Cloud Interconnect provides low latency, highly available connections that enable you to reliably transfer data between your on-premises and VPC networks. Also, Cloud Interconnect connections provide RFC 1918 communication, which means internal (private) IP addresses are directly accessible from both networks.
Cloud Interconnect offers two options for extending your on-premises network. Google Cloud Interconnect - Dedicated (Dedicated Interconnect) provides a direct physical connection between your on-premises network and Google’s network. Google Cloud Interconnect - Partner (Partner Interconnect) provides connectivity between your on-premises and GCP VPC networks through a supported service provider.
For a comparison to help you choose between the two offerings, see Choose Interconnect Type.
Benefits of Cloud Interconnect
- Traffic between your on-premises network and your VPC network doesn't traverse the public Internet. Traffic traverses a dedicated connection or through a service provider with a dedicated connection. By bypassing the public Internet, your traffic takes fewer hops, so there are less points of failure where your traffic might get dropped or disrupted.
- Your VPC network's internal (RFC 1918) IP addresses are directly accessible from your on-premises network. You don't need to use a NAT device or VPN tunnel to reach internal IP addresses. Currently, you can't use Cloud Interconnect to access external (non-RFC 1918) IP addresses; instead, you must use a separate connection, such as Carrier Peering.
You can scale your connection capacity to meet your particular requirements.
For Dedicated Interconnect, connection capacity is delivered over one or more 10 Gbps or 100 Gbps Ethernet connections, with the following maximum capacities supported per interconnect:
- 8 x 10 Gbps connections (80 Gbps total)
- 2 x 100 Gbps connections (200 Gbps total)
For Partner Interconnect, the following connection capacities for each interconnect attachment (VLAN) are supported:
- From 50 Mbps to 10 Gbps up to 8 x 10 Gbps interconnect attachments (VLANs) (80 Gbps)
You can request 100G connections at any of the locations listed on the Colocation facilities page.
The cost of egress traffic from your VPC network to your on-premises network is reduced. Cloud Interconnect is generally the least expensive method if you have a high-volume of traffic to and from Google’s network.
You can use Cloud Interconnect in conjunction with Private Google Access for on-premises hosts so that on-premises hosts can use internal IP addresses rather than external IP addresses to reach Google APIs and services. For more information, see Private Access Options in the VPC documentation.
If you don't require the low latency and high availability of Cloud Interconnect, consider using Cloud VPN to set up IPsec VPN tunnels between your networks. IPsec VPN tunnels encrypt data by using industry standard IPsec protocols as traffic traverses the public Internet.
An IPsec VPN tunnel doesn't require the overhead or costs that are associated with a direct, private connection. Cloud VPN only requires a VPN device in your on-premises network.
For answers to common questions about Cloud Interconnect architecture and features, see the Cloud Interconnect FAQ.
Learn more about each Cloud Interconnect offering before you start the provisioning process: