NSX-V to NSX-T Migration using VCD Migration Tool

[Maliha_fayyaz]

Hi ,

I am going a test customer migration from NSX-V to NSX-T using the VCD Migration tool. While running the precheck this error is generating

Validating if source and target External networks have same subnets | All the Source External Networks Subnets are not present in Target External Network - NZ_CUST1_T0 for edgeGateway NZ-Cust1-IT-ESG. | Failed |

The external subnet defined at the ESG is 60.60.60.5/24 and the external uplink at the Tier 0 IP is 60.60.60.31 and 32 with /24.

Can anyone guide me what i am missing

Thanks

[Sreec]

This means, currently you are not using the same external subnet on NSX-V and NSX-T T0/VRF Edges. 

The target external network backed by a Tier-0 gateway or VRF gateway must use the same subnet(s) as the Org VDC gateway connected to the external network(s) in the source Organization VDC(s).  You need to correct this and run the migration tool again 

[Maliha_fayyaz]

Hi,

Thanks for the reply. That was not the issue. The source and destination were in the same subnet. The issue was that i created a dummy network in NSX-V ESG from VCD. In the migration tool document it states that we have to create that dummy network only at the VCD level for NSX-T ( which I misunderstood) . so after disabling that dummy network in NSX-V the pre-checks were completed without any error.

[Sreec]

That is correct. We should not connect the dummy network to source or destination edges.