VMs experiencing packet drops on internal network with jumbo frames (MTU greater than 1500)
Article ID: 406943
Updated On:
Products
VMware NSX
Issue/Introduction
The newly deployed VMs are experiencing packet drops. VMs in the same hosts have no packet drops, but VMs from one host to the next have packet drops.
Tests with MTU of 1774 shows that entire frame is not received by the RX VMs.
The MTU set on uplink profile of ESXi hosts was 9000 as shown below
Environment
NSX 3.x
Cause
The MTU was set to 1500 on switch ports (uplink switches) connected to uplinks of ESXi hosts (vmnicX). The End-to-End MTU is to be consistent and set to allow jumbo frames.
Resolution
Updated MTU on the switch ports to which ESXi uplinks were connected to 9000 then vmkping between TEP interfaces of ESXi hosts was OK.
Additional Information
Refer below documents for more information
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