Low-speed interfaces showing no data for bits in/bits out, utilization in/utilization out in DX Netops Performance Management

Products

• CA Infrastructure Management
• CA Performance Management - Usage and Administration
• DX NetOps

Issue/Introduction

Low-speed interfaces showing no data for bits in/bits out, utilization in/utilization out in DX Netops Performance Management

Environment

Release : 20.2

Component : IM Reporting / Admin / Configuration

Cause

The amount of data being reported by the device is larger than should be able to be passed based on the interface speed.

To help prevent invalid spikes, a guard has been placed in the High-Speed Interface Vendor certification.

Resolution

From:

http://<DA>:8581/typecatalog/certifications/snmp/IfXTableMib

<!-- Assume low speed interfaces have a max speed of 20Mbps at 5 min polling, anything higher than that should use high speed counters. Then maximum number of bits transferred in a 5 min window should be 20 Mbps x 300 sec = 20,971,520 x 300 sec = 6,291,456,000 bits In octets => 6,291,456,000 bits / 8 = 786,432,000 octets So that's the max number of octets we should see in a 5 min window. Rearrange that to pull out the five minutes: 300 * 20 * 1024*1024 /8 = 300 * 2,621,440 -->
<Variable name="maxOctets20Mbps">_rspDuration*2621440L</Variable>
<Variable name="CalculatedIfInOctets">ifInOctets <= maxOctets20Mbps ? ifInOctets : null</Variable>
<Variable name="CalculatedIfOutOctets">ifOutOctets <= maxOctets20Mbps ? ifOutOctets : null</Variable>

When I looking at the counter deltas in detailed poll logging for ifInOctets /ifOutOctets they are greater than maxOctets20Mbps (2621440 * delta).

When this happens you will see CalculatedIfInOctets or CalculatedIfOutOctets as NULL as well in detailed poll logging

The low speed counters are being used appropriately due to the interface speed.