Cannot see interfaces information in DX UIM snmpcollector probe

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

We are monitoring several Routers and Switches with the SNMPcollector probe and on some of the discovered devices we are seeing different issues: 

• Not able to see some of the discovered Interface Information (ifDescr, ifPhysAddress, ifType, etc..) 

 

• In some other device the Interface node is not even visible. 

 

 

The Vendor Certification is returning the information missing. 

The Devices we are discovering are supported. 

 

 

Environment

• DX UIM 20.4.* / 23.4.* 
• SNMPCOLLECTOR probe any version of the probe 4.**

Cause

During the Device discovery the probe is not able to capture the Interface information:

The snnmpcollector.log might show: 

[..]
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifAdminStatus
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifType
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifSpeed
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifMtu
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifPhysAddress
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifOperStatus
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifDescr
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifAdminStatus
Sep 24 13:16:32:128 [DiscoveryController23, snmpcollector] Could not find a value for variable ifType
[..]

Resolution

To resolve this issue 


1. Open the SNMPcollector raw configure and change the following key: 

MAX_BATCH = 2

(if the key MAX_BATCH is not present, please add the key in the setup section) 

   

 

2. For the profiles where this issue is seen, increase the timeout: 

SNMP timeout in Milliseconds = 30000

 

 

3. Force component rediscover: 

Additional Information

MAX_BATCH:

By default, the snmpcollector gets the information from devices using an SNMP bulk request, including up to a maximum of 20 OIDs, (the default number when the MAX_BATCH key is not present).
Some SNMP devices will not accept a SNMP GetBulk of this size. 

So, default value is MAX_BATCH is 20. Setting it to 2 will reduce the size of the batch. 

 

Profile Timeout:

Unless you are seeing any other issue after changing these settings you can safely keep the Max Batch = 2 and timeout set to 30000ms (30 seconds)
These values can be tuned for better performance and results.