It's very important that you understand maps or management information bases or I.D. or object identifiers
and performance counters within your role as a network manager and also in working with network management
applications.
With regards to understanding network protocols there are three key terms to understand.
Firstly maps or management information bases.
Secondly OJD or object identifiers and performance counters or PERF Mohn.
Now in a lot of conversations network engineers use that term map and OED interchangeably.
However it's important to make a distinction.
A Meb is a larger entity than an I.D. and an I.D. is included within a mob.
A mob is a database used for managing entities in a network using protocol such as S and P objects in
the mob are defined using abstract syntax notation or SSN and the database is structured as a hierarchical
database or tree structure.
Each entry in the mob is addressed through an I.D. So as an example if a network manufacturer wanted
to create a mob for pulling environmental statistics on a rota the writer manufacturer would include
a mob with many different types of variables and statistics which would give you a total view of that
type of statistic for the device was an I.D. would be used for polling a specific interfaces an example
with a specific object identifier and that's where the term I.D. comes from.
Here's an Irish Odyssey discussing the management information base or mob for network management of
DCP IP based internets.
This Irish Sea obsolete or if sea level 58 and it defines the second version of the mob to for use with
network management protocols in a TCB IP network.
The RF she explains in a lot of detail about some of the groups that are available in them including
as an example the system group this contains four objects which will often see in network management
environments CIS contact CIS name CIS location and CIS services and thus provides contact administrative
information regarding the managed node interfaces group contains information about interfaces as an
example.
Now you know why shock capture information was being sent back from a managed device.
In this case right to to the network management station and notice it includes information such as Wonder
three or six to one or two and so forth doing a search in this RF seem to we can see information with
that hierarchy of values one or three to six that wandered for as an example in the obsolete ID version
of this RF C so the one that this or if C replaced we could search for information and it would include
information such as this ISO organization Deo D Internet management system system descriptor.
So this is appended to an instance sub identifier of 0 a value like this indicates system descriptor.
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
very difficult to look for information in an RFP such as this.
So it's easier to look at a browser for specific Meb or I.D. information so rather than trying to work
this out you could use a map browser to see what this actually means.