Help Center/ Cloud Connect/ User Guide/ Central Networks/ Overview
Updated on 2026-03-09 GMT+08:00
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Overview

Central Network

Relying on the cloud backbone network, a central network allows you to easily set up a reliable, intelligent enterprise-grade network and manage global network resources on premises and on the cloud. By setting up a central network, you can enable communication between enterprise routers, as well as between enterprise routers and your on-premises data center, in the same region or different regions.

Application Scenarios

  • Cross-region communication on the cloud: Enterprise routers in different regions are added to a central network as attachments so that resources in these regions can communicate with each other over one network.
    Figure 1 Cross-region communication between enterprise routers
  • Communication between on-premises data centers and the cloud: Enterprise routers and global DC gateways are added to a central network as attachments. In this way, multiple VPCs on the cloud can communicate with on-premises data centers across regions.
    Figure 2 Communication between enterprise routers and on-premises data centers
  • Global network: By flexibly changing the central network policies, you can build a global network more conveniently.

Central Network Quotas

Table 1 Central network quotas

Quota Type

Default Quota

Adjustable

Central networks in an account

6

Yes

.

Policies for a central network

500

Yes

.

Policy document size (KB)

10

No

Enterprise routers on a central network as attachments in a region

1

No

Global DC gateways on a central network as attachments in a region

3

Yes

.

Constraints on Central Networks

  • To use a central network, the following resources must have been created:
    • Enterprise router: used to build a central network
  • Policy management
    • A central network can only have one policy. If you apply another policy for this central network, the policy that was previously applied will be automatically cancelled.
    • In each policy, only one enterprise router can be added for a region. All added enterprise routers can communicate with each other by default.
    • A policy that is being applied or cancelled cannot be deleted.
  • Cross-site connection bandwidth management
    • A cross-site connection bandwidth cannot be changed or deleted when it is being created, updated, deleted, frozen, unfrozen, or is recovering.
    • The total of cross-site connection bandwidths cannot exceed the global connection bandwidth.
    • If a cross-site connection bandwidth is deleted, you will still be billed for the global connection bandwidth.
Parent topic: Central Networks