SNMPv3 is an enhanced standard for SNMP that improves the security and privacy of SNMP access to managed devices and provides sophisticated control of access to the device MIB. The prior standard versions of SNMP, SNMPv1, and SNMPv2c, provided no privacy and little security.


If you downgrade from ExtremeXOS 15.6 to a lower version, the SNMPv3 users do not work if the configuration was saved in 15.6. The SNMPv3 users must be manually created again.

The following RFCs provide the foundation for the Extreme Networks implementation of SNMPv3:



3DES, AES 192 and AES 256 bit encryption are proprietary implementations and may not work with some SNMP Managers.

The SNMPv3 standards for network management were driven primarily by the need for greater security and access control. The new standards use a modular design and model management information by cleanly defining a message processing (MP) subsystem, a security subsystem, and an access control subsystem.

The MP subsystem helps identify the MP model to be used when processing a received Protocol Data Unit (PDU), which are the packets used by SNMP for communication.

The MP layer helps in implementing a multilingual agent, so that various versions of SNMP can coexist simultaneously in the same network.

The security subsystem features the use of various authentication and privacy protocols with various timeliness checking and engine clock synchronization schemes.

SNMPv3 is designed to be secure against:

The access control subsystem provides the ability to configure whether access to a managed object in a local MIB is allowed for a remote principal. The access control scheme allows you to define access policies based on MIB views, groups, and multiple security levels.

In addition, the SNMPv3 target and notification MIBs provide a more procedural approach for generating and filtering of notifications.

SNMPv3 objects are stored in non-volatile memory unless specifically assigned to volatile storage. Objects defined as permanent cannot be deleted.



In SNMPv3, many objects can be identified by a human-readable string or by a string of hexadecimal octets. In many commands, you can use either a character string, or a colon-separated string of hexadecimal octets to specify objects. To indicate hexadecimal octets, use the keyword hex in the command.