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Simple Network Management Protocol SNMP - swati13 - 08-16-2017 [attachment=14187] SNMP (Simple Network Management Protocol) SNMP Overview Define mechanism for remote management of network devices (routers, bridges, etc.) Fundamental principle: all device management done by simple variable value manipulation Approach: standard means for specifying quantities recognized by devices protocol for requesting, returning, notifying of changes of values SNMP Message Protocol Messages use UDP, ports 161 (requests/responses) and 162 (notifications) Message types: GetRequest: request values of variables from device GetNextRequest: request value of variable following the one supplied GetResponse: return values SetRequest: instruct device to set values of variables Trap: from device - notify monitor / manager of value change SNMP Communities Define communities specifying access to specific variable sets (read-write, read only, none) Supply community name as password in each message unencrypted in version of SNMP still widely used!! SNMP Message Encoding Encode message as byte stream using ASN.1 BER (Abstract Syntax Notation 1 Basic Encoding Rules) Quantites encoded as Type,Length,Value triples Types Subset of basic ASN.1 types used in SNMP: integer, octet string, object identifier ( variable name ), sequence SNMP-defined types: gauge, counter, IP address, etc. Values weirdly encoded!! (see ASN.1 specs) SNMP SMI (Structure of Management Information) Variables recognized by device supplied in MIB (Management Information Base) text file giving variables and data structures defined using ASN.1 standard variable sets often provided as RFC s device-specific sets provided by vendors Management stations parse MIB s to determine variables available for management obtain both data structure and management information Example portion of MIB (from RFC 1213) ASN.1 Object Identifiers Variables identified by globally unique strings of digits ex: 1.3.6.1.4.1.3.5.1.1 name space is hierarchical; tree on next slide in above, 1 stands for iso, 3 stands for org, 6 stands for dod, 1 stands for internet, 4 stands for private, etc. Variable names are aliases for digit strings (within MIB) From previous page: ifNumber ::= { interfaces 1 } interfaces was previously defined in MIB as 1.3.6.1.2.1.2, so ifNumber = 1.3.6.1.2.1.2.1 Partial ASN.1 Object Identifier Tree (from: ASN.1 Complete, J. Larmouth, Open Systems Solutions, 1999) Application: GICL SNMP Monitor Java-based SNMP application Query devices for available MIB variables Set desired variable values Current status retrieve and display all values from device automatically build data structures to hold retrieved values Future work incorporate MIB information via MIB parser auto-generate GUI display implement device discovery Simple Network Management Protocol SNMP - abhilipsaparida - 08-16-2017 SNMP Introduction: Simple Network Management Protocol (SNMP) is a UDP-based network protocol. It is used mostly in network management systems to monitor network-attached devices for conditions that warrant administrative attention. SNMP is a component of the Internet Protocol Suite as defined by the Internet Engineering Task Force (IETF). It consists of a set of standards for network management, including an application layer protocol, a database schema, and a set of data objects.[1] SNMP is part of the Internet network management architecture. SNMP exposes management data in the form of variables on the managed systems, which describe the system configuration. These variables can then be queried (and sometimes set) by managing applications. Agenda to be discussed SNMP Architecture Goals of Architecture Motivation Five basic messages Message Information Base Transport Protocol Tools use SNMP SNMP advantages/disadvantages Category: Computer Networks Submitted By: Name: L. Manasa Semester: 7th Semester Telecommunication Vivekananda Institute of Technology. Simple Network Management Protocol SNMP - rajat - 08-16-2017 to get information about the topic "Simple Network Management Protocol" full report ppt and related topic refer the page link bellow http://seminarsprojects.net/Thread-simple-network-management-protocol-snmp-full-report http://seminarsprojects.net/Thread-simple-network-management-protocol-snmp |