1 00:00:00,450 --> 00:00:09,510 It's very important that you understand maps or management information bases or I.D. or object identifiers 2 00:00:10,080 --> 00:00:16,170 and performance counters within your role as a network manager and also in working with network management 3 00:00:16,170 --> 00:00:17,590 applications. 4 00:00:17,880 --> 00:00:23,270 With regards to understanding network protocols there are three key terms to understand. 5 00:00:23,370 --> 00:00:26,300 Firstly maps or management information bases. 6 00:00:26,790 --> 00:00:33,380 Secondly OJD or object identifiers and performance counters or PERF Mohn. 7 00:00:33,480 --> 00:00:40,820 Now in a lot of conversations network engineers use that term map and OED interchangeably. 8 00:00:40,860 --> 00:00:43,730 However it's important to make a distinction. 9 00:00:43,980 --> 00:00:51,860 A Meb is a larger entity than an I.D. and an I.D. is included within a mob. 10 00:00:51,930 --> 00:01:00,390 A mob is a database used for managing entities in a network using protocol such as S and P objects in 11 00:01:00,390 --> 00:01:08,970 the mob are defined using abstract syntax notation or SSN and the database is structured as a hierarchical 12 00:01:08,970 --> 00:01:11,220 database or tree structure. 13 00:01:11,250 --> 00:01:20,370 Each entry in the mob is addressed through an I.D. So as an example if a network manufacturer wanted 14 00:01:20,370 --> 00:01:26,850 to create a mob for pulling environmental statistics on a rota the writer manufacturer would include 15 00:01:26,850 --> 00:01:33,210 a mob with many different types of variables and statistics which would give you a total view of that 16 00:01:33,210 --> 00:01:41,250 type of statistic for the device was an I.D. would be used for polling a specific interfaces an example 17 00:01:41,850 --> 00:01:47,520 with a specific object identifier and that's where the term I.D. comes from. 18 00:01:47,550 --> 00:01:54,330 Here's an Irish Odyssey discussing the management information base or mob for network management of 19 00:01:54,330 --> 00:01:56,730 DCP IP based internets. 20 00:01:56,940 --> 00:02:07,140 This Irish Sea obsolete or if sea level 58 and it defines the second version of the mob to for use with 21 00:02:07,140 --> 00:02:11,410 network management protocols in a TCB IP network. 22 00:02:11,640 --> 00:02:19,440 The RF she explains in a lot of detail about some of the groups that are available in them including 23 00:02:19,440 --> 00:02:26,190 as an example the system group this contains four objects which will often see in network management 24 00:02:26,190 --> 00:02:33,960 environments CIS contact CIS name CIS location and CIS services and thus provides contact administrative 25 00:02:34,320 --> 00:02:41,070 information regarding the managed node interfaces group contains information about interfaces as an 26 00:02:41,070 --> 00:02:42,300 example. 27 00:02:42,310 --> 00:02:48,170 Now you know why shock capture information was being sent back from a managed device. 28 00:02:48,390 --> 00:02:55,230 In this case right to to the network management station and notice it includes information such as Wonder 29 00:02:55,250 --> 00:03:04,920 three or six to one or two and so forth doing a search in this RF seem to we can see information with 30 00:03:04,920 --> 00:03:12,270 that hierarchy of values one or three to six that wandered for as an example in the obsolete ID version 31 00:03:13,270 --> 00:03:22,060 of this RF C so the one that this or if C replaced we could search for information and it would include 32 00:03:22,060 --> 00:03:30,210 information such as this ISO organization Deo D Internet management system system descriptor. 33 00:03:30,490 --> 00:03:39,190 So this is appended to an instance sub identifier of 0 a value like this indicates system descriptor. 34 00:03:39,190 --> 00:03:52,730 So in this example notice the hierarchy 1 3 6 1 2 1 and then it changes to other values 2 to now it's 35 00:03:52,730 --> 00:03:56,860 very difficult to look for information in an RFP such as this. 36 00:03:57,200 --> 00:04:04,370 So it's easier to look at a browser for specific Meb or I.D. information so rather than trying to work 37 00:04:04,370 --> 00:04:08,900 this out you could use a map browser to see what this actually means.