LevelOne GTL-2881, Руководство пользователя

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Chapter 13
| Basic Administration Protocols
Simple Network Management Protocol
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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 network management software. 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 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.
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.
Table 29: SNMPv3 Security Models and Levels
Model Level Group Read View Write View Notify View Security
v1 noAuthNoPriv public
(read only)
defaultview none none Community string only
v1 noAuthNoPriv private
(read/write) defaultview defaultview none Community string only
v1 noAuthNoPriv user defined user defined user defined user defined Community string only
v2c noAuthNoPriv public
(read only) defaultview none none Community string only
v2c noAuthNoPriv private
(read/write) defaultview defaultview none Community string only
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