Re: concept like "container" and "helpers"

Fair enough,

But what happen when the "subsystem" data is updated ?

How agent table "Container" Data structure will be updated ?

What about the "memory Consumption", We are maintaining the two data
structure for the same DATA

what exactly meant by the "subsystem" ?

Thanks and Best Regards,
Sanjay kumar

Dave Shield wrote:

2009/4/9 sanjaykumar <[email protected]> :

Net-snmp introduce the some of the concept like
"container" and "helpers" in latest version.
I am really struggling to get HOLD on these concepts.

Ok - I'll have a stab.

Let's take "container" first.
Typically, a significant proportion of the information
supplied by an SNMP agent will be in form of tables.
Most of these tables will be reporting information from
somewhere outside the agent itself - a "subsystem".

The agent has to have some way of getting this information
from the subsystem, so it can report back to the management
application. One way is to contact the subsystem every time
a request comes in, retrieve the single item of information that
has been requested, and return that. But this can be somewhat
inefficient - particularly when processing GETNEXT requests.

A very common alternative approach is to hold a local copy of
the whole of this information within the agent itself. That can
then be used to service SNMP requests relatively efficiently.

But in order to do this, the agent needs some way to hold
this local copy of the table. The "container" is a standard
mechanism for doing this. It's effectively a data structure
that contains the various rows of the table (including how
they are indexed).

So whenever you see "container" - think "internal table".
(It's not quite as simple as that, but it's close enough)

OK so far?

Dave

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