Total Load is unrealistically high on Full duplex ports in SPECTRUM

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Article ID: 51813

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Updated On:

Products

CA Spectrum

Issue/Introduction

Total Load is unrealistically high on Full duplex ports in SPECTRUM

When using the Total_Load (0x12d92) attribute on a Full Duplex interface, the value can sometimes be beyond the port's capacity.

Cause

Setting total load thresholds on full duplex links actually does not make sense to do and will cause false alarms. This is because Full duplex
interfaces are capable of 100% Load_In AND 100% Load_Out, so combining these will produce a utilization well over 100%.

Environment

Any

Resolution

With full duplex interfaces TOTAL_LOAD thresholds should not be configured, and instead, separate watches/thresholds for In_Load (0x12d93) and Out_Load  (0x12d94) should be configured. This is due to the fact that the load on Full Duplex connections can theoretically hit double the ifSpeed/ifHighSpeed of the interface. (100% utilization becomes 200%).

If a Total Load threshold is configured on a Full Duplex port it should be set it to a level that is appropriate for the full duplex port.