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Chapter 7 Overview

Chapter 7 Overview. Structure of management info (SMI) Definition of mib-2 objects Use of MIB browser MIB compiler MIB editor. Intro. In Chapter 6, we looked at SMI tree Here, interested in mib-2 branch On mib-2 branch There is an almost endless number of things that could be monitored

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Chapter 7 Overview

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  1. Chapter 7 Overview • Structure of management info (SMI) • Definition of mib-2 objects • Use of MIB browser • MIB compiler • MIB editor Chapter 7  Management Information Base (MIB) 1

  2. Intro • In Chapter 6, we looked at SMI tree • Here, interested in mib-2 branch • On mib-2 branch • There is an almost endless number of things that could be monitored • But don’t want performance to suffer • Therefore, mib-2 is limited Chapter 7  Management Information Base (MIB) 2

  3. SMI • We’re interested in nodes under iso (1) • Internet is under DoD (DoD funded ARPA) • Internet node now administered by IAB • All mib-2 objects under iso.org.dod.internet.mgmt.mib-2, or, equivalently, 1.3.6.1.2.1 Chapter 7  Management Information Base (MIB) 3

  4. iso (1) • standard (0) has a node for each approved “international standard” • registration-authority (1) is reserved for OSI registration authorities • member-body (2) has node for each country in ISO/IEC • identified-organization (3) has node for “any organization that can justify it” • Currently only NIST and DoD Chapter 7  Management Information Base (MIB) 4

  5. dod (6) • Under dod (6), there is only internet (1) • Under internet (1) • directory (1) for DoD services • management (2) for nodes defined in RFCs (administered by IANA) • experimental (3) administered by IANA • private (4), enterprise (1) for proprietary MIBs Chapter 7  Management Information Base (MIB) 5

  6. management (2) • mib-2 (1) contains MIB II objects • mib-2 is the focus of this chapter • MIB objects specified with subset of ASN.1 • Subset used is minimum required • Consistent with SNMP approach (keep it simple) • More details on ASN.1 in Appendix B • Lots of other sources of info available • ASN.1 is like a programming language Chapter 7  Management Information Base (MIB) 6

  7. MIB Objects • Object-Type Macro • Written in ASN.1 • Acts as a template for constructing MIB objects • Each line is a clause • Almost all mib-2 objects created from these clauses • Exceptions are… • …ReferPart and DefValPart Chapter 7  Management Information Base (MIB) 7

  8. sysDescr Object • sysDescr includes • SYNTAX • ACCESS • STATUS • DESCRIPTION • value Chapter 7  Management Information Base (MIB) 8

  9. sysDescr Object • Anything following “” is a comment • system 1 is node 1 under “system” in SMI tree • system is at • 1.3.6.1.2.1.1 • So, system 1 is at • 1.3.6.1.2.1.1.1 Chapter 7  Management Information Base (MIB) 9

  10. sysName • What info does sysName provide? • Node’s domain name • Where does sysName live in SMI tree? • Recall, system is at • 1.3.6.1.2.1.1 • So system 5 is at • 1.3.6.1.2.1.1.5 Chapter 7  Management Information Base (MIB) 10

  11. ipAddrTable • Let’s consider a more complex object definition • Consider ipAddrTable • 4 columns • 1 row for each interface Chapter 7  Management Information Base (MIB) 11

  12. ipAddrTable • Each entry (row) in table has object identifier ipAddrEntry, mib-2.4.20.1 • E.g., object identifier of object in column ipAdEntNetMask is mib-2.4.20.1.3 • Index object is ipAdEntAddr (from 1 to N) • ipAdEntBcastAddr for interface 2 is at • mib-2.4.20.1.4.2 • ipAdEntNetMask for interface 4 is at • mib-2.4.20.1.3.4 Chapter 7  Management Information Base (MIB) 12

  13. ipAddrTable • Uses template on previous slide Chapter 7  Management Information Base (MIB) 13

  14. ipAddrEntry • Use ipAddrTable • Note • Sequence element is a row • Value is ipAddrTable 1, i.e., mib-2.4.20.1 Chapter 7  Management Information Base (MIB) 14

  15. NMS Presentation of iso • Meterware view of iso branch • SNMP can only access leaf node • Note that IP address of WS1 is 192.192.192.223 Chapter 7  Management Information Base (MIB) 15

  16. NMS Presentation of mib-2 • Meterware view of mib-2 • Note 10 original groups • system thru snmp • 13 extensions • rmon, etc. Chapter 7  Management Information Base (MIB) 16

  17. NMS View of ipAddrTable • Meterware view of ipAdderTable Chapter 7  Management Information Base (MIB) 17

  18. NMS View of ipAddrTable • Meterware view of value in ipAdderTable • Note that ipAdEntAddr is index object Chapter 7  Management Information Base (MIB) 18

  19. WS1 ipAddrTable • ipAdEntAddr • 127.0.0.1 is loopback address on WS1 • 192.192.192.233 is IP address of NIC • ipAdEntIfIndex • 1 identifies interface 127.0.0.1 in ifTable • 2 identifies 192.192.192.233 in ifTable Chapter 7  Management Information Base (MIB) 19

  20. WS1 ipAddrTable • ipAdNetMask mask for addresses • ipAdEntBcastAdd • Indicates broadcast address • ipAdEntReasmmax Size • Max size of reassembled datagram Chapter 7  Management Information Base (MIB) 20

  21. Index Object • NMS might not know index object • Then how can NMS construct table? • To get ipAdEntNetMask column… • GetNextRequest(ipAdEntNetMask) to get ipAdEntNetMask.1 • GetNextRequest(ipAsEntNetMask.1) to get ipAdEntNetMask.2 • GetNextRequest(ipAsEntNetMask.2) to get ipAdEntBcastAddr.1, and so on… Chapter 7  Management Information Base (MIB) 21

  22. Meterware Network View • Summary view Chapter 7  Management Information Base (MIB) 22

  23. Meterware Network View • MIB browser for Switch 2 Chapter 7  Management Information Base (MIB) 23

  24. Set Command • Check ifAdminStatus of Switch2 • All 27 ports are “administratively up” • Only ports 3 and 25 are connected • Port 3 connected to SERVER • Port 25 connected to 10Base2 cable Chapter 7  Management Information Base (MIB) 24

  25. Set Command • Note that Port 3 of Switch2 connects to SERVER = port 3 Chapter 7  Management Information Base (MIB) 25

  26. Set Command • Ping SERVER (192.192.192.242) from WS1 Chapter 7  Management Information Base (MIB) 26

  27. Set Command • Set ifAdminStatus of port 3 on switch2 to “down” Chapter 7  Management Information Base (MIB) 27

  28. Set Command • Meterware shows port 3 is down • 1 == up • 2 == down Chapter 7  Management Information Base (MIB) 28

  29. Set Command • Again, ping SERVER from WS1 Chapter 7  Management Information Base (MIB) 29

  30. Enterprise MIBs • hp is node for Hewlett Packard • What, no Cisco node? Chapter 7  Management Information Base (MIB) 30

  31. Cisco Catalyst MIB Chapter 7  Management Information Base (MIB) 31

  32. Compile Cisco MIB • Compile ESSWITCH-MIB-MY2 2 1 3 Chapter 7  Management Information Base (MIB) 32

  33. Compile Cisco MIB • Compile ESSWITCH-MIB-MY2 Chapter 7  Management Information Base (MIB) 33

  34. Enterprise Node • Why “grandjunction” ? Chapter 7  Management Information Base (MIB) 34

  35. Grandjunction node • Children of “series 2000” Chapter 7  Management Information Base (MIB) 35

  36. sysInfo node • Select sysInfoNumberOfSwitchPorts… • What should we find? Chapter 7  Management Information Base (MIB) 36

  37. sysInfo node • What does this tell us? • Switch has 27 ports • Why not just count ports? • Allows for remote mgmt! Chapter 7  Management Information Base (MIB) 37

  38. MIB Editor • We have seen how to construct MIB objects as text files and compile • There are MIB editors • User-friendly editor to make correct source code • May be part of NMS or standalone Chapter 7  Management Information Base (MIB) 38

  39. Chapter 7 Summary • Formal definition of MIB objects • Syntax of ASN.1 • Simple and constructed mib-2 objects • Meterware screen shots • Compiled a MIB module • MIB editor Chapter 7  Management Information Base (MIB) 39

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