NSX Edge Tunnels down in a collapsed cluster

Products

• VMware NSX

Issue/Introduction

In NSX-T datacenter and NSX. The edge nodes are deployed to a vCenter in a collapsed cluster. (NSX edge deployed to a host that is prepared for NSX).

The edge nodes have two networks that are connected to PortGroups in a VDS that are used for NSX overlay instead of a NVDS.

Host transport nodes and Edge nodes are using two different TEP IP Pool, however, the backing VLAN for host TEP and edge TEP are the same. 

While in a greenfield deployment (without any running VMs on the host that uses overlay network), not all edge TEP tunnels are up. 

While in a brownfield deployment, the host TEPs to Edge TEPs are down.

The down TEP have connectivity to each other within NSX edge node VRF 0 (Tunnel). 

Environment

VMware NSX-T datacenter

VMware NSX 

Cause

This is caused by edge TEP and host TEP in the same VLAN. 

Resolution

To resolve this issue: 

Have two separated VLANs for NSX edge TEP and Host Transport Node TEP. 

Or,

Create a NSX managed VLAN segment and attach the edge nodes to the portgroup

 

If you are unable to apply this workaround or it does not work for you, please open a support request with Broadcom support and reference this KB.