Supplementary Network Interface
Supplementary network interfaces are a supplement to elastic network interfaces. If the number of elastic network interfaces that can be attached to your cloud server cannot meet your requirements, you can use supplementary network interfaces, which can be attached to VLAN subinterfaces of elastic network interfaces.
Application Scenarios
The number of elastic network interfaces that can be attached to a cloud server is limited. If the cloud server specifications support supplementary network interfaces, you can attach supplementary network interfaces to the elastic network interfaces as needed.
Supplementary network interfaces are attached to VLAN subinterfaces of elastic network interfaces. You can attach multiple supplementary network interfaces to a cloud server. Each supplementary network interface belongs to a different subnet in the same VPC. They have dedicated private IP addresses and EIPs and process the internal, external, and management traffic of the cloud server. You can configure access control policies and routes for each subnet, and define security group rules for each supplementary network interface to isolate networks and service traffic.
Figure 1 shows the attachment relationship. Both the primary and extended network interfaces of an ECS can have supplementary network interfaces attached. In this example, the cloud server has one primary network interface and four extended network interfaces. If the number of elastic network interfaces that can be attached to a cloud server reaches the upper limit, you can attach supplementary network interface 01 to the primary network interface, supplementary network interface 02 to extended network interface 01, and supplementary network interfaces 03 and 04 to extended network interface 04. So there are four supplementary network interfaces. Elastic network interfaces and supplementary network interfaces can be in different subnets. In this example, supplementary network interface 04 and extended network interface 04 are in Subnet-A03, but supplementary network interface 03 is in Subnet-A01.
Managing Supplementary Network Interfaces
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