Accton Technology ES3552XA, ES3526XA manual SNMPv3 Security Models and Levels, User defined

Simple Network Management Protocol 3

the format of the MIB specifications and the protocol used to access this information over the network.

The switch includes an onboard agent that supports SNMP versions 1, 2c, and 3. This agent continuously monitors the status of the switch hardware, as well as the traffic passing through its ports. A network management station can access this information using software such as HP OpenView. Access to the onboard agent from clients using SNMP v1 and v2c is controlled by community strings. To communicate with the switch, the management station must first submit a valid community string for authentication.

Access to the switch using from clients using SNMPv3 provides additional security features that cover message integrity, authentication, and encryption; as well as controlling user access to specific areas of the MIB tree.

The SNMPv3 security structure consists of security models, with each model having it’s own security levels. There are three security models defined, SNMPv1, SNMPv2c, and SNMPv3. Users are assigned to “groups” that are defined by a security model and specified security levels. Each group also has a defined security access to set of MIB objects for reading and writing, which are known as “views.” The switch has a default view (all MIB objects) and default groups defined for security models v1 and v2c. The following table shows the security models and levels available and the system default settings.

Table 3-4 SNMPv3 Security Models and Levels

Model	Level	Group	Read View	Write View	Notify View	Security
v1	noAuthNoPriv	public	defaultview	none	none	Community string only
		(read only)
v1	noAuthNoPriv	private	defaultview	defaultview	none	Community string only
		(read/write)
v1	noAuthNoPriv	user defined	user defined	user defined	user defined	Community string only
v2c	noAuthNoPriv	public	defaultview	none	none	Community string only
		(read only)
v2c	noAuthNoPriv	private	defaultview	defaultview	none	Community string only
		(read/write)
v2c	noAuthNoPriv	user defined	user defined	user defined	user defined	Community string only
v3	noAuthNoPriv	user defined	user defined	user defined	user defined	A user name match only
v3	AuthNoPriv	user defined	user defined	user defined	user defined	Provides user
						authentication via MD5 or
						SHA algorithms
v3	AuthPriv	user defined	user defined	user defined	user defined	Provides user
						authentication via MD5 or
						SHA algorithms and data
						privacy using DES 56-bit
						encryption

Note: The predefined default groups and view can be deleted from the system. You can then define customized groups and views for the SNMP clients that require access.

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