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Cisco Bug: CSCvu01066 - N3548 produce wrong InOctets counter on specific interface

Last Modified

May 26, 2020

Products (1)

  • Cisco Nexus 3000 Series Switches

Known Affected Releases

6.0(2)A8(11b)

Description (partial)

Nexus 3548 produce inaccurate InOctets counter when the input speed is higher than 500mbps on one specific interface. All other interface works fine and the OutOctets work fine too.

We indicate this with the help of the input utilization on the 'show interface'. When we generate the packet with the speed higher than 500 Mbps, the 'show interface' does show 500mbps, but if we do the calculation from OutOctets with the formula mentioned in

https://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/8141-calculate-bandwidth-snmp.html

the speed remains in 400mbps.

At the same time,' show interface counter' have the same value as SNMP extraction. Therefore,  the SNMP works fine. The broken part seems on the interface counter itself.

Symptom:
When input rate exceed 500mbps, the InOctets counter on 'show interface counter' produce inaccurate number. The input utilisation we calculate is even collapsing with the output providing in 'show interface'  on the same device.

Conditions:
N3K-C3548P-10GX connecting directly to traffic generator on 1/45.
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