The VIP of a virtual service can either be a static IP that the user manages, or it can be allocated from the NSX Advanced Load Balancer internal IPAM.
Note:
The subnet from which the VIP is allocated, should not overlap with the existing subnets in GCP.
If the VIPs for a virtual service need to be managed by NSX Advanced Load Balancer, then the NSX Advanced Load Balancer virtual network needs to be created and then added to the IPAM created.