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System and Network Management

System and Network Management. Network Management : ability to monitor, control and plan the resources and components of computer system and networks network management is a problem created by computer!. Goal of Management. Keeping Network Running Maintaining Network performance

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System and Network Management

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  1. System and Network Management • Network Management : ability to monitor, control and plan the • resources and components of computer system and networks • network management is a problem created by computer!

  2. Goal of Management • Keeping Network Running • Maintaining Network performance • Reducing the Cost of Ownership

  3. Manager Network Management Protocol agent agent agent Architecture of Management • Manager : monitor and control the agents • Agents: • softwarte componentes residing in mangaed devices • responds to requests from manager • Network Management Protocol • protocol used to communicated between Manager and agents

  4. SNMP • Easy-to-implement network management tool fot TCP/IP suite of protocols • SNMP : a collection of specification • actual protocols • definition of manage information • other related components

  5. SNMP Manager Simple Network Management Protocol SNMP agent SNMP agent SNMP agent SNMP model • SNMP components • manager, • agent and • protocol

  6. Software Components Hardware Components SNMP agent request response SNMP agent • Software process that respons to SNMP protocol • resides in networks equipments such as hub, router, bridges or workstaions • Two basic roles • monitoring • controlling

  7. SNMP agent Management Information Base SNMP Prortocol Engine response request Components of SNMP agent • Protocol engine : processing request from SNMP managers • receving request • decoding • servicing the request • sending response • Management Information Base (MIB) : collection of managed objects • each object is a data variable • standardized across system of a particular class

  8. MIB objects • Each managed object has a unique identifier, called an MIB object identifier used forreferencing an MIB object • ALL SNMP standards agents are required to support a standard set of managed objects • every MIB objects has an MIB definition that defines the managed object • MIB definitions are created using Abstract Syntax Notation One (ASN.1) • ASN.1 is a machine-independence data description (initially developed for use in OSI) • Only a subset of ASN.1 is used for SNMP • Rules for writing MIB definitions using ASN.1 are defined in Structure of Management Information (SMI)

  9. SNMP protocol

  10. SNMP operations • Get Request • Get Next Request • Get Response • Set Request • Trap

  11. Variable binding • Each SNMP variable binding consists of a variable called obkject identifier (OID) and associated value Object identifier Object value

  12. MIB Tree • Structure for referenceOID

  13. ASN.1 Notation sysContact OBJECT-TYPE SYNTAX DisplayString (SIZE (0..255)) ACCESS read-write STATUS mandatory DESCRIPTION "The textual identification of the contact person for this managed node, together with information on how to contact this person." ::= { system 4 } syscontact OID = 1.3.6.1.2.1.1.4 = iso.org.dod.internet.mgmt.mib-2.system.sycontact

  14. Basic Encoding Rule • Each field is encoded by BER Tag Length Contents • Tag : variable type • Length : length of contents • Contents : encoded data

  15. Encoding example • get request 1.3.6.1.2.1.1.1.0 30 27 sequence of 39 bytes 02 01 00 version 1 04 06 73 23 6E 6D 70 21 6 bytes of community string = #SNMP! A0 1B request of 25 bytes 02 04 23 41 3D 3E id =591478078 02 01 00 error status =0 02 01 00 error index=0 30 0E sequence of length 14 bytes 30 0C sequence of length of 12 bytes 06 08 2B 06 01 02 01 01 01 01 00 object id of 8 bytes 1.3.6.1.2.1.1.1.0 05 00 null of 0 bytes Version community str. PDU type request ID error status error index variable binding

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