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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > How does NPM calculate interface bandwidth?

How does NPM calculate interface bandwidth?

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Created by Melanie Boyd, last modified by Craig Healy on Oct 04, 2017

Views: 2,766 Votes: 0 Revisions: 6

Overview

This article describes how NPM calculates interface bandwidth, and what conversion factors it uses.

Environment

  • Orion all versions

Detail

To determine interface bandwidth, Orion NPM polls the following object identifiers (OIDs):

Information Type OID Name OID Value
Bandwidth - 32-bit Counter ifInOctets 1.3.6.1.2.1.2.2.1.10
Bandwidth - 32-bit Counter ifInUcastPkts 1.3.6.1.2.1.2.2.1.11
Bandwidth - 32-bit Counter ifInNUcastPkts 1.3.6.1.2.1.2.2.1.12
Bandwidth - 32-bit Counter ifOutOctets 1.3.6.1.2.1.2.2.1.16
Bandwidth - 32-bit Counter ifOutUcastPkts 1.3.6.1.2.1.2.2.1.17
Bandwidth - 32-bit Counter ifOutNUcastPkts 1.3.6.1.2.1.2.2.1.18
     
Bandwidth - 64-bit Counter ifHCInOctets 1.3.6.1.2.1.31.1.1.1.6
Bandwidth - 64-bit Counter ifHCInUcastPkts 1.3.6.1.2.1.31.1.1.1.7
Bandwidth - 64-bit Counter ifHCInMulticastPkts 1.3.6.1.2.1.31.1.1.1.8
Bandwidth - 64-bit Counter ifHCOutOctets 1.3.6.1.2.1.31.1.1.1.10
Bandwidth - 64-bit Counter ifHCOutUcastPkts 1.3.6.1.2.1.31.1.1.1.11
Bandwidth - 64-bit Counter ifHCOutMulticastPkts 1.3.6.1.2.1.31.1.1.1.12

For more information about the OIDs Orion NPM polls for interface statistics, see this article.

This polled data is provided in terms of octets. Orion use the following conversion factors to derive kilobytes (KB), megabytes (MB), and gigabytes (GB):

  • 1 KB = 1,000 octets
  • 1 MB = 1,000 KB = 1,000,000 octets
  • 1 GB = 1,000 MB = 1,000,000 KB = 1,000,000,000 octets

 

 

 

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