Cloud Router configuration requires a unique name that is permanent, a VPC network, and a GCP region. Also, you must specify the ASN, which is a requirement for establishing BGP sessions with other BGP routers. Cloud Router announces by default all visible subnets, depending on whether you choose Regional or Global dynamic routing mode. In Regional mode, only the subnets within the Cloud Router region will be advertised. In Global mode, all the VPC subnets will be advertised. Once your Cloud Router is created, you need to configure a BGP peering with the other BGP router.

BGP peering requires the following:

• A name
• The ASN of the peer you are connecting to
• The IP addresses for the local Cloud Router
• The remote on-premises router IP address