Switching loop when redirecting traffic to Service Insert

[flygoast]

Hi,

we are using a service insert on NSX-T 3.1 to process a E-W traffic.

• Our esxi has two nics, both as the uplink of the NVDS use the teaming policy: "Load Balance Source". 
• vmk0 has moved to the NVDS in a VLAN segment.
• We don't use the overlay segment, all the VM connect to VLAN segment with different VLAN ID

our network topo like this:

When I start redirect traffic to the 3rd Service VM, there would be a switching loop.

Can someone help me to find what's the problem, and how to solved it.

[VM_Yamato]

Hi, I would like to confirm some points.

1. Do you get any error message about switching loop?
2. The 3rd party service redirection is working correctly?

[flygoast]

Thanks for the reply.

1、 At the moment, a lot of packets droped. Look at the "L2 switch", there are a lot of "MAC move". so I guest there was a loop.

2、 The 3rd SVM just received the GENEVE packet then send back from the same vnic. At the moment of problem, I cant login into the ESXi and the SVM because of the packet drop.

I don't know how to troubleshooting.