Topology 1 Metric 100 comes from: Topology 2 Topology 3 CSR: Subnetworks 10.11.64-66 are on us-east1. Adding a new subnet to vpc001 but located in us-central1: 100.64.0.0/24 is advertised from central gateway. Topology 4 Default Config: Import/Export: Topology 5 CSR1000v RIB: Using the same AS vpc001 and vpc002 does not exchange routes. If we change vpc002 CR to a different AS (64515): Topology 6 Topology 7 Topology 8 References https://cloud.google.com/vpc/docs/using-routes#gcloud https://cloud.google.com/network-connectivity/docs/router/support/troubleshooting https://developer.hashicorp.com/terraform/tutorials/kubernetes/gke?in=terraform%2Fkubernetes&utm_offer=ARTICLE_PAGE https://cloud.google.com/vpc/docs/routes