Chapter 6:SNMP Management:SNMPv2 6.1 Major Changes in SNMPv2 Several significant Changes were introduced in SNMPv2.One of the most significant changes was to provide the security functions that SNMPy1 lacked. Unfortunately,after significant effort there was a lack of consensus,so the security feature was dropped from the final specifications.The security function continued to be implemented on an administrative framework based on community name,and the same administrative framework as in SNMPv1 was adopted for SNMPv2.The SNMPv2 Working Group has presented a summary of the community-based Administrative Framework for the SNMPv2 framework,and referred to it as SNMPv2C
Chapter 6: SNMP Management: SNMPv2 6.1 Major Changes in SNMPv2 Several significant Changes were introduced in SNMPv2. One of the most significant changes was to provide the security functions that SNMPv1 lacked. Unfortunately,after significant effort there was a lack of consensus, so the security feature was dropped from the final specifications. The security function continued to be implemented on an administrative framework based on community name, and the same administrative framework as in SNMPv1 was adopted for SNMPv2. The SNMPv2 Working Group has presented a summary of the community-based Administrative Framework for the SNMPv2 framework, and referred to it as SNMPv2C
Chapter 6:SNMP Management:SNMPv2 There are significant differences between the two versions of SNMP,and unfortunately version 2 is not backward-compatible with version 1.RFC 1908 presents implementation schemes for the coexistence of the two versions. The basic components of network management in SNMPv2 are the same as in version 1.They are agent and manager,both performing the same functions. The manager-to-manager communication,shown in Figure 4.8,is formalized in version 2 by adding an additional message.Thus,the organizational model in version 2 remains essentially the same.In spite of the lack of security enhancements,major improvements to the architecture have been made in SNMPv2
Chapter 6: SNMP Management: SNMPv2 There are significant differences between the two versions of SNMP, and unfortunately version 2 is not backward-compatible with version 1. RFC 1908 presents implementation schemes for the coexistence of the two versions. The basic components of network management in SNMPv2 are the same as in version 1. They are agent and manager, both performing the same functions. The manager-to-manager communication, shown in Figure 4.8, is formalized in version 2 by adding an additional message. Thus, the organizational model in version 2 remains essentially the same. In spite of the lack of security enhancements, major improvements to the architecture have been made in SNMPv2
Chapter 6:SNMP Management:SNMPv2 Bulk Data Transfer Message:Two significant messages were added.The first is the ability to request and receive bulk data using the get-bulk message.This speeds up the get-next-request process and is especially useful to retrieve data from tables. Manager-to-Manager Message: The second additional message deals with interoperability of two network management systems.This message extends the communication of management messages between management systems and thus makes network management systems interoperable. Structure of Management Information (SMD): SMI have been consolidated and rewritten in RFCs 1902 through 1904 in SNMPy2
Chapter 6: SNMP Management: SNMPv2 Bulk Data Transfer Message: Two significant messages were added. The first is the ability to request and receive bulk data using the get-bulk message. This speeds up the get-next-request process and is especially useful to retrieve data from tables. Manager-to-Manager Message: The second additional message deals with interoperability of two network management systems. This message extends the communication of management messages between management systems and thus makes network management systems interoperable. Structure of Management Information (SMI): SMI have been consolidated and rewritten in RFCs 1902 through 1904 in SNMPv2
SMIv2 is divided into three parts: module definitions,object definitions,and trap definitions. An ASN.1 macro,MODULE-IDENTITY,is used to define an information module.It concisely conveys the semantics of the information module.OBJECT- TYPE macro defines the syntax and semantics of a managed object.Trap is also termed notification and defined by NOTIFICATION-TYPE macro. Textual Conventions are designed to help define new data types.They are also intended to make the semantics consistent and clear to the human reader. Although new data types could have been created using new ASN.I classes and tags,the decision was made to use the existing defined class types and apply restrictions to them
SMIv2 is divided into three parts: module definitions, object definitions, and trap definitions. An ASN.1 macro, MODULE-IDENTITY, is used to define an information module. It concisely conveys the semantics of the information module. OBJECTTYPE macro defines the syntax and semantics of a managed object. Trap is also termed notification and defined by NOTIFICATION-TYPE macro. Textual Conventions are designed to help define new data types. They are also intended to make the semantics consistent and clear to the human reader. Although new data types could have been created using new ASN. 1 classes and tags, the decision was made to use the existing defined class types and apply restrictions to them
Intemet 1361 SNMPV2 rectory mgmt experimental rivate security snmpv2 ②) 3 ④ (5) (6) Figure6.1 SNMPV2 Internet Group