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162 C
HAPTER 9: SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP)
About SNMP
This section provides an overview of SNMP. For further information about the
SNMP protocol, refer to the RFCs listed below or other general publications
specific to SNMP.
SNMP is a network management protocol that provides a standard for
network management systems. In the SNMP scheme, a network
management system contains two primary components: a manager and
agents. The manager is the workstation or console where the network
administrator performs network management functions. Agents are entities
that interface with the device being managed. The Cuda 12000 runs an
SNMP agent.
Devices, such as the Cuda 12000, that are managed using SNMP contain
managed objects, such as configuration parameters and performance
statistics. These objects are defined in a management information base
(MIB). SNMP allows managers and agents to communicate for the purpose
of accessing MIB objects.
SNMP provides access control to MIB objects, which defines who can access
MIB objects and their associated access privileges. In SNMPv1 and v2c,
access control is managed through associations of agents and managers
called communities and security groups. In SNMPv3, access control is
managed by the user and context, and an associated security group. Refer to
“Configuring SNMP Access Control” on page 164 for more information on
access control.
SNMP security is defined by Security Models and Security Levels. A
combination of a security model and a security level determines which
security mechanism is used when handling an SNMP packet. A security
model may authenticate messages by providing data integrity, data origin
authentication, data confidentiality, message timeliness and limited replay
protection. A security model is set up for a user and the group in which the
user resides. A security level is the permitted level of security within a security
model. The level of security is determined primarily by the specific SNMP
application implementation and by the specific security model
implementation.
The Cuda 12000 supports DOCSIS 1.1 OSS Interface Specification
(SP-OSSIv1.1-I02-000714) and SNMP configuration, as defined by RFCs
1157, 2571, 2572, 2573, 2574, 2575 and 2576.