spontaneous shutdown of every VLAN

[Vale0]

hi what could affect the disabling of VLAN and after some time of inclusion

HP J9091A Switch 8212zl, revision K.15.16.0008, ROM K.15.30

this is reflected in the log

I 01/29/16 12:57:07 00076 ports: AM1: port E17 is now on-line
I 01/29/16 13:02:54 00842 stp: AM1: CIST starved for a BPDU Rx on port A3 from
32768:000a57-f6c800
I 01/29/16 13:02:54 00839 stp: AM1: CST Root changed from 32768: 000a57-f6c800
to 32768: (this device)
I 01/29/16 13:02:54 00002 vlan: AM1: DEFAULT_VLAN virtual LAN disabled
I 01/29/16 13:02:54 00002 vlan: AM1: asup virtual LAN disabled
I 01/29/16 13:02:54 00002 vlan: AM1: mgmt virtual LAN disabled
I 01/29/16 13:02:54 00002 vlan: AM1: WAN-KT virtual LAN disabled
I 01/29/16 13:02:54 00435 ports: AM1: port A3 is Blocked by STP
I 01/29/16 13:06:31 00077 ports: AM1: port E13 is now off-line
I 01/29/16 13:06:34 00435 ports: AM1: port E13 is Blocked by STP
I 01/29/16 13:06:36 00076 ports: AM1: port E13 is now on-line
I 01/29/16 13:10:09 00077 ports: AM1: port G16 is now off-line
I 01/29/16 13:10:13 00435 ports: AM1: port G16 is Blocked by STP
I 01/29/16 13:10:16 00076 ports: AM1: port G16 is now on-line
I 01/29/16 13:11:21 00077 ports: AM1: port I18 is now off-line
I 01/29/16 13:11:26 00435 ports: AM1: port I18 is Blocked by STP
I 01/29/16 13:11:28 00076 ports: AM1: port I18 is now on-line
I 01/29/16 13:11:43 00077 ports: AM1: port I18 is now off-line
I 01/29/16 13:11:47 00435 ports: AM1: port I18 is Blocked by STP
I 01/29/16 13:11:49 00077 ports: AM1: port I18 is now off-line
I 01/29/16 13:11:53 00435 ports: AM1: port I18 is Blocked by STP
I 01/29/16 13:11:55 00076 ports: AM1: port I18 is now on-line
I 01/29/16 13:12:20 00077 ports: AM1: port I18 is now off-line
I 01/29/16 13:12:23 00435 ports: AM1: port I18 is Blocked by STP
I 01/29/16 13:12:26 00076 ports: AM1: port I18 is now on-line
I 01/29/16 13:14:31 00414 SNTP: AM1: Unable to reach configured SNTP servers
I 01/29/16 13:21:34 00839 stp: AM1: CST Root changed from 32768: (this device)
to 32768: 000a57-f6c800
I 01/29/16 13:21:34 00076 ports: AM1: port A3 is now on-line
I 01/29/16 13:21:34 00001 vlan: AM1: DEFAULT_VLAN virtual LAN enabled
I 01/29/16 13:21:34 00001 vlan: AM1: asup virtual LAN enabled
I 01/29/16 13:21:34 00001 vlan: AM1: mgmt virtual LAN enabled
I 01/29/16 13:21:34 00001 vlan: AM1: WAN-KT virtual LAN enabled

[16again]

Seems to me like the link on port A3 goes down,  this causes STP change.
Check cabling on this specific link.


If this switch is core/centre/most-important ,  force it to stay STP root by lowering its STP priority (default = 32768)

[Vale0]

you're right all the default STP priority (default = 32768), the switch is not the core, I should be decreased by CST Root MAC Address: 000a57-f6c800?
CST Root Priority: 32768

 Multiple Spanning Tree (MST) Information

  STP Enabled   : Yes
  Force Version : MSTP-operation
  IST Mapped VLANs : 1-4094
  Switch MAC Address : 5431fb-dbc123
  Switch Priority    : 32768
  Max Age  : 20
  Max Hops : 20   
  Forward Delay : 15

  Topology Change Count  : 1885        
  Time Since Last Change : 53 days     

  CST Root MAC Address : 000a57-f6c800
  CST Root Priority    : 32768       
  CST Root Path Cost   : 20000       
  CST Root Port        : A3                 

  IST Regional Root MAC Address : 5431fb-dbc123
  IST Regional Root Priority    : 32768       
  IST Regional Root Path Cost   : 0           
  IST Remaining Hops            : 20          

  Root Guard Ports     :
  Loop Guard Ports     :
  TCN Guard Ports      :
  BPDU Protected Ports :                                         
  BPDU Filtered Ports  :                                         
  PVST Protected Ports :                                         
  PVST Filtered Ports  :                                         

  Root Inconsistent Ports  :             
  Loop Inconsistent Ports  :             

                   |           Prio              | Designated    Hello         
  Port   Type      | Cost      rity State        | Bridge        Time PtP Edge
  ------ --------- + --------- ---- ------------ + ------------- ---- --- ----
  A1               | Auto      128  Disabled     |               2    Yes No  
  A2               | Auto      128  Disabled     |               2    Yes No  
  A3     1000LX    | 20000     128  Forwarding   | 000a57-f6c800 2    Yes No  
  A4               | Auto      128  Disabled     |               2    Yes No  
  A5               | Auto      128  Disabled     |               2    Yes No  
  A6               | Auto      128  Disabled     |               2    Yes No  
  A7               | Auto      128  Disabled     |               2    Yes No  
  A8               | Auto      128  Disabled     |               2    Yes No  
  A9               | Auto      128  Disabled     |               2    Yes No  
  A10              | Auto      128  Disabled     |               2    Yes No  
  A11              | Auto      128  Disabled     |               2    Yes No  
  A12              | Auto      128  Disabled     |               2    Yes No  
  A13              | Auto      128  Disabled     |               2    Yes No  
  A14              | Auto      128  Disabled     |               2    Yes No  
  A15              | Auto      128  Disabled     |               2    Yes No  
  A16              | Auto      128  Disabled     |               2    Yes No  
  A17              | Auto      128  Disabled     |               2    Yes No  
  A18              | Auto      128  Disabled     |               2    Yes No  
  A19              | Auto      128  Disabled     |               2    Yes No  
  A20              | Auto      128  Disabled     |               2    Yes No  
  A21              | Auto      128  Disabled     |               2    Yes No  
  A22              | Auto      128  Disabled     |               2    Yes No  
  A23              | Auto      128  Disabled     |               2    Yes No  
  A24              | Auto      128  Disabled     |               2    Yes No  
  B1     100/1000T | 20000     128  Forwarding   | 5431fb-dbc123 2    Yes Yes
  B2     100/1000T | 20000     128  Forwarding   | 5431fb-dbc123 2    Yes Yes
  B3     100/1000T | Auto      128  Disabled     |               2    Yes N

[Vince-Whirlwind]

The switch that does your routing (your "core") should have the lowest priority number. (eg, 4K)

Any backup "core" should have their priority set 4k higher than the "core". (eg, 8K)

All your standard Access switches that are one hop away from the "core" should be left on the default priority. (eg, 32K)

Any Access switches that are daisy chained off another Access switch should have their priority increased to 4k higher than the switch they are daisy-chained off. 

[Vale0]

I have not worked with the settings STP, you can give an example of how teams can change the priority

[16again]

It's good practice to lower STP priority on specific switches in the network.  This way, hooking up an old switch (with lower MAC address) won't mess up STP config.
Hower, without topology view, it's hard to tell on which switches STP prio should be lowered on your  network.  STP root should be in the core of your network.

[Vince-Whirlwind]

On the Core, just configure:

spanning-tree priority 0

On the backup core, configure

spanning-tree priority 1

Leave the access switches that are connected directly to the core on the default.

On any Access switches that are daisy chained off other access switches, 

spanning-tree priority 8