Re: How to handle the netSnmpEnterprise entry?

Thanks for the swift reply!

Is it impossible to use the public API to send a clean SNMP v2 trap?

When calling the function send_v2trap for a generic trap (like linkDown,
1.3.6.1.6.3.1.1.5.3) I get an netSnmpEnterprise binding.
According to the docs:
"Uses the supplied list of variable bindings to form an SNMPv2 trap,
which is sent to SNMPv2-capable sinks on the configured list."
To me this means it should not add 'netSnmpEnterprise' binding since I'm
creating a v2 trap (and according to the last 'Yes' answer I got below).

On the other hand the function docs also states:
"This function eventually calls send_enterprise_trap_vars. If the trap
type is not set to SNMP_TRAP_ENTERPRISESPECIFIC the enterprise and
enterprise_length paramater is set to the pre defined NETSNMP_SYSTEM_MIB
oid and length respectively. If the trap type is set to
SNMP_TRAP_ENTERPRISESPECIFIC the enterprise and enterprise_length
parameters are set to the pre-defined NETSNMP_NOTIFICATION_MIB oid and
length respectively."
To me this means that there is no way to create a trap without the
'netSnmpEnterprise' binding using this function.

Also, should generic traps (like linkDown, 1.3.6.1.6.3.1.1.5.3) and
enterprise specific traps be handled differently?
In v2 I thought they should be handled in a more uniform manner.

I feel quite confused. Can anyone shed som light on this?


Thanks!
/Thomas

On Mon, 2009-10-05 at 14:23 +0100, Dave Shield wrote:
> 2009/10/5 Thomas Eliasson <[email protected]>:
> > I can't find any specification supporting the statement:
> > "snmp_v2trap tries to add all the important parts of a message that are
> > required before it goes out, hence the reason it needs to add the
> > enterprise.  It's required by the SNMPv2c protocol!"
> >
> > Where do I find this information?
> 
> See RFC 3584.
> In particular - section 3.1 covers mapping from SNMPv1 traps
> to SNMPv2 notifications.   (Which is the context where
> snmpTrapEnterprise is used).
> 
> 
> 
> > Also I cannot find information on what value to set.
> > According to the RFC 3418:
> > "The authoritative identification of the enterprise
> > associated with the trap currently being sent.  When an
> > SNMP proxy agent is mapping an RFC1157 Trap-PDU
> > into a SNMPv2-Trap-PDU, this variable occurs as the
> > last varbind."
> > This does tell me much. Is it supposed to contain the OID "...private.enterprises.X"?
> > Should the value ONLY be set if an RFC1157 to SNMPv2 mapping is done?
> 
> Yes.
> 
> Dave
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