What is IBM Cloud Transit Gateway?

IBM Cloud® Transit Gateway is a network service used to interconnect IBM Cloud classic IaaS and IBM Cloud Virtual Private Cloud (VPC) resources across an IBM public cloud.

With IBM Cloud Transit Gateway, you can connect and manage your IBM Cloud VPC networks. IBM Cloud Transit Gateway gives clients dynamic scalability for easier business growth, high availability for better customer satisfaction and peace of mind that their data isn’t traversing the public internet. IBM Cloud Transit Gateway can support hybrid workloads, frequent data transfers, and private workloads, and can ease the administration of your IBM Cloud environment.

Chart showing use of Transit Gateway across 2 regions

Connect your resources

  • Deliver your applications around the world, with global routing across the IBM Cloud network.
  • Simplify your network and build applications that span hundreds of VPCs without the operational burden of managing a distributed network.
  • Build a global network, easily scaling and sharing IBM Cloud services such as IBM classic infrastructure resources and IBM VPCs.
  • Grow capacity quickly and easily by smoothing the impact of peak demands on workloads.
  • Keep traffic within the IBM Cloud network without traversing the public internet.


Routing options

IBM Cloud Transit Gateway supports local and global routing between VPCs and IBM Cloud classic infrastructure. Traffic doesn’t traverse the public internet.

Privacy controls

Define your own IP addresses and reduce threat vectors by remaining on the IBM private network. Administer access policies through integration with IBM Cloud Identity and Access Management.

Centralized management

IBM Cloud Transit Gateway centralizes your private network across IBM Cloud VPC and IBM classic infrastructure connections in a single console.

High availability

Available in all multizone regions (MZRs) worldwide to provide global solutions, IBM Cloud Transit Gateway has a high availability 99.99% SLA and no single point of failure.

Private interconnectivity

Privately interconnect IBM Cloud VPC to VPCs (gen 1 and gen 2 VPCs). Privately interconnect VPCs between accounts, between different companies. Opt-in model per specific VPC connection.

Use cases

Connect cloud-native applications

IBM Cloud VPC makes it easier to host cloud-native applications on the public cloud. IBM Cloud Transit Gateway connects those applications for high availability, disaster recovery and edge access.

Extend applications globally

Securely connect to existing data centers, optimizing elasticity and global reach of the public cloud for applications to help support disaster recovery.

Increase network capacity and manage centrally

Move internal corporate applications to the cloud, provide additional capacity or plan for peak capacity.

Routing options

Local routing

Local routing provides interconnectivity to all accessible resources within the same IBM Cloud MZR within an account. Local routing is latency-tolerant to improve network performance and the user experience.

Flowchart showing routing between multiple local VPCs through IBM Cloud Transit Gateway

Global routing

Global routing expands connection capabilities to all accessible MZRs and resources in your account. For example, it can connect resources within the US South region with resources in the US East region, or with any MZR in your account.

Flowchart showing routing between multiple global VPCs through IBM Cloud Transit Gateway

Multi-account routing

Multi-account routing allows enterprises with multiple accounts under their control to interconnect VPC resources through an opt-in model between VPC account owners. The transit gateway account owner can send a connection request to a VPC owner in a different account (same or different company).

Flowchart of multi-account interconnectivity between VPCs

Optimized routing

Traffic within the same MZR routes locally so that latency is minimized. Intra-region traffic and classic access doesn’t incur data transfer charges. By providing support for multiple Transit Gateways per VPC, you can achieve traffic isolation.

Chart showing how support for transit gateways can optimize routing