Dedicated Interconnect provides direct physical connections between your on-premises network and Google's network. Dedicated Interconnect enables you to transfer large amounts of data between networks, which can be more cost-effective than purchasing additional bandwidth over the public internet.
Before you use Dedicated Interconnect
Ensure that you meet the following requirements:
- Be familiar with basic network interconnections so that you can order and configure circuits.
- Be familiar with Cloud Interconnect terminology.
- Your network must physically meet Google's network in a colocation facility. You must provide your own routing equipment. Your on-premises router is typically located in the colocation facility. However, you can also extend your connection to a router outside of the colocation facility.
In the colocation facility, your network devices must support the following technical requirements:
10-Gbps circuits, single mode fiber, 10GBASE-LR (1310 nm), or 100-Gbps circuits, single mode fiber, 100GBASE-LR4
IPv4 link local addressing
LACP, even if you're using a single circuit
EBGP-4 with multi-hop
How does Dedicated Interconnect work?
For Dedicated Interconnect, you provision a Dedicated Interconnect connection between the Google network and your own network. The following example diagram shows a single Dedicated Interconnect connection between a Virtual Private Cloud (VPC) network and your on-premises network.
For the basic setup shown in the diagram, a Dedicated Interconnect connection is provisioned between the Google network and the on-premises router in a common colocation facility. Your setup might be different if your on-premises router is not in the same colocation facility as your Interconnnect demarcation.
When you create a VLAN attachment, you associate it with a Cloud Router. This Cloud Router creates a BGP session for the VLAN attachment and its corresponding on-premises peer router. The Cloud Router receives the routes that your on-premises router advertises. These routes are added as custom dynamic routes in your VPC network. The Cloud Router also advertises routes for Google Cloud resources to the on-premises peer router.
To create and configure a Dedicated Interconnect connection, you start by ordering an Interconnect connection so that Google can allocate the necessary resources and send you a Letter of Authorization and Connecting Facility Assignment (LOA-CFA). After you receive the LOA-CFA, you need to submit it to your vendor so that they can provision the Interconnect connections between Google's network and your network.
You then need to configure and test the connections with Google before you can use them. After they're ready, you can create VLAN attachments to allocate a VLAN on the connection.
For detailed steps to provision a Dedicated Interconnect connection, see the Provisioning overview.
Redundancy and SLA
Depending on your availability needs, you can configure Dedicated Interconnect to support mission-critical services or applications that can tolerate some downtime. To achieve a specific level of reliability, Google has two prescriptive configurations:
- Establish 99.99% availability for Dedicated Interconnect (recommended)
- Establish 99.9% availability for Dedicated Interconnect
For the highest level availability, we recommend the configuration for
99.99% availability as the base configuration, as shown in the following diagram.
Clients in the on-premises network can reach the IP addresses of virtual
machine (VM) instances in the
us-central1 region through at least one of the
redundant paths. If one path is unavailable, the other paths can continue to
We recommend that you use the 99.99% availability configuration for production-level applications with a low tolerance for downtime. If your applications aren't mission-critical and can tolerate some downtime, you can use the 99.9% availability configuration.
The SLA requires properly configured topologies that are defined by the 99.99% and 99.9% configurations. These configurations ensure availability and provide an SLA.
Balance egress traffic with redundant Interconnect connections
When you have a redundant topology similar to the 99.99% configuration, there are multiple paths for traffic to traverse from the VPC network to your on-premises network. If the Cloud Routers receive the same announcement with equal cost (same CIDR range and same MED values), Google Cloud uses ECMP to balance the egress traffic across connections.
Create redundant Interconnect connections with sufficient capacity
The Best practices document describes best practices for creating redundant Interconnect connections that have sufficient capacity in a failover scenario. Following these practices helps ensure that events such as planned maintenance or hardware failures do not cause loss of connectivity.
Dedicated Interconnect availability
A Dedicated Interconnect connection is considered available if
you can send and receive packets (ICMP
ping) between a VM in a specific
Google Cloud region and a correctly configured machine in your on-premises
network. You should be able to send and receive packets through at
least one of your redundant connections.
Restrict Dedicated Interconnect usageBy default, any VPC network can use Cloud Interconnect. To control which VPC networks can use Cloud Interconnect, you can set an organization policy. For more information, see Restrict Cloud Interconnect usage.
- To find answers to common questions about Cloud Interconnect architecture and features, see the Cloud Interconnect FAQ.
- To find out more about Cloud Interconnect, see the Cloud Interconnect overview.
- To learn about best practices when planning for and configuring Cloud Interconnect, see Best practices.
- To find Google Cloud resource names, see the Cloud Interconnect APIs.