SNMP over UART (AgentX protocol)

Dear Sir!

YC> We have Linux installed on PowerPC platform, and SNMP agent working on
YC> it. It is necessary to pass SNMP requests from the SNMP agent over,
YC> for example, ttyS0 device, to small ARM-based system. Is it possible
YC> using AgentX technique or somehow else? Of course, I can communicate
YC> with the ARM from subagent procedure, which is called every time when
YC> SNMP request is coming. But PowerPC SNMP agent knows very few about
YC> contents of ARM MIB. Moreover, another ARM system can have different
YC> MIB tree.

Thanks to:

Wes Hardaker <hardaker@users.sourceforge.net>
>Typically most implementations would use a different protocol to pull
>the data over the serial line and sort it properly in the master agent
>rather than use something like AgentX directly over the serial line.
>This is typically because doing agentx processing isn't cheap since
>proper SNMP sorting of the data must be done and I doubt the process you
>have running on the other side of the serial device is running on a fast
>processor.

Daniel Lacey <daniel_p_lacey@yahoo.com>
>I would run PPP over the serial link if you can.
>That way, you have an IP network connection, and do not need to change
>anything in net-snmp.

Running some OS with TCP/IP stack at microcontroller's side is really
quite heavy decision in this application. Standing on mentioned above
replies I have another solution:
- during system start-up it is necessary to collect information about
device's MIB tree, using some simple protocol
- before starting subagent on the PowerPC processor, construct
corresponding MIB structure
- register subagent, passing pointer to the MIB array
And than you can communicate with the device using own protocol,
as advised above.

Sincerely yours
Yuriy Coureelo
------------------------
Embedded Software Engineer
Telecommunication Equipment Division
Micran Company
Tomsk, Russia


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