The TCP/IP suite is used for the transport mechanism. The functions and services are not addressed explicitly in SNMP management.The security management is covered in the administration model as part of communication.The services are covered as part of SNMP operations. 4.5 The Organization Model The initial organization model of SNMP management is a simple two-tier model.It consists of a network agent process,which resides in the managed object, and a network manager process,which resides in the NMS and manages the managed object.This is shown in Figure 4,5(a).Both the manager and the agent are software modules.The agent responds to a any management system that communicates with it using SNMP.Thus,multiple managers can interact with one agent,as shown in Figure 4.5(b)
The TCP/IP suite is used for the transport mechanism. The functions and services are not addressed explicitly in SNMP management. The security management is covered in the administration model as part of communication. The services are covered as part of SNMP operations. 4.5 The Organization Model The initial organization model of SNMP management is a simple two-tier model. It consists of a network agent process, which resides in the managed object, and a network manager process, which resides in the NMS and manages the managed object. This is shown in Figure 4,5(a). Both the manager and the agent are software modules. The agent responds to any management system that communicates with it using SNMP. Thus, multiple managers can interact with one agent, as shown in Figure 4.5(b)
SNMP SNMP SNMP Manager Manager Manager SNMP Agent .8 and SNMP Agent Network Network Element Element (a)One Manager-One Agent (b)Multiple Managers-One Agent Figure 4.5 Two-Tier Organization Models
SNMP a Manager 白2白8小 的A可A2 howlelt Proxy inemela Server Non-SNMP SNMP Managed Managed Objects Objects Figure 4.7 Proxy Server Organization Model
SNMP Manager 园 RMON Probe mnepA 9Mie Managed Objects howtel nem图 Figure 4.6 Three-Tier Organization Model