Isolation of switch from the stack

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From a 3 switch Summit stack,One of the switch has been moved out of stack. I am unable to find the reason why the switch has been moved out, can someone guide me to find the cause of the issue?
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svven

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Posted 3 years ago

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Grosjean, Stephane, Employee

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Hi,
was it a running stack that suddenly lost one member, or is it a stack you just installed, and one switch can't join the stack?
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svven

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It's an running stack all of sudden it got disappear.

From the master switch i could able to see the below logs

01/14/2016 08:02:58.32 <Warn:DM.Warning> Slot-1: BACKUP NODE (Slot-2) DOWN
01/14/2016 07:51:49.18 <Warn:DM.Warning> Slot-1: Previous message repeated 102 additional times in the last 662 second(s)
01/14/2016 07:51:43.53 <Info:AAA.authPass> Slot-1: Login passed for user admin through serial slot-1
01/14/2016 07:51:42.68 <Warn:DM.Warning> Slot-1: BACKUP NODE (Slot-2) DOWN
01/14/2016 07:45:25.61 <Warn:DM.Warning> Slot-1: Previous message repeated 58 additional times in the last 371 second(s)
01/14/2016 07:45:22.53 <Info:AAA.logout> Slot-1: User admin logout from telnet (195.0.0.101)
01/14/2016 07:45:19.11 <Warn:DM.Warning> Slot-1: BACKUP NODE (Slot-2) DOWN
01/14/2016 06:14:33.42 <Warn:DM.Warning> Slot-1: Previous message repeated 835 additional times in the last 5439 second(s)


-> show switch        

SysName:          Coddissia_ONM_IPSwitch
SysLocation:      COIMBATORE-CODISSIA
SysContact:       ERICSSON
System MAC:       02:04:96:51:A1:38
System Type:      X450a-48t (Stack)

SysHealth check:  Enabled (Normal)
Recovery Mode:    All
System Watchdog:  Enabled

Current Time:     Thu Jan 14 08:02:22 2016
Timezone:         [Auto DST Disabled] GMT Offset: 330 minutes, name is India.
Boot Time:        Tue Oct 11 20:12:27 2011
Boot Count:       10
Next Reboot:      None scheduled
System UpTime:    1555 days 11 hours 49 minutes 55 seconds

Slot:             Slot-1 *                     Slot-2                 
                  ------------------------     ------------------------
Current State:    MASTER                       BACKUP                 

Image Selected:   primary                                             
Image Booted:     primary                                        


In Secondary switch (Slot 2)


show switch        

SysName:          Coddissia_ONM_IPSwitch
SysLocation:      COIMBATORE-CODISSIA
SysContact:       ERICSSON
System MAC:       02:04:96:51:A1:38
System Type:      X450a-48t (Stack)

SysHealth check:  Enabled (Normal)
Recovery Mode:    All
System Watchdog:  Enabled

Current Time:     Thu Jan 14 08:36:36 2016
Timezone:         [Auto DST Disabled] GMT Offset: 330 minutes, name is India.
Boot Time:        Tue Oct 11 20:12:26 2011
Boot Count:       11
Next Reboot:      None scheduled
System UpTime:    1555 days 12 hours 10 minutes 5 seconds

Slot:             Slot-2 *                     No Backup              
                  ------------------------     ------------------------
Current State:    MASTER                                              

Image Selected:   primary                                             
Image Booted:     primary                                             


01/12/2016 22:19:09.43 <Noti:DM.Notice> Slot-2: Failover occurred ()
01/12/2016 22:19:08.63 <Info:HAL.Card.Info> Slot-2: Node failover initialized slot 2.
01/12/2016 22:19:08.32 <Info:vlan.dbg.info> Slot-2: Port 1:48 is Down, remove from aggregator 1:48
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MANAS BEHERA

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Hello, 

It is not clear based on the logs.  Please share below commands output.

show log messages nvram from master switch.
show log messages nvram from the failed switch.
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Patrick Voss, Alum

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See if you can console into the stack and also provide the output to "show stacking" and "show slot detail" from the current master.
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Tony Thornton, Extreme Alumnus

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Also, if you have an external syslog server configured for the stack, you can check the log history for slot 2 to see if any messages were logged just before the reboot.  Some log messages are deleted after a switch reboots.