Hi Dave,
Thanks for the reply.
As per my understanding in the agent, Agent should first
receive the response and after that it should verify with the session list.
First we should recive the response and after we should check the
outstanding sessions list, i.e the for loop in the snmp_read() API
should be after FD checking and receiving a response from the manager
(present in _sess_read() API), because second time in for loop fdset
fails because no fd's were presently set. So first inform request will
not be removed from session list and it will be retransmitted after timeout.
Regards,
Venki.
Dave Shield wrote:
On 4 November 2011 06:08, Venki <venkatesh...@globaledgesoft.com> wrote:
Inform response/Get or set Request will be handled as explained below in
SNMPv3 Mode.
Are you telling us about behaviour that you have actually seen,
or asking how the agent works?
Problem is that if multiple informs(say minimum 2) are sent and Agent
has not received response for the first SNMP inform request before sending
second inform, but after sometimes it receives a response and and verify
the message id and request id, It will not match that request id
Yes it will.
because,
the latest session conatins second inform request details not the first one.
What makes you think that the session structure only contains information
about a single outstanding request?
If you look at the code(e.g. at the end of the routine _sess_async_send in
snmplib/snmp_api.c), you will see that the session contains a *list* of
requests for which it expects a response.
So when the response arrives, the agent will search this list for the
matching request, and process that.
It is quite common for an SNMP application (agent or management client)
to have more than one request outstanding, with no guarantee as to the
order in which responses will arrive. There's no question that the library
needs to be able to handle this (and done for over ten years)
Dave
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