IBM Enterprise Console manual Determining the OVsnmpEventOpen Filter Value, OpenView Adapter

on the adapter in proportion to the number of events discarded by the NNM circuit settings and therefore not forwarded to the adapter. If you are running NNM 5 or earlier, the adapter calls OVsnmpTrapOpen to open a session; with NNM 6 or later, the adapter calls OVsnmpEventOpen. Only OVsnmpEventOpen allows for event correlation of the events before they are forwarded to the adapter.

OVsnmpEventOpen contains a filter parameter that defines which events the application receives from ovspmd. A filter value of NULL or the empty string (“”) prevents the adapter from receiving any events and makes the session a send-only session; therefore, this is not a recommended configuration. See the manual page for OVsnmpEventOpen for more information.

The configuration file keyword HPOVFilter passes the filter value you specify to OVsnmpEventOpen. HPOVFilter specifies what kind of events are forwarded to the adapter from ovspmd and contains the value that will be used for the filter parameter when calling the OVsnmpEventOpen API. If you have NNM 6 and HPOVFilter is not specified or is commented out, the adapter receives all events by default. For more information about HPOVFilter, see “Configuration File” on page 70.

Determining the OVsnmpEventOpen Filter Value

The following examples show two ways to see how the value in HPOVFilter is passed to OVsnmpEventOpen.

vExample 1: NNM input event tracing is turned on and adapter tracing is turned off.

Look in the file $OV_LOG/ecs/<ecs-instance#>/ecsin.evt#and do a find on previous tecad_hpov from the bottom of the file. The following example is similar to what you can see (the filter in this example is {CORR{default}} .*):

Trap-PDU {

enterprise {1 3 6 1 4 1 11 2 17 1}, agent-addr internet : "\x92T$\057", generic-trap 6,

specific-trap 59179056, time-stamp 0, variable-bindings {

{

name {1 3 6 1 4 1 11 2 17 2 1 0}, value simple : number : 14

},

{
name {1 3 6	1 4 1 11 2 17	2	7	0},
value simple : string : \				"{CORR{default}} .*"
},
{
name {1 3 6	1 4 1 11 2 17	2	9	0},

value application-wide : address : internet : "\x92T$\057"

},

{

name {1 3 6 1 4 1 11 2 17 2 8 0}, value simple : string : "tecad_hpov"

},

{

name {1 3 6 1 4 1 11 2 17 2 10 0}, value simple : number : 14128

}

}

}

% ber:Trap-PDU:

Chapter 5. OpenView Adapter 67