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CHAPTER 9: NETWORK MANAGEMENT

CHAPTER 9: NETWORK MANAGEMENT. Management Information Base Abstract Syntax Notation Simple Network Management Protocol. NETWORK MANAGEMENT. The manager endstation (running client software) contacts each agent (running server software), querying for management data. Manager. Agent. Agent.

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CHAPTER 9: NETWORK MANAGEMENT

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  1. CHAPTER 9: NETWORK MANAGEMENT • Management Information Base • Abstract Syntax Notation • Simple Network Management Protocol

  2. NETWORK MANAGEMENT The manager endstation (running client software) contacts each agent (running server software), querying for management data. Manager Agent Agent Agent Agent Agent Agent Non-Agent Non-Agent Agent CS 447 Chapter 9 Page 202

  3. STANDARD MANAGEMENT INFORMATION BASE VARIABLES Meaning MIB Variable Category Time since last reboot sysUpTime Operating System Number of network interfaces ifNumber Network Interfaces Max. xfer unit for particular interface ifMtu Network Interfaces Value IP uses in time-to-live field ipDefaultTTL IP Number of datagrams received ipInReceives IP Number of datagrams forwarded ipForwDatagrams IP Number of routing failures ipOutNoRoutes IP Number of datagrams reassembled ipReasmOKs IP Number of datagrams fragmented ipFragOKs IP IP Routing Table ipRoutingTable IP Number of ICMP Echo Requests received icmpInEchos ICMP Minimum retransmission time TCP allows tcpRtoMin TCP Maximum TCP connections allowed tcpMaxConn TCP Number of segments TCP has received tcpInSegs TCP Number of UDP datagrams received udpInDatagrams UDP Number of EGP messages received egpInMsgs EGP CS 447 Chapter 9 Page 203

  4. STRUCTURE OF MIB OBJECT NAMES iso 1 itu 2 joint iso/itu 3 org 3 internet 1 directory 1 mgmt 2 experimental 3 private 4 mib 1 system 1 interfaces 2 addr. trans. 3 ip 4 icmp 5 tcp 6 udp 7 egp 8 unnamed The variables used in TCP-based management protocols use the Management Information Base standard, which uses the hierarchical namespace that is partially outlined at right. dod 6 Example: The MIB object name 1.3.6.1.2.1.37.1.5.1.8 corresponds to ATM’s QoS iso(1). org(3). dod(6). internet(1). mgmt(2). mib-2(1). atmMIB(37). atmMIBObjects(1). atmTrafficDescrParamTable(5). atmTrafficDescrParamEntry(1) CS 447 Chapter 9 Page 204

  5. ABSTRACT SYNTAX NOTATION (ASN.1) The object definition language adopted by the OSI, ASN.1 encodes data in a standard fashion, as a three-field structure: Identifier Tag Length of Data Data Another example, the ASCII string “OW!” is represented as: For example, the integer 100 is represented as: 02 01 64 04 03 4F 57 21 Type 2: Integer Length: 1 Byte Value in Hexadecimal Type 4: String Length: 3 Bytes Value in Hexadecimal CS 447 Chapter 9 Page 205

  6. SIMPLE NETWORK MANAGEMENT PROTOCOL 30 29 02 01 00 Type 48: Sequence Length: 41 Bytes Type 2: Integer Length: 1 Byte Version: 0 04 06 70 75 62 6C 69 63 Type 4: String Length: 6 Bytes Value: “public” A0 1C 02 04 05 AE 56 02 Length: 28 Bytes Type 2: Integer Length: 4 Bytes getreq. Request ID 02 01 00 02 01 00 Error Index Type 2: Integer Length: 1 Byte Type 2: Integer Length: 1 Byte Status 30 0E 30 0C 06 08 Type 48: Sequence Length: 14 Bytes Type 48: Sequence Length: 12 Bytes Object ID Length: 8 Bytes 2B 06 01 02 01 01 01 00 Data Item sysDescr (numeric object identifier 43 . 6 . 1 . 2 . 1 . 1 . 1 . 0 05 00 Length: 0 Bytes Null SNMP uses ASN.1 to format communications between managers and agents, as shown at right. This particular SNMP message is a request for the sysDescr data item. CS 447 Chapter 9 Page 206

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