Assigning an EIP

Scenarios

You can assign an EIP and bind it to cloud resources to allow them to access the Internet.

If you want to assign a pay-per-use EIP that you have released or assign a specific pay-per-use EIP, you can use APIs. When assigning an EIP, set the value of ip_address to the IP address that you want to assign. For details, see Elastic IP API Reference.

If the EIP has been assigned to another user, you will fail to assign your required EIP.
You cannot use APIs to assign a yearly/monthly EIP that you have released or assign a specific yearly/monthly EIP.
The management console does not support assigning a specific EIP.

Procedure

Go to the Buy EIP page.

Set the parameters as prompted.

Figure 1 Assigning an EIP

**Table 1** Parameter descriptions
Parameter	Description	Example Value
Billing Mode	The following billing modes are available: Yearly/Monthly Pay-per-use	Pay-per-use
Region	Regions are geographic areas that are physically isolated from each other. The networks inside different regions are not connected to each other, so resources cannot be shared across different regions. For lower network latency and faster access to your resources, select the region nearest you. The region selected for the EIP is its geographical location. NOTE: The geographical location of an EIP purchased in CN North-Ulanqab1 is Beijing.	CN-Hong Kong
EIP Type	Dynamic BGP: Dynamic BGP provides automatic failover and chooses the optimal path when a network connection fails. Static BGP: Static BGP offers more routing control and protects against route flapping, but an optimal path cannot be selected in real time when a network connection fails. Premium BGP: Premium BGP chooses the optimal path and ensures low-latency and high-quality networks. BGP is used to interconnect with lines of multiple mainstream carriers. Public network connections that feature low latency and high quality are directly established between Chinese mainland and Hong Kong (China). (This parameter is available only in CN-Hong Kong.) EIP Pool: This parameter is available only when you set Billing Mode to Pay-per-use. An EIP pool helps you manage a large number of EIPs and assigns EIPs with dynamic BGP routing, ensuring network stability and optimal user experience. For details, see What Are the Differences Between Static BGP and Dynamic BGP?	Dynamic BGP
EIP Pool	Select your purchased EIP pool. This parameter is available only when Billing Mode is set to Pay-per-use and EIP Type set to EIP Pool.	eipPool-test
Billed By	This parameter is available only when you set Billing Mode to Pay-per-use. Bandwidth: You specify a maximum bandwidth and pay for the amount of time you use the bandwidth. This is suitable for scenarios with heavy or stable traffic. Traffic: You specify a maximum bandwidth and pay for the total traffic you use. This is suitable for scenarios with light or sharply fluctuating traffic. Shared Bandwidth: The bandwidth can be shared by multiple EIPs. This is suitable for scenarios with staggered traffic.	Bandwidth
Bandwidth	The bandwidth size in Mbit/s.	100
DDoS Protection	Cloud Native Anti-DDoS Basic Cloud Native Anti-DDoS Basic provides up to 5 Gbit/s of DDoS mitigation capacity. If the attack to an EIP exceeds 5 Gbit/s, the EIP will be blocked.	N/A
EIP Name	The EIP name. The name can contain a maximum of 64 characters, which may consist of letters, digits, underscores (_), hyphens (-), and periods (.). The name cannot contain spaces.	eip-test
Enterprise Project	The enterprise project that the EIP belongs to. An enterprise project facilitates project-level management and grouping of cloud resources and users. The name of the default project is default. For details about creating and managing enterprise projects, see the Enterprise Management User Guide.	default
Advanced Settings	Click the drop-down arrow to configure parameters, including the bandwidth name and tag.	N/A
Bandwidth Name	The name of the bandwidth.	bandwidth
Tag	The EIP tags. Each tag contains a key and value pair. The tag key and value must meet the requirements listed in Table 2. NOTE: If your organization has created a tag policy for EIP, you need to add tags for EIP based on the tag policy. If a tag does not comply with the tagging rules, the creation may fail. Contact the organization administrator to learn details about the tag policy.	Key: Ipv4_key1 Value: 3005eip
Monitoring	Used to monitor the EIP and enabled by default. You can use the management console or APIs provided by Cloud Eye to query the metrics and alarms generated for the EIP and bandwidth.	N/A
Required Duration	The duration for which the purchased EIP will use. The duration must be specified if the Billing Mode is set to Yearly/Monthly.	1 month
Auto-renew	Whether to select Auto-renew. You can select it if the Billing Mode is set to Yearly/Monthly. The auto-renewal period is determined by the required duration. Monthly subscription: The subscription is renewed every month. Yearly subscription: The subscription is renewed each year.	N/A
Quantity	The number of EIPs you want to purchase. The quantity must be specified if the Billing Mode is set to Pay-per-use.	1

**Table 2** EIP tag requirements
Parameter	Requirement	Example Value
Key	Cannot be left blank. Must be unique for each EIP. Can contain a maximum of 36 characters. Can contain letters, digits, underscores (_), and hyphens (-).	Ipv4_key1
Value	Can contain a maximum of 43 characters. Can contain letters, digits, underscores (_), periods (.), and hyphens (-).	eip-01

If you are buying an EIP billed on a pay-per-use basis and you want to use a shared bandwidth, you can only select an existing shared bandwidth from the Bandwidth Name drop-down list. If there are no shared bandwidths to select, purchase a shared bandwidth first.
A dedicated bandwidth cannot be changed to a shared bandwidth and vice versa. However, you can purchase a shared bandwidth for pay-per-use EIPs.
- After an EIP is added to a shared bandwidth, the EIP will use the shared bandwidth.
- After an EIP is removed from the shared bandwidth, the EIP will use the dedicated bandwidth.