>>>>> On Mon, 13 Feb 2006 06:42:16 +0000 (GMT), Raja Sekhar <[EMAIL PROTECTED]>
>>>>> said:
Raja> i am new to net snmp. i have down loaded the
Raja> net-snmp-5.3.0.1-1.EL4.i386 current version from the site. i
Raja> have installed it in linux and i am able to run the snmpd
Raja> successfully. But the real problem is that i am not able to
Raja> understand how to add a MIB which is created by me. can any one
Raja> explain me how to add a mib to the agent and compile it and
Raja> generate the agent only with that mib.
How do I add a MIB to the agent?
-------------------------------
How do I add functionality?
--------------------------
While simply adding a file to the MIB directory (and possibly tweaking
the list of MIBs to load) is sufficient for the tools, unfortunately
extending the functionality of the agent to include this is not so simple.
In fact, the agent makes little or no use of these files, and will work
quite happily without them. All the information about the syntax and
scope of the variables supported is hardwired into the implementation
of the agent.
There are a number of alternative ways to add functionality for a new
MIB to the agent.
Firstly, it is possible that the agent distribution already includes
the desired functionality, but this has simply not been configured in
to the running version. This is done using the configure option
--with-mib-modules="list"
(where "list" is a space-separated list of modules to include) then
recompiling the agent.
Note that some functionality concerned with monitoring and managing
unix hosts is included in the UCD extension modules, which are located
within the 'private' branch of the MIB tree. This is covered in a later
question in this FAQ.
Secondly, it is possible for the agent to run commands or shell scripts
in response to queries. These can obtain and report the necessary
information, or perform actions as required.
Detailed information and examples are provided in the snmpd(8) and
snmpd.conf(5) manual pages, and the EXAMPLE.conf file.
This is known as "pass-through" support.
Thirdly, it may be possible to link another agent (which already
supports the desired MIB), as a "subagent" of the Net-SNMP master
(or vice versa). The possibilities here are SMUX, AgentX or proxied
SNMP (see the next question but one).
Finally, the agent itself can be extended to support additional MIB
groups, by writing the necessary C code, and including this within
the main agent - either statically compiled in, or dynamically loaded.
This is covered further in the next section.
Note that there is no visible difference between 'pass-through'
MIB support, subagents, and modules implemented within the main agent
itself. Tools querying the agent will see a single MIB structure.
--
Wes Hardaker
Sparta, Inc.
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