Help Center/ Elastic Load Balance/ Drawer/ Buying a Load Balancer/ EIP
Updated on 2025-07-25 GMT+08:00
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EIP

Description

The Elastic IP (EIP) service provides static public IP addresses that enable your cloud resources to communicate with the Internet. You can bind an EIP to your load balancer to distribute requests over the Internet.

Table 1 EIP configurations

Parameter

Description

EIP
  • Auto assign: A new EIP will be assigned to the load balancer.
  • Use existing: Select an existing EIP for the load balancer.
  • Not required: You can bind an EIP to the load balancer later.

Bandwidth Type

Specify the link type (BGP) when a new EIP is used by referring to What Are the Differences Between Static BGP and Dynamic BGP?

  • Dynamic BGP: If there are changes on a network using dynamic BGP, routing protocols provide automatic, real-time optimization of network configurations, ensuring network stability and optimal user experience.

    This option works well for workloads that require higher network stability and connectivity, such as financial transactions, online games, large-scale enterprise applications, and livestreaming services.

  • Static BGP: If there are changes on a network using static BGP, carriers cannot adjust network configurations in real time to ensure optimal user experience.

    This is a more cost-effective option for workloads that are running in relatively stable networks and have disaster recovery setups.

  • EIP Pool: EIPs with dynamic BGP routing will be assigned, ensuring network stability and optimal user experience.

Billed By

Specify how the bandwidth will be billed by referring to EIP Billing.

  • Bandwidth: You specify the maximum bandwidth and pay for the amount of time you use the bandwidth. This works well for workloads with heavy or stable traffic.
  • Traffic: You specify a maximum bandwidth and pay for the outbound traffic you use. This suits workloads with low but fluctuating traffic.
  • Shared Bandwidth: Load balancers that have EIPs bound in the same region can share the selected bandwidth, helping you reduce public network bandwidth costs.

Bandwidth

Specify the maximum bandwidth.

FAQ

When Do I Need EIP Bandwidth for ELB?

  • To access a load balancer over the Internet, you need to bind an EIP to the load balancer and set a bandwidth when buying the EIP.
  • If you access the load balancer within a VPC, no bandwidth is required.
  • If you access backend servers through their EIPs, the EIP and bandwidth of the load balancer are not used.

Is an EIP Assigned Exclusively to a Load Balancer?

An EIP can be bound to only one cloud resource at a time. The EIP is exclusively used by your load balancer.

The EIP can be unbound from the load balancer. If the EIP is unbound, the EIP can be bound to other resources.

Do I Need to Configure EIP Bandwidth for My Load Balancers?

  • You only need to bind an EIP and configure bandwidth if you are using a load balancer on a public network.
  • If you use a load balancer on a private network, you do not need to configure EIP bandwidth.
Parent Topic: Buying a Load Balancer