Re: What is the Callback transport?

On Tue, 2006-01-17 at 15:45 +0200, Makavy, Erez (Erez) wrote:

> 2) Is it net-snmp transport?

Yes.
It's a sort-of "internal loopback" mechanism,
whereby the agent can re-query itself to retrieve
(?or update?) another MIB instance value, without
actually having to build-and-parse an SNMP request
packet, or send it over the network.


> 3) Do sub-agents by default ... use the callback transport?

I don't think so.
AFAIK, the main place this is used in in the DisMan
Event-MIB module, to retrieve the values being monitored,
or the payload for notifications sent.



> 4) How is interprocess communication achieved with
>    the callback transport?

It's not concerned with inter-process communication.
This is used for *intra*-process communication - i.e.
communication within a single (agent) process.


> 5) Where can I read about?

Use the source, Luke :-)

I don't believe this is documented anywhere
(though last time I said that, I was promptly
corrected.   Watch that space....)

Dave


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