command was first available in ExtremeWare XOS 11.5.
Platform Availability
This command is available on all platforms.
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ExtremeWare XOS 11.5 Command Reference Guide