All Products
Search
Document Center

Virtual Private Cloud:Default VPCs and default vSwitches

Last Updated:Feb 27, 2024

If no virtual private cloud (VPC) is created in a region, you can specify the system to create a default VPC and a default vSwitch when you create an Elastic Compute Service (ECS) instance, a Classic Load Balancer (CLB) instance, or an ApsaraDB RDS instance. After the instance is created, a default VPC and a default vSwitch are created.

Features of default VPCs and default vSwitches

When you specify the system to create a default VPC, you can choose to create a default vSwitch in a random zone or a specified zone. The following table describes the features of default VPCs and default vSwitches.

Feature

Default VPC

Default vSwitch

Quantity

Each region supports at most one default VPC.

A default vSwitch belongs to a default VPC. You can create only one default vSwitch in each zone.

Subnet mask and available private IP addresses

The subnet mask of a default VPC is 16 bits in length. For example, the 172.31.0.0/16 CIDR block provides up to 65,532 private IP addresses.

The subnet mask of a default vSwitch is 20 bits in length. For example, the 172.16.0.0/20 CIDR block provides up to 4,092 private IP addresses.

Quota

Default VPCs do not consume the VPC quota that is allocated to your Alibaba Cloud account.

Default vSwitches do not consume the vSwitch quota for a VPC.

Creation method

Default VPCs are created by Alibaba Cloud. The VPCs that you create are custom VPCs.

Default vSwitches are created by Alibaba Cloud. The vSwitches that you create are custom vSwitches.

Operations and specifications

  • You can manage default VPCs and custom VPCs in the same manner.

  • The same limits on specifications apply to default VPCs and custom VPCs.

  • You can manage default vSwitches and custom vSwitches in the same manner.

  • The same limits on specifications apply to default vSwitches and custom vSwitches.

Cloud resources that support default VPCs and vSwitches

You can specify the system to create a default VPC and a default vSwitch when you create an ECS, CLB, or ApsaraDB RDS instance. For more information, see the following topics:

Note

If you want the system to create a default VPC and a default vSwitch when you create an ECS instance, make sure that no VPC is created in the region.

默认VPC和交换机