Hello Everyone! Having an issue with SNMP Discovery

[Gibran Ali]

Hello All,

I have relatively very little experience with Discovery. I have been given a task to create a Custom Probe and Sensor, to populate the "Location" field on the cmdb_ci_ip_router.

The network Team provided me with an OID, as well as a network range. They also said that the devices are currently 'polling' , however location is not being filled in correctly

OID = 1.3.6.1.4.1.637.3.1.5.3.1.5     / http://oid-info.com/get/1.3.6.1.4.1.637.3.1.5.3.1.5 ( info about the OID)

I have tried following a few posts from the community, but have not found any success.   So far this is what i have done step by step.

1) go into SNMP system OID's and added this ID, with manufacturer name as I do not know the model.

2) Added this device into the SNMP classification for Routers.

3) Created a Probe called 'Routing Location', which has the same information as the OOB probe called (SNMP - Routing)

4) Created a Sensor called Routing Location, Which has same information as the sensor, except i added the following script after finding something similar on the community.

SCRIPT

new DiscoverySensor({

process: function(result) {

var snmp = new SNMPResponse(result);

var oid_mib2 = 'iso.org.dod.internet.private.mib-2.system.sysLocationu';   ////   ***this is not   correct...need to determine correct value****

gs.log(oid_mib2+ 'ALI');

var location = snmp.getOIDText(oid_mib2 + 'system.sysLocation'); ////// **** not sure if this is correct either *****

gs.log(location+ 'ALI'); //// current value of var location

gs.log(current.u_system_location+ 'ALI');

current.u_system_location = location + '\n';

// var loc = new GlideRecord ('cmn_location');                         *****Just In case GR needed for location*****

// loc.addQuery('name' , location);

// loc.query();

// if(loc.next())

//                                 {

// location = loc.sys_id;

// current.u_system_location = location;

//           }

},

type: "DiscoverySensor"

});

5) Also I am sure that the SNMP fields for this probe need some sort of configuration, but I am completely unaware on how to accomplish this. Somewhere i read something about doing an 'SNMP walk' to make sure you are connecting correctly , but again this is a new venue for me so I am completely unaware what to do at this point. Any help would be much appreciated. Thanks.

[Jeff Boltz1]

Hi Gibran Ali,

This is some code shared at Knowledge 15 at one of the Discovery sessions, not sure if it is still relevant/up to date:

SNMP-mib2-sysLocation Sensor

new DiscoverySensor({

      process: function(result) {

              var snmp = new SNMPResponse(result);

              var location = snmp.getOIDText('iso.org.dod.internet.mgmt.mib-2.system.sysLocation');

              current.short_description = location;

              current.device_type = 'firewall';      

      },

      type: 'DiscoverySensor'

});

Lab 8.3: Alternate Code to set the location to the location field of the CMDB record

new DiscoverySensor({ process: function(result) {

  var snmp = new SNMPResponse(result);

  var location = snmp.getOIDText('iso.org.dod.internet.mgmt.mib- ­"- ­"- ­" 2.system.sysLocation');

  current.device_type = 'firewall';

  var checkLocation = new GlideRecord('cmn_location');

  //If the GlideRecord query finds a cmn_location record matching the location returned from the OID set the sensor

  //record's location field to the location record from the cmn_location table and update the sensor record in the DB

  if (checkLocation.get(location)){ current.location =   checkLocation.sys_id;

      gs.log("location found " + checkLocation.sys_id,"location found");

      current.update();

}

else {

gs.log("location not found ","location not found"); checkLocation.initialize(); //creating a new cmn_location record checkLocation.name = location; //setting location name of OID t

      the name field on cmn_location record

var x = checkLocation.insert();

gs.log("location location created " + x ,"location not found"); current.location = x; //insert current location to sys_id of new record

current.update(); //update current record

}

},

type:'DiscoverySensor'

});

It was either Discovery 101, 102 or 103, which you may be able to find here; On Demand Library

Take care,
Jeff

[Gibran Ali]

Hello Jeff,

Thanks for your response. Just had a few questions if you can clarify.

1) How do I determine what to write in the SNMP field box of the custom probe that I made?

2) In the script , what am I supposed to be assigning this variable to , so I can fetch the location value from this OID?

  var snmp = new SNMPResponse(result);

  var location = snmp.getOIDText('iso.org.dod.internet.mgmt.mib-"-"-" 2.system.sysLocation');

I am positive that the current value it is assigned to is not correct. I have read about SNMP walk and stuff with an OID, but I am not sure on what to assign this variable to? Any help or a nudge in the right direction would be much helpful. Thanks.

This is the current OID.

OID = 1.3.6.1.4.1.637.3.1.5.3.1.5

Kind Regards,

Gibran Ali

[Dale Hynes]

If your Discovery Schedule uses an IP Range(s) or Discovery Range Set(s) that are tied to a single Location, e.g. 172.23.45.xxx is 'SLC Office' then you can set Location value in the CI by relating the relevant Location record to the Discovery Schedule.

[Dave Smith1]

gibran ali wrote:

Hello All,

I have relatively very little experience with Discovery. I have been given a task to create a Custom Probe and Sensor, to populate the "Location" field on the cmdb_ci_ip_router

I would advise attending a Discovery course - we cover exactly this problem in one of the labs (creating custom probes and sensors, as well as interrogating SNMP-enabled devices)

5) Also I am sure that the SNMP fields for this probe need some sort of configuration, but I am completely unaware on how to accomplish this. 

You're partly correct - the SNMP fields on the device need configuration (i.e.: the location field being set).

Somewhere i read something about doing an 'SNMP walk' to make sure you are connecting correctly , but again this is a new venue for me so I am completely unaware what to do at this point. Any help would be much appreciated. Thanks. 

Now that bit I can help with (again, I demo this on Disco courses).   If you're using Windows, head here: https://syslogwatcher.com/cmd-tools/snmp-walk/ - that's a great little tool for interrogating SNMP devices.   If you've got a Linux box, there's a good change "snmpwalk" is already installed (if not, get your Linux admin to add it - it's a 5-second job)

For windows, type something like: snmpwalk.exe -r:10.20.30.40 -v:1 -c:public where:

• v: is the version
• c: community string
• r: is the IP address of the host ("router") being interrogated.

If you want just a specific OID, use -os:1.3.6.1.4.1.637.3.1.5.3.1.5 to get just that info back.

Give that a go, see how it works, and we'll take it from there.   But I always recommend having some SNMP query tool to test info works before beginning Discovery.