Re: confusion related to get requests

Dave Shield wrote:
> 2009/3/31 parveen yadav <[email protected]>:
>   
>> When i have given walk request it is extracting data from agent.
>>     
>
> Yup.
>
>   
>> during this process i have given another walk request for same table.
>>     
>
> OK
>
>   
>> since agent is returning data to for request one by one.
>> the data for other request should start coming after finish of first
>> request.
>>     
>
> No.   Why should it?
>
> Remember that it's the "snmpwalk" which is walking the table,
> not the agent.   The agent just sees a sequence of GETNEXT
> requests, which it processes individually.
>
>   
>>                But it starts immediately.
>>     
>
> That's right.
>
> The agent is still seeing a sequence of GETNEXT requests.
> It doesn't care that they are now coming from two places instead
> of one, or that the OIDs are jumping back and forth.
>       It just answers each request as it sees it.
>
>
>
>   
>> so either my table handler is called from two request handlers at same time
>> or there is some session unmaintained for each request.
>>     
>
> Remember that the agent is not simply processing two requests.
> It will be processing dozens of them - one for each entry in the table.
> So there's no problem at all in interleaving these two sets of requests.
>
>
>   
>> just a simple query but it might clear few doubts about snmp agent.
>>     
>
> It feels as if you have misunderstood how "snmpwalk" works.
> There is no "WALK" request in SNMP - just GET and GETNEXT (+)
> It's up to the "snmpwalk" command to chain GETNEXT requests
> together, in order to retrieve the whole table.
>
> Dave
>
>   (+) Please - can nobody mention GETBULK.   That will just muddy the waters!
>
>   
thanks for your quick replies. this helped a lot.

after going through all agent code from starting of request to end of it 
i am clear about request processing.

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