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Sys-recovery-level options and their explanation

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TitleSys-recovery-level options and their explanation
Question
What are the sys-recovery level configuration in EXOS and what is their significance?
Environment
  • Exos All
  • Summit and Black-diamond series
Answer
Sys-recovery-level are the options in EXOS which explains how the switch should react to a hardware or software failure. 
 
Command: 

configure sys-recovery-level slot [all | slot_number] [none | reset | shutdown]

The default setting is reset.

• none—Configures the MSM/MM or I/O module to maintain its current state regardless of the detected fault.The offending MSM/MM or I/O module is not reset. 

• reset—Configures the offending MSM/MM or I/O module to reset upon fault detection. ExtremeXOS logs fault, error, system reset, and system reboot messages to the syslog.

• shutdown—Configures the switch to shut down all slots/modules configured for shutdown upon fault detection. ExtremeXOS logs fault, error, system reset, system reboot, and system shutdown messages to the syslog.

When all the slots in a stack or a chassis based switch are configured for shutdown, Hardware or software failure in one slot would shutdown all the slots. 
In the shutdown state, all the ports are offline and only console access works for debugging purpose. 
When configuring this option in production, the above consequences should be taken into consideration. 

 
Additional notes
Sys-recovery setting would be triggered when the MSM or the master node of the stack detects any hardware of software failure of the slot based on the slot failure messages. 

Also refer to the article below: 
What does it mean when an exclamation point (!) appears in front of the command line prompt?
 

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