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SNMP configuration automatically modified after switch management interface removal

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Category:
fabric-interconnect-and-management-switches
Specialty:
hw
Last Updated:

Applies to

  • Cisco N9K-C9336C-FX2
  • Cisco NX-OS 10.4(5)
  • AFF A400
  • ONTAP 9.18.1P1

Issue

After temporal disconnection of the switch's management cable the switch's SNMP configuration on node seems different
  • SNMP Community string is altered with unknown values
  • SNMP version changed from SNMPv3 to SNMPv2c
The altered values can be observed and compared to the unaltered switch. Example:
aff::> system switch ethernet show -device ciscosw-3.sub.domain.com(FLMAABBCCHY)
Device Name: ciscosw-3.sub.domain.com(FLMAABBCCHY)
IP Address: xxx.xxx.xxx.xxx
SNMP Version: SNMPv3
Is Discovered: true
Community String or SNMPv3 Username: operaator_cisco
Model Number: N9K-C9336C-FX2
Switch Network: storage-network
Software Version: Cisco Nexus Operating System (NX-OS) Software, Version 10.4(5)
Reason For Not Monitoring: None
Source Of Switch Version: CDP/ISDP
Is Monitored ?: true
Serial Number of the Device: FLMAABBCCHY
   
aff::> system switch ethernet show -device ciscosw-4.sub.domain.com(FLMDDEEFFQR)
Device Name: ciscosw-4.sub.domain.com(FLMDDEEFFQR)
IP Address: xxx.xxx.xxx.xxx
                                  SNMP Version: SNMPv2c
Is Discovered: true
Community String or SNMPv3 Username: cshm1!
Model Number: N9K-C9336C-FX2
Switch Network: storage-network
Software Version: Cisco Nexus Operating System (NX-OS) Software, Version 10.4(5)
                     Reason For Not Monitoring: Invalid SNMP settings
Source Of Switch Version: CDP/ISDP
Is Monitored ?: false
                   Serial Number of the Device: Unknown
   
   
aff::> system switch ethernet show -device * -status
Monitoring
Switch        Status       Reason
------------- ------------ ------------
ciscosw-3.sub.domain.com(FLMAABBCCHY)
true         None
ciscosw-4.sub.domain.com(FLMDDEEFFQR)
              false        Invalid SNMP settings
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