Operational Defect Database
BugZero updated this defect 55 days ago.
Data sources
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VMware | 50114268
Intermittent Packet Loss on Uplink for an NSX Environment
Last update date:
3/25/2024
Affected products:
Update Manager
vSphere ESXi
vCenter Converter
vCenter Converter Standalone
NSX for vSphere
vCenter Server
vCenter Server Appliance
Affected releases:
6.36.06.x6.26.1
Fixed releases:
No fixed releases provided.
Description:
Symptoms
Small percentage of packets being dropped intermittently in the NSX environment.ESXi(s) are installed on Cisco UCS with enic Driver.From the Packet Capture, it shows that the packet drops are seen on the physical NIC of the ESXi after the traffic is sent out form the VM/DLR towards the physical NIC of the ESXi. Cause: By default on the Cisco UCS that are using enic driver, the RSS is disabled which will result in having only one queue on the Physical NIC for the receiving path. As the amount of VXLAN traffic is normally higher than the normal, you may see this issue on the VXLAN traffic and not the normal traffic.
Resolution
To resolve the issue, raise a service request with your hardware vendor to implement below suggested recommendations as per their best practices. RSS Enabled/DisabledNumber of queue and the buffer size for each one while not encountering memory overload.VXLAN-Offloading.TSO Enable/Disable.
