Chapter 9 Network Management
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1 Chapter 9 Network Management A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: If you use these slides (e.g., in a class) in substantially unaltered form, that you mention their source (after all, we d like people to use our book!) If you post any slides in substantially unaltered form on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Computer Networking: A Top Down Approach, 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July Thanks and enjoy! JFK/KWR All material copyright J.F Kurose and K.W. Ross, All Rights Reserved Network Management 9-1
2 Chapter 9: Network Management Chapter goals: introduction to network management motivation major components Internet network management framework MIB: management information base SMI: data definition language SNMP: protocol for network management security and administration presentation services: ASN.1 Network Management 9-2
3 Chapter 9 outline What is network management? Internet-standard management framework Structure of Management Information: SMI Management Information Base: MIB SNMP Protocol Operations and Transport Mappings Security and Administration ASN.1 Network Management 9-3
4 What is network management? autonomous systems (aka network ): 100s or 1000s of interacting hardware/software components other complex systems requiring monitoring, control: jet airplane nuclear power plant others? "Network management includes the deployment, integration and coordination of the hardware, software, and human elements to monitor, test, poll, configure, analyze, evaluate, and control the network and element resources to meet the real-time, operational performance, and Quality of Service requirements at a reasonable cost." Network Management 9-4
5 Infrastructure for network management definitions: managing entity managing entity data network management protocol agent agent data managed device data managed device managed devices contain managed objects whose data is gathered into a Management Information Base (MIB) agent data managed device agent data managed device Network Management 9-5
6 Network Management standards OSI CMIP Common Management Information Protocol designed 1980 s: the unifying net management standard too slowly standardized SNMP: Simple Network Management Protocol Internet roots (SGMP) started simple deployed, adopted rapidly growth: size, complexity currently: SNMP V3 de facto network management standard Network Management 9-6
7 Chapter 9 outline What is network management? Internet-standard management framework Structure of Management Information: SMI Management Information Base: MIB SNMP Protocol Operations and Transport Mappings Security and Administration ASN.1 Network Management 9-7
8 SNMP overview: 4 key parts Management information base (MIB): distributed information store of network management data Structure of Management Information (SMI): data definition language for MIB objects SNMP protocol convey manager<->managed object info, commands security, administration capabilities major addition in SNMPv3 Network Management 9-8
9 SMI: data definition language Purpose: syntax, semantics of management data welldefined, unambiguous base data types: straightforward, boring OBJECT-TYPE data type, status, semantics of managed object MODULE-IDENTITY groups related objects into MIB module Basic Data Types INTEGER Integer32 Unsigned32 OCTET STRING OBJECT IDENTIFIED IPaddress Counter32 Counter64 Guage32 Time Ticks Opaque Network Management 9-9
10 SNMP MIB MIB module specified via SMI MODULE-IDENTITY (100 standardized MIBs, more vendor-specific) MODULE OBJECT TYPE: OBJECT TYPE: OBJECT TYPE: objects specified via SMI OBJECT-TYPE construct Network Management 9-10
11 SMI: Object, module examples OBJECT-TYPE: ipindelivers ipindelivers OBJECT TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION The total number of input datagrams successfully delivered to IP userprotocols (including ICMP) ::= { ip 9} MODULE-IDENTITY: ipmib ipmib MODULE-IDENTITY LAST-UPDATED Z ORGANZATION IETF SNPv2 Working Group CONTACT-INFO Keith McCloghrie DESCRIPTION The MIB module for managing IP and ICMP implementations, but excluding their management of IP routes. REVISION Z ::= {mib-2 48} Network Management 9-11
12 MIB example: UDP module Object ID Name Type Comments UDPInDatagrams Counter32 total # datagrams delivered at this node UDPNoPorts Counter32 # underliverable datagrams no app at portl UDInErrors Counter32 # undeliverable datagrams all other reasons UDPOutDatagrams Counter32 # datagrams sent udptable SEQUENCE one entry for each port in use by app, gives port # and IP address Network Management 9-12
13 SNMP Naming question: how to name every possible standard object (protocol, data, more..) in every possible network standard?? answer: ISO Object Identifier tree: hierarchical naming of all objects each branchpoint has name, number ISO ISO-ident. Org. US DoD Internet udpindatagrams UDP MIB2 management Network Management 9-13
14 OSI Object Identifier Tree Check out Network Management 9-14
15 SNMP protocol Two ways to convey MIB info, commands: request managing entity response agent data managing entity trap msg agent data Managed device request/response mode Managed device trap mode Network Management 9-15
16 SNMP protocol: message types Message type GetRequest GetNextRequest GetBulkRequest InformRequest SetRequest Response Trap Function Mgr-to-agent: get me data (instance,next in list, block) Mgr-to-Mgr: here s MIB value Mgr-to-agent: set MIB value Agent-to-mgr: value, response to Request Agent-to-mgr: inform manager of exceptional event Network Management 9-16
17 SNMP protocol: message formats Network Management 9-17
18 SNMP security and administration encryption: DES-encrypt SNMP message authentication: compute, send MIC(m,k): compute hash (MIC) over message (m), secret shared key (k) protection against playback: use nonce view-based access control SNMP entity maintains database of access rights, policies for various users database itself accessible as managed object! Network Management 9-18
19 Chapter 9 outline What is network management? Internet-standard management framework Structure of Management Information: SMI Management Information Base: MIB SNMP Protocol Operations and Transport Mappings Security and Administration The presentation problem: ASN.1 Network Management 9-19
20 The presentation problem Q: does perfect memory-to-memory copy solve the communication problem? A: not always! struct { char code; int x; } test; test.x = 256; test.code= a test.code test.x a host 1 format test.code test.x a host 2 format problem: different data format, storage conventions Network Management 9-20
21 A real-life presentation problem: grandma 2007 teenager aging 60 s hippie Network Management 9-21
22 Presentation problem: potential solutions 1. Sender learns receiver s format. Sender translates into receiver s format. Sender sends. real-world analogy? pros and cons? 2. Sender sends. Receiver learns sender s format. Receiver translate into receiver-local format real-world-analogy pros and cons? 3. Sender translates host-independent format. Sends. Receiver translates to receiver-local format. real-world analogy? pros and cons? Network Management 9-22
23 Solving the presentation problem 1. Translate local-host format to host-independent format 2. Transmit data in host-independent format 3. Translate host-independent format to remote-host format grandma aging 60 s hippie 2007 teenager Network Management 9-23
24 ASN.1: Abstract Syntax Notation 1 ISO standard X.680 used extensively in Internet like eating vegetables, knowing this good for you! defined data types, object constructors like SMI BER: Basic Encoding Rules specify how ASN.1-defined data objects to be transmitted each transmitted object has Type, Length, Value (TLV) encoding Network Management 9-24
25 TLV Encoding Idea: transmitted data is self-identifying T: data type, one of ASN.1-defined types L: length of data in bytes V: value of data, encoded according to ASN.1 standard Tag Value Type Boolean Integer Bitstring Octet string Null Object Identifier Real Network Management 9-25
26 TLV encoding: example Value, 259 Length, 2 bytes Type=2, integer Value, 5 octets (chars) Length, 5 bytes Type=4, octet string Network Management 9-26
27 Network Management: summary network management extremely important: 80% of network cost ASN.1 for data description SNMP protocol as a tool for conveying information Network management: more art than science what to measure/monitor how to respond to failures? alarm correlation/filtering? Network Management 9-27
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