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DES-7200 Configuration Guide Chapter 1 SNMP
Configuration
1.1.2 SNMP Versions
This software supports these SNMP versions:
z SNMPv1: The first formal version of the Simple Network Management
Protocol, which is defined in RFC1157.
z SNMPv2C: Community-based Administrative Framework for SNMPv2, an
experimental Internet protocol defined in RFC1901.
z SNMPv3: Offers the following security features by authenticating and
encrypting packets:
1. Ensure that the data are not tampered during transmission.
2. Ensure that the data come from a valid data source.
3. Encrypt packets to ensure the data confidentiality.
Both the SNMPv1 and SNMPv2C use a community-based security framework.
They restrict administrator’s operations on the MIB by defining the host IP
addresses and community string.
With the GetBulk retrieval mechanism, SNMPv2C sends more detailed error
information type to the management station. GetBulk allows you to obtain all the
information or a great volume of data from the table at a time, and thus reducing
the times of request and response. Moverover, SNMPv2C improves the
capability of handing errors, including expanding error codes to distinguish
different kinds of errors, which are represented by one error code in SNMPv1.
Now, error types can be distinguished by error codes. Since there may be the
management workstations supporting SNMPv1 and SNMPv2C in a network,
the SNMP agent must be able to recognize both SNMPv1 and SNMPv2C
messages, and return the corresponding version of messages.
1.1.3 SNMP Management
Operations
For the information exchange between the NMS and the SNMP Agent, six types
of operations are defined:
1. Get-request: The NMS gets one or more parameter values from the
SNMP Agent.
2. Get-next-request: The NMS gets the next parameter value of one or more
parameters from the SNMP Agent.
3. Get-bulk: The NMS gets a bulk of parameter values from the SNMP
Agent.
4. Set-request: The NMS sets one or more parameter values for the SNMP
Agent.
5. Get-response: The SNMP Agent returns one or more parameter values,
the response of the SNMP Agent to any of the above 3 operations of the
NMS.
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