I think another reason for UDP is the smal SNMP payloads that can fit in one UDP transaction
such that the communication is truely message oriented and atomic.


Dave Shield wrote:

On Wed, 2005-04-06 at 08:33, Soori wrote:


In every SNMP document it is stated that SNMP uses UDP
as transport. Can any body tell me is there any
specific reason to use SNMP over UDP and not TCP ?



As well as the question of behaviour in a failing network, that baskeböler mentions, there's another issue to consider.

When SNMP was first being developed, one of the aims was
to make it as lightweight as possible, so that it could
safely be included within embedded systems where processing
resources might be at a premium.  UDP is a significantly
simpler protocol than TCP, so it was felt this could result
in a smaller implementation footprint.

With the explosion in processing power, such concerns are
now much less important.

Currently, the most important reason for running SNMP over
UDP, is that this is the accepted standard arrangement. The
whole point of network management is to be able to talk to
a wide variety of networked kit.  There's not much point
in choosing a different transport, if half your boxes don't
support it!




I think Net-SNMP supports both TCP and UDP.



Correct.

As far as the basic SNMP protocol is concerned, it doesn't
actually care *what* transport is used.  The transport is
there to get a message from A to B.  As long as the request
gets there (and the response gets back again), you could
run SNMP over Secret-Decoder-Ring if you really wanted to :-)

Net-SNMP implements a modular transport mechanism, so can
support a variety of different transports (take a bow, John).
These include UDP and TCP over both IPv4 and IPv6,  IPX,
AAL5, and local callbacks.  None of this affects the basic
operation of the agent or client tools.

But if you want to manage other kit, you must use transport
mechanisms that they support.

Dave



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