Interface names in instance discovery

[rgkordia]

Hi guys,

I've seen a number of posts around this topic, but I'm having trouble getting this to work. 

Problem: when I create a DCI that uses instance discovery (eg: ifInOctets) I can't seem to get the interface description into the name of the DCI.

I've tried using the %{script:xxxxx} approach in the DCI name, but I can't find out how to pass {instance} as a parameter to the script and $dci appears to not be set in the script.
I've tried using the return %(true,"<interface_name>") method in the instance filter, but this breaks the {instance} value for the OID.

Any help on a working solution?

Here's an example of my current DCI config:

Description: Input Bandwidth (bps) on {instance}
SNMP OID: .1.3.6.1.2.1.2.2.1.10.{instance}
Transformation: Delta/sec, and $1 * 8 in the script
Instance discovery: SNMP walk of OID .1.3.6.1.2.1.2.2.1.10

Thanks,
Richard

[tomaskir]

UPDATE: Please see this post:
https://www.netxms.org/forum/configuration/interface-names-in-instance-discovery/msg18102/#msg18102

Description: Traffic on {instance-name} - bits/s IN
Parameter: .1.3.6.1.2.1.31.1.1.1.6.{instance}
Origin: SNMP - Unsigned Int 64bit

Transformation: Average delta per sec
Transform script: return $1 * 8;

Instance discovery: SNMP Walk - OIDs
Base SNMP OID: .1.3.6.1.2.1.2.2.1.1
Instance discovery script:

transport = CreateSNMPTransport($node);
if (transport == null)
	return false;

// get the interface name to return as instance-name
vb = SNMPGet(transport, ".1.3.6.1.2.1.31.1.1.1.1." . $1);
if (vb == null)
	return false;

// filter out loopback
if (vb->value == "lo")
	return false;

return %(true, $1, vb->value);

Please note the node has to support the IfXTable for this script to work.

[rgkordia]

Perfect.  Thanks Tomaskir.  Now that you pointed this out, I found it in the docs   Works like a charm.

Regards,
Richard

[glebofff]

I wonder is there any reasons left to use snmp transport in such cases. We can get all interesting information from $node object and its child interfaces:

i = GetInterfaceObject($node, $1);
if (i != null && i->adminState == 1)
{
  return %(true, $1, i->name);
}
return false;

[LBKRE]

Very nice......
but.....
how do i get the "instance name when" i use this DCIs as title in the Performance tab?

"%{node-name} {node-name}" doesn't work.

Greeting from Germany
Ludger

[victor]

Hi,

try to use {instance} in graph title - it should be replaced with the value seen in Thresholds -> Instance in DCI properties.

Best regards,
Victor

[tomaskir]

Also as a side note to discussion about returning interface names.

"SNMPWalk - OIDs" now actually returns value of the OID as $2.

So now, script can look like this:

Instance discovery: SNMP Walk - OIDs
Base SNMP OID: .1.3.6.1.2.1.31.1.1.1.1

Instance discovery script:

return %(true, $1, $2);

So NetXMS will push to the script $1 as discovered instance (same as before), but now $2 is pushed to the script as the value of that OID automatically.
This makes the above script possible, and you dont have to use CreateSNMPTransport or GetInterfaceObject anymore.

[sarangtc]

Let me summarize to make it easy for other beginners like me:
for inward traffic (using the 64bit snmp oid)

In "Data Collection Confiugration:"

Description: Traffic on {instance-name} - bits/s IN
Parameter: .1.3.6.1.2.1.31.1.1.1.6.{instance}
Origin: SNMP - Unsigned Int 64bit

Transformation: Average delta per sec
Transform script: $1 * 8

Instance discovery: SNMP Walk - OIDs
Base SNMP OID: .1.3.6.1.2.1.31.1.1.1.1
Instance discovery script: return %(true, $1, $2);

For OUT traffic just change:
Description: Traffic on {instance-name} - bits/s OUT
Parameter: .1.3.6.1.2.1.31.1.1.1.10.{instance}