The following list contains the number of nonvolatile entries (entries stored in NVRAM) allowed in the SNMPv3 tables. The system does not allow you to create more entries marked nonvolatile after you reach these limits:
snmpCommunityTable: 20
vacmViewTreeFamilyTable: 60
vacmSecurityToGroupTable: 40
vacmAccessTable: 40
usmUserTable: 20
snmpNotifyTable: 20
snmpTargetAddrTabel: 20
snmpTargetParamsTable: 20