Anycast elastic IP addresses (Anycast EIPs) serve as fixed ingresses on applications hosted on Alibaba Cloud. You can use Anycast EIPs in combination with high-bandwidth BGP lines and the global network of Alibaba Cloud. This allows users across the globe to access services through the nearest access point with a low network latency.

Network architecture

An Anycast EIP is a public IP address that you can purchase and use as an independent resource. After you purchase an Anycast EIP, the system allocates a public IP address to the Anycast EIP. The public IP address can be announced from all access point locations. After you associate the Anycast EIP with an endpoint, user traffic can be routed from the nearest access point to Alibaba Cloud. Network traffic is automatically routed to the associated endpoint through the optimal route. You do not need to configure routes. This offers a consistent user experience when users in different regions access endpoints on Alibaba Cloud.

Components

The following table describes the components of an Anycast EIP.

Component Description
Access area The access point locations where users can access Alibaba Cloud.

Anycast EIPs can be anycast from all access point locations outside the Chinese mainland.

IP address The public IP address that is used to access the endpoints on Alibaba Cloud.

After you create an Anycast EIP, the system automatically allocates a public IP address to the Anycast EIP. Users can use the Anycast EIP to access the associated endpoint on Alibaba Cloud through the nearest access point.

Access point An access point serves as an ingress through which network traffic is routed to Alibaba Cloud. Each access point is a point of presence (PoP) or a region of Alibaba Cloud. For more information, see Access point locations.
Origin server region The region where the endpoint is deployed.
An Anycast EIP can be associated with a Classic Load Balancer (CLB) instance or an elastic network interface (ENI) in the China (Hong Kong), Singapore (Singapore), US (Silicon Valley), US (Virginia), or Germany (Frankfurt) region.
Note The CLB instance must be a CLB instance that is deployed in a virtual private cloud (VPC).

Access point locations

The following table describes the access point locations from which an Anycast EIP can be announced.
Area Region
Asia Pacific China (Hong Kong), Singapore (Singapore), India (Mumbai), Thailand (Bangkok), Philippines (Manila), Vietnam (Ho Chi Minh), South Korea (Seoul), Japan (Tokyo), Malaysia (Kuala Lumpur), and Indonesia (Jakarta)
North America US (Silicon Valley), US (Virginia), and US (Chicago)
South America Brazil (Sao Paulo)
Europe UK (London),Germany (Frankfurt), Spain (Madrid), and France (Paris)
Australia Australia (Sydney)
Note
  • Anycast EIPs can be used only in regions outside the Chinese mainland. You cannot use Anycast EIPs in the Chinese mainland.
  • The information in the preceding table is for reference only. Alibaba Cloud may update the access point information in the table without sending notifications to you. Alibaba Cloud may update the access point list when a specific event occurs. For example, Alibaba Cloud updates the list when an access device is down for maintenance, an access device fails, a new access point is added, or an existing access point is removed.

Benefits

  • Ease of use
    Anycast EIPs allow Internet access, which is similar to EIPs. Therefore, after you associate an Anycast EIP with a Server Load Balancer (SLB) instance, the SLB instance can use the Anycast EIP to provide services over the Internet. No further configurations are required. This improves the efficiency of workload deployment.
  • High security
    Anycast EIPs use cloud-native security technologies to protect your Internet-facing services from attacks. The security of the backend server is reinforced.
  • Stability and reliability
    Each Anycast EIP supports connections from multiple PoPs. When one of the access points is down, network traffic is routed to another access point. This ensures high reliability.
  • Reduced network jitter
    Anycast EIP allows you to connect to Alibaba Cloud through the nearest PoP. You can use the high-quality BGP bandwidth and global network provided by Alibaba Cloud to access the backend server with which the Anycast EIP is associated. This reduces network jitter in Internet connections.