Your organization is deploying a hybrid architecture connecting an on-premises data center with Google Cloud VMware Engine (GCVE) and native Google Cloud Virtual Private Cloud (VPC) networks hosting Google Kubernetes Engine (GKE) and Compute Engine workloads. The network team plans to provision dozens of NSX-T segments across multiple application tiers. You need to design the routing topology between VMware Engine, native VPC services, and the on-premises environment to maintain scalable routing, prevent route table exhaustion, and adhere to recommended architectural best practices. Which set of routing and NSX-T network configurations should you implement?

Allocate contiguous IP address space for NSX-T segments, configure route summarization at the Tier-0 gateway, and apply a route map when redistributing static routes into BGP to prevent 0.0.0.0/0 from being advertised: ### What this architecture entails **Google Cloud VMware Engine (GCVE)** integrates VMware Software-Defined Data Center (SDDC) components—such as **NSX-T Data Center**—directly with Google Cloud's high-speed software-defined network. Within GCVE, routing between logical segments and the rest of the network is managed hierarchically via **Tier-1** and **Tier-0 gateways**, which peer dynamically using **Border Gateway Protocol (BGP)** with Cloud Router across private service access. ### How it meets the requirements - **Contiguous IP address allocation**: Assigning contiguous CIDR blocks across NSX-T workload segments allows multiple discrete subnet ranges to be aggregated into broader network prefixes. - **Tier-0 route summarization**: Summarizing NSX segment routes, NAT IP ranges, and management endpoints at the **Tier-0 gateway** dramatically reduces the number of route entries exported to Google Cloud. This keeps prefix advertisements well below the regional **250 advertised route limit** from VMware Engine to the VPC network. - **Route map filtering on redistribution**: Applying a route map to block `0.0.0.0/0` during static-to-BGP redistribution prevents an accidental default route override, ensuring predictable routing behavior between on-premises and Google Cloud. ### Key advantages and capabilities - **Route scale management**: Prevents exceeding Cloud Router learned route limits and private cloud route reception limits. - **Deterministic traffic engineering**: Summarized custom advertisements on Cloud Router ensure clean transit across **Cloud Interconnect** and **Cloud VPN**. - **Operational hygiene**: Eliminates routing loops and unexpected asymmetric blackholing caused by unintended default route leakage. ### Why this is optimal This approach aligns strictly with Google Cloud networking best practices for GCVE, optimizing route table capacity while preserving seamless Layer 3 connectivity across hybrid environments.