9_NetworkManagement&Security_spring10

9_NetworkManagement&Security_spring10 - TCP/IP...

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Unformatted text preview: TCP/IP Essentials A Lab-Based Approach Chapter 9 Chapter 9 Network Management Network Management & Security & Security Spring 2010 Polytechnic Institute of NYU Slide 2 zjzhao Network Management Network administrators need to Collect statistics from a device to see if it works properly (element management) Monitor network traffic load on routers to see if the load is appropriately distributed (traffic monitoring) Go through collected information to identify the cause when a network failure occurs (trouble shooting) Polytechnic Institute of NYU Slide 3 zjzhao Simple Network Management Protocol (SNMP) Simple Network Management Protocol (SNMP) is an application layer protocol for exchange management information between network devices Each Managed Device , a host or a router, maintains a number of Management Information Bases (MIBs) Each managed device has an SNMP Agent to provide interface between MIBs and an SNMP Manager An SNMP manager, usually implemented in Network Management System , can work with multiple SNMP agents Well-known UDP port number 161/162 at SNMP agent/manager Polytechnic Institute of NYU Slide 4 zjzhao SNMP Messages SNMP messages exchange information between an SNMP manager and an SNMP agent Get: fetches the value of one or more objects GetNext: fetches the value of the next object after the specified object Set: sets the value of one or more objects Response: returns the value of one or more objects Trap: reports the occurrence of some significant events in a managed device. Inform: reports the occurrence of some significant events in a managed device and requests a response from the manager. GetBulk: allows exchanging of responses with a large amount of management information. Polytechnic Institute of NYU Slide 5 zjzhao SNMP Message Formats Version Number The version of SNMP: SNMPv1,SNMPv2, SNMPv3 SNMPv2 extends SNMPv1 by defining additional operations (GetBulk, ) SNMPv3 extends SNMPv2 by adding security and remote configuration capabilities Community Name Defines the access scope for SNMP managers and agents An SNMP message carrying a different community name is discarded Protocol Data Unit (PDU) Type Specifies the SNMP message type PDU Community Version Object 1, Value 1 Error Index Object 2, Value 2 Error Status Request ID PDU Type Max. Repetitions Non Repeaters Object 1, Value 1 Object 2, Value 2 Request ID PDU Type SNMPv2 Get, GetNext, Inform, Response, Set, and Trap messages SNMPv2 GetBulk message Polytechnic Institute of NYU Slide 6 zjzhao SNMP Message Format (contd) Request ID Used to match an SNMP request with the corresponding response Error Status An integer specifying an error only set by an SNMP response Error Index An integer offset specifying which object was in error only set by an SNMP response Objects and Values A list of objects and their values PDU Community Version Object 1,...
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9_NetworkManagement&Security_spring10 - TCP/IP...

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