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How Does DX NetOps Spectrum Discover a Device using SNMPv3?

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Article ID: 256124

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Updated On:

Products

CA Spectrum DX NetOps

Issue/Introduction

How Does DX NetOps Spectrum Discover a Device using SNMPv3?

Environment

Release : All Supported Releases
Component : SPCDIS - Discovery and Modeling

Cause

Informational

Resolution

When you model a SNMPv3 device in Spectrum, Spectrum first sends a get-request to the device with a blank engineid, engineboots, enginetime, and username. A packet capture will show the following throughout the process.

 

The device then responds with a “report” packet informing Spectrum of the engineid, engineboots and enginetime along with an unknownengineid varbind:

 

Spectrum takes the engineid, engineboots and enginetime and stores that in its cache.  Spectrum then uses the SNMPv3 profile you configured to obtain the username, authentication password (if used) and privacy password (if used) and sends a standard v3 get-request for sysUptime.

 

In this case, the device responds with the proper information and Spectrum initiatives the rest of the modeling process.

Additional Information

NOTE: All information within the packet captures was generated via a device emulator and does not contain real device information.

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