Re: trap format confusion

On Thu, 2005-12-15 at 20:41 +0100, Berge, Harry ten wrote:
> In a v1 trap pdu I've got (among others) fields like 'enterprise oid',
> 'generic trap', 'enterprise trap' and so on.
 
So the format of this particular PDU is completely different from
any of the others.  This was seen as a Bad Thing.

 
> But now I've got an v2c trap. It has only variable bindings,

plus the usual header information - yes.
The format of this particular PDU is now basically the same as
all of the others.  This is seen as a Good Thing.

>                                                     and the
> difference between generic trap and enterprise trap is gone.

Correct.
This doesn't affect what notifications can be reported, but
the same mechanism is used to represent *all* traps - regardless
of whether they are "standard" ones or not.

There is now a single value to consider (in the second varbind)
when deciding which notification is being sent.  With SNMPv1,
this involved checking three distinct values.

For the core generic traps, the old approach was probably
slightly easier.  But having a single mechanism is definitely
simpler overall.


>  When are v1 traps used and when v2c traps?

v1 traps are used when you're using SNMPv1.
v2 traps (and informs) are used when you're
   using SNMPv2c or SNMPv3.

The information that is carried is the same in either
case - it's just organised slightly differently.

Note that the PDU format is better described as SNMPv2
(not SNMPv2c), as this is used for both SNMPv2c and SNMPv3
requests.
  The differences between SNMPv2c and SNMPv3 formats are
purely concerned with the administrative header settings,
that comes *before* the main PDU information, which is
the same for both versions.


Dave


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