VMs on the same ESXi host as the Active Edge have no North South connectivity

Products

• VMware NSX Networking

Issue/Introduction

Symptoms:
The following conditions are met

• NSX-T Data Center 3.0
• vSphere 7.0
• NSX-T is configured to use vDS and not NVDS
• Edge and Host TEPs are on separate VLANs
• Edge VM connects to a vDS trunk portgroup which defaults to VLAN 0-4094
• Edge VM connects to the same vDS configured for NSX-T

Environment

VMware NSX-T Data Center

Cause

The Edge VM cannot resolve the MAC address of VMs running on the same host. ARP replies from the VM sent to the Edge are not routed externally as expected. Instead the ARP reply is sent directly to the Edge VM internally and unencapsulated on the host and is dropped.

Resolution

Issue was resolved in NSX-T Data Center 3.0.1

Workaround:
The following are workaround options:

On the vSphere Client
 - Edit the Edge portgroup
 - Edit the VLAN configuration
 - Remove the default range 0-4094 and specify only the VLANs used by the Edge e.g. Overlay VLAN, Uplink VLANs
   Note: Ensure the Host TEP VLAN is not included

or

Connect the Edge VM to a VLAN trunk Logical Switch instead of the vDS trunk portgroup