This topic describes how to allow ECS instances in the classic network and instances of E-MapReduce (EMR) clusters in a VPC to access each other.

Alibaba Cloud provides two network types: classic network and VPC. EMR clusters run in a VPC, while business systems of many users still run in the classic network. To connect these two types of networks, Alibaba Cloud launched the ClassicLink solution. For more information, see Overview.

Perform the following steps to implement this solution:

  1. Create a VSwitch based on the CIDR blocks described in the "Overview" topic.
  2. Use the VSwitch to deploy an EMR cluster.
  3. In the ECS console, connect the required instances of the classic network to the VPC where the EMR cluster is deployed.
  4. Configure security group rules.