Smarts: What SNMP information does Smarts use to calculate interface performance?

Products

• VMware

Environment

VMware Smart Assurance - SMARTS

Resolution

What SNMP information does Smarts use to calculate interface performance?
How does Smarts calculate interface performance?

What are the thresholds used by Smarts in interface performance calculations?

The code used for interface performance calculations is compiled, so the specific formulas used in these calculations are not available for general publication. However, Smarts documents at a high level how to calculate each of the interface performance thresholds in the Smarts IP Performance Manager User's Guide. The following sections of this Fix statement provide the threshold descriptions found in this guide and the OIDs Smarts uses for interface performance calculations.

Interface performance calculation thresholds
The following are the interface performance calculation thresholds used by Smarts: 

Broadcast Threshold
Sets upper threshold for broadcast traffic expressed as a
percentage of the total bandwidth.

Collision Threshold
Sets upper threshold for broadcast traffic expressed as a
percentage of the total bandwidth.

Discard Threshold
Sets the upper threshold for dropped packets expressed as
a percentage of the total number of packets.

Error Threshold
Sets the upper threshold for packet errors expressed as a
percentage of the total number of packets.

Error Traffic Threshold
Sets the minimum packet rate for a network adapter expressed as a
percentage of total bandwidth. Value can be any number
between 0.1 and 100.0.
For example, 0.2 is a valid value.

Queue Drop Threshold
Indicates the acceptable percentage of packets dropped because
of full queues, expressed as a percentage of the total number
of packets.

Utilization Threshold
Sets the upper threshold for link utilization expressed as a
percentage of the total bandwidth.

OIDs used for interface performance calculations
The OIDs Smarts uses for interface performance calculations are the following:

ifInOctets = ".1.3.6.1.2.1.2.2.1.10

ifOutOctets = ".1.3.6.1.2.1.2.2.1.16

ifInUcastPkts     = ".1.3.6.1.2.1.2.2.1.11
ifInNUcastPkts    = ".1.3.6.1.2.1.2.2.1.12

ifInDiscards      = ".1.3.6.1.2.1.2.2.1.13
ifInErrors        = ".1.3.6.1.2.1.2.2.1.14
ifInUnknownProtos = ".1.3.6.1.2.1.2.2.1.15
ifOutOctets       = ".1.3.6.1.2.1.2.2.1.16

ifOutUcastPkts    = ".1.3.6.1.2.1.2.2.1.17
ifOutNUcastPkts   = ".1.3.6.1.2.1.2.2.1.18
ifOutDiscards     = ".1.3.6.1.2.1.2.2.1.19
ifOutErrors       = ".1.3.6.1.2.1.2.2.1.20

ifHighSpeed          = ".1.3.6.1.2.1.31.1.1.1.15
ifHCInOctets         = ".1.3.6.1.2.1.31.1.1.1.6
ifHCInUcastPkts      = ".1.3.6.1.2.1.31.1.1.1.7

ifHCInMulticastPkts  = ".1.3.6.1.2.1.31.1.1.1.8
ifHCInBroadcastPkts  = ".1.3.6.1.2.1.31.1.1.1.9
ifHCOutOctets        = ".1.3.6.1.2.1.31.1.1.1.10
ifHCOutUcastPkts     = ".1.3.6.1.2.1.31.1.1.1.11
ifHCOutMulticastPkts = ".1.3.6.1.2.1.31.1.1.1.12
ifHCOutBroadcastPkts = ".1.3.6.1.2.1.31.1.1.1.13