---
title: "UplinkPortMtuNotSupportEvent"
description: "Not all of the VLAN MTU settings on physical switch allows vSphere Distributed Switch max MTU size packets passing. There is an issue with the vSphere distributed switch MTU configuration. Review the event description for detail on the cause."
canonical: "https://helpcenter.veeam.com/docs/mp/kb/uplinkportmtunotsupportevent.html"
breadcrumb: "Veeam MP for VMware Online Knowledge Base > Event-Based Rules > vSphere Host Network Error > UplinkPortMtuNotSupportEvent"
dateModified: "2026-09-10"
---

# UplinkPortMtuNotSupportEvent

## Summary

Not all of the VLAN MTU settings on physical switch allows vSphere Distributed Switch max MTU size packets passing.

## Causes

There is an issue with the vSphere distributed switch MTU configuration. Review the event description for detail on the cause.

## Resolutions

Review VMware online documents such as [vSphere Networking Guide](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-35B40B0B-0C13-43B2-BC85-18C9C91BE2D4.html) to resolve issues.

## External

Refer to the [VMware Online Documentation](https://techdocs.broadcom.com/) for more information.