How does the SPECTRUM "Traffic Resolution" AutoDiscovery Modeling Protocol work? (Legacy KB ID CNC TS32912 )

Document ID : KB000051823
Last Modified Date : 14/02/2018
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Related Issues/Questions:
How does the SPECTRUM "Traffic Resolution"  AutoDiscovery Modeling Protocol work?

Problem Environment:
All versions of SPECTRUM
Traffic Resolution
Modeling Protocol
The Modeling Your IT Infrastructure Administrator Guide defines the Traffic Resolution AutoDiscovery Modeling Protocol as follows:

Traffic Resolution - If the Traffic Resolution parameter is set to Yes, SPECTRUM will use network traffic data (ifInOctet and ifOutOctet statistics) to determine connections between interfaces, and in many cases eliminate the need for a Fanout model.

The folllowing is a more detailed explanation of how the Traffic Resolution AutoDiscovery Modeling Protocol works.

AutoDiscovery will first use the discovery protocols, like SAT, CDP, Spanning Tree etc, to map layer-2 port connectivity.  If for some reason, AutoDiscovery could not determine the exact port level connection among 3 or more ports, a Fanout model would be created to represent this connection and then AutoDiscovery would invoke the Traffic Resolution protocol if selected.

For each port connected to this Fanout, AutoDiscovery will read the ifInOctets and ifOutOctets attributes from the interfaces mib.  AutoDiscovery will the wait for one minute and read the ifInOctets and ifOutOctets attributes from the interfaces mib again.  AutoDiscovery will then calculate the delta of ifInOctets and ifOutOctets for each port connected to the Fanout.  If the delta of one port's ifInOutOctet has a close match with delta of another port?s ifOutOctets, AutoDiscovery will assume the ports are connected and create the proper associations in the SPECTRUM database.

(Legacy KB ID CNC TS32912 )