Chapter 8, Configuring the Simple Network Management Protocol (SNMP)
The agent, upon receiving this UDP message, first converts the string of bytes in the message into a form it can understand and then performs authentication checks using the community name field contained therein. Upon passing authentication, the agent takes necessary actions to get or set the variable and issues a response indicating success or failure of the operation, which is then interpreted by the management station. There are five different types of PDU used in SNMP. They are:
The commands getid and getone use the get operation while the command setany uses the set operation. The commands getnext, getmany, and snmpstat use the getnext operation. Figure 8-2, ``Flow diagram of the get/getnext operation'', and Figure 8-3, ``Flow diagram of the set operation'', illustrate flow sequences that take place during get and set operations.
Figure 8-2 Flow diagram of the get/getnext operation
Figure 8-3 Flow diagram of the set operation The getnext operation deserves special mention here since it works differently from others. The OID contained in a PDU formed as a result of this operation is taken by the agent, and an object instance whose OID is lexicographically next to this OID is retrieved. For example, referring to Figure 8-3, ``Flow diagram of the set operation'' if the OID contained in a getnext request is 1.3.6.1.2.1.2.2.1.7.2 ifAdminStatus.2, the agent looks for the lexicographically next variable, which could be ifAdminStatus.3, and returns its value. Similarly, when the OID contained in the request is 1.3.6.1.2.1.2.2.1.7.3 (ifAdminStatus.3), the lexicographically next variable chosen by the agent could be 1.3.6.1.2.1.2.2.1.8.1 (ifOperStatus.1). Thus, it can be seen that the getnext operation could be useful in retrieving values of object instances even when the management station is not aware of the instances of an object, as is done by getnext. It could also be useful in retrieving values of all object instances under a subtree of the MIB by starting with the OID of the root object of the subtree, as is done by getmany. Figure 8-4, ``Flow diagram of the trap operation'', illustrates the flow sequence that takes place during the trap operation.
Figure 8-4 Flow diagram of the trap operation
See also:
Footnotes
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Additional Administrative Tasks
Address Resolution Protocol (ARP)
Addressing at the Data Link Layer
Advantages of Packet Switching
Assigning File-Level Permissions on an NTFS Partition
Asynchronous Transfer Mode (ATM)
Band Usage (Baseband or Broadband)
Characteristics of Transmission Media
Coax and Fire Code Classifications
Communications Devices and OSI
Comparing Contention and Token Passing
Configuring Network Adapter Cards
Connection-oriented and Connectionless Modes
Creating and Assigning Permissions to a Shared Folder on Windows NT
Defining a Network Adapter Card
Error and Flow Control at the Data Link Layer
Establishing Troubleshooting Connectivity and Communication
Exercise 1.1: Logging on as a Peer
Exercise 1.2: Windows NT Access Permissions
Exercise 1.3: Exploring the NT Workstation Service
Exercise 10.1: Network Adapter Resource Settings
Exercise 10.2: Windows NT Diagnostics
Exercise 11.1: Mapping a Network Drive
Exercise 12.1: Using Network Monitor
Exercise 12.2: Creating a Chart in Performance Monitor
Exercise 12.3: Performance Monitor Alerts, Logs, and Reports
Exercise 13.1: Modem Troubleshooter
Exercise 13.2: Windows NT Books Online
Exercise 2.1: Gateway Services for NetWare
Exercise 2.2: SLIP and PPP in Dial-Up Networking
Exercise 3.1: Shopping for Network Cabling
Exercise 4.1: Matching Topologies to Applications
Exercise 5.1: Installing Network Protocols in Windows NT
Exercise 5.2: Network Bindings
Exercise 6.1: Enabling IPX Routing
Exercise 7.1: Accessing an X.25 Network Through NT Dial-Up Networking
Exercise 8.1: Creating a User Account in Windows NT
Exercise 8.2: Creating Groups on Windows NT
Exercise 8.3: Sharing a Directory on a Windows NT FAT Partition
Exercise 8.4: Setting NTFS Permissions on a Shared Folder
Exercise 8.5: Sharing a Directory Using Share-Level Security
Exercise 8.6: Sharing a Directory Using User-Level Security
Exercise 8.7: Creating a Local Printer with Windows NT
Exercise 8.8: Sharing a Printer on the Network with Windows 95
Exercise 9.1: Exploring Windows NTs Disk Administrator
Extended LANs (Wireless Bridging)
Finding Resources on Microsoft Networks
Frequency-Division Multiplexing
Handling Other Network Problems
Hardware Access at the Data Link Layer
IEEE 802.3 and IEEE 802.5 Media
Implementing a Fault-Tolerant Design
Implementing Security on Windows 95
Implementing Security on Windows NT
Initiating the Troubleshooting Process
Installing Network Adapter Cards
Internet Control Message Protocol (ICMP)
Managing and Securing a Microsoft Network
Managing User Accounts and Groups Using Windows NT
Narrow-Band Radio Transmission
Network Models: Comparing Server-Based and Peer-to-Peer Configurations
Network Topologies and Architectures
Networking Concepts and Components
Open Shortest Path First (OSPF)
OSI Application Layer Concepts
OSI Presentation Layer Concepts
Physical and Logical Topologies
Printer Sharing with Windows 95
Printer Sharing with Windows NT
Recovering from System Failure
Remote Terminal Emulation (TELNET)
Routing Information Protocol (RIP)
Rules and the Communication Process
Security for Printer Resources
Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP)
Session Layer Session Administration
Share-Level Security on Windows 95
Shielded Twisted-Pair (STP) Cable
Simple Mail Transfer Protocol (SMTP)
Spread-Spectrum Radio Transmission
Standards Organizations and the ISO
Summary of Cable Characteristics
Transmission Control Protocol (TCP)
Transport Layer Connection Services
Troubleshooting Cables and Connectors
Troubleshooting Hubs and MSAUs
Troubleshooting Network Adapter Cards
Troubleshooting Network Performance
Unshielded Twisted-Pair (UTP) Cable
User-Level Security on Windows 95
Virtual Circuit Packet Switching
Wireless Communications with LANs
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