Alarm for "MTU mismatch within same transport zone" on the NSX Manager UI.

Products

• VMware NSX

Issue/Introduction

Event ID: mtu_check.mtu_mismatch_within_transport_zone

Alarm Description

• Purpose: Check if MTU configuration mismatch between Transport Nodes (ESXi, KVM and Edge) attached to the same Transport Zone.
• Impact: MTU values on all switches attached to the same Transport Zone not being consistent will cause connectivity issues.

Environment

VMware NSX 4.x
VMware NSX-T Data Center 3.x

Resolution

Steps to Resolve

For 3.2.0 and higher

Recommendation:

1. Navigate to System | Fabric | Settings | MTU Configuration Check | Inconsistent on the NSX UI to check more mismatch details.
2. Set the same MTU value on all switches attached to the same Transport Zone by invoking the NSX API PUT /api/v1/host-switch-profiles/ with mtu in the request body, or API PUT /api/v1/global-configs/SwitchingGlobalConfig with physical_uplink_mtu in request body.