CreateVSwitchCidrReservation - Virtual Private Cloud - Alibaba Cloud Documentation Center

Creates a reserved CIDR block for a vSwitch.

Operation description

Description

Take note of the following items:

You can create at most 10 reserved IPv4 CIDR blocks and 10 reserved IPv6 CIDR blocks for each vSwitch in a virtual private cloud (VPC).
After you create a reserved CIDR block for a vSwitch, the CIDR block cannot contain the IP address of the subnet gateway of the VPC to which the vSwitch belongs.
CreateVSwitchCidrReservation is an asynchronous operation. After a request is sent, the system returns a request ID and runs the task in the background. You can call ListVSwitchCidrReservations to query the status of the task:
- If the vSwitch is in the Assigning state, the reserved CIDR block is being created.
- If the vSwitch is in the Assigned state, the reserved CIDR block is created.
When you create a reserved IPv4 CIDR block for a vSwitch, the first IP address and the last three IP addresses of the vSwitch are reserved by the system. The four IP addresses will not be allocated.
When you create a reserved IPv6 CIDR block for a vSwitch, the first IP address and the last nine IP addresses of the vSwitch are reserved by the system. The 10 IP addresses will not be allocated. For example, if you create a reserved IPv4 CIDR block for a vSwitch whose CIDR block is 192.168.1.0/24, the reserved CIDR block cannot contain the following IP addresses: 192.168.1.0, 192.168.1.253, 192.168.1.254, and 192.168.1.255.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

Debug

Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

Operation: the value that you can use in the Action element to specify the operation on a resource.
Access level: the access level of each operation. The levels are read, write, and list.
Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- The required resource types are displayed in bold characters.
- If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
Condition Key: the condition key that is defined by the cloud service.
Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.

Operation	Access level	Resource type	Condition key	Associated operation
vpc:CreateVSwitchCidrReservation	create	VSwitchCidrReservation acs:vpc:{#regionId}:{#accountId}:vswitchcidrreservation/*	none	none

Request parameters

Parameter	Type	Required	Description	Example
Tag	array<object>	No	Resource tags
	object	No
Key	string	No	The key of tag N to add to the resource. You can specify at most 20 tag keys. The tag key cannot be an empty string. The tag key can be up to 128 characters in length. It cannot start with aliyun or acs:, and cannot contain http:// or https://.	FinanceDept
Value	string	No	The value of tag N to add to the resource. You can specify at most 20 tag values. The tag value can be an empty string. The tag value can be up to 128 characters in length and cannot start with acs: or aliyun. It cannot contain http:// or https://.	FinanceJoshua
VSwitchId	string	Yes	The ID of the vSwitch to which the reserved CIDR block belongs.	vsw-25navfgbue4g****
VSwitchCidrReservationName	string	No	The name of the reserved CIDR block. The name must be 2 to 128 characters in length and can contain digits, underscores (_), and hyphens (-). It must start with a letter.	ReservationName
VSwitchCidrReservationDescription	string	No	The description of the reserved CIDR block. This parameter is empty by default. The description must be 2 to 256 characters in length. It must start with a letter and cannot start with `http://` or `https://`.	ReservationDescription
IpVersion	string	No	The IP version of the reserved CIDR block. Valid values: IPv4 (default) IPv6	IPv4
VSwitchCidrReservationMask	string	No	The subnet mask of the reserved CIDR block. When IpVersion is set to IPv4, the subnet mask length of the CIDR block must be greater than the IPv4 subnet mask length of the vSwitch and cannot be greater than 28. When IpVersion is set to IPv6, the subnet mask length of the CIDR block must be greater than the IPv6 subnet mask length of the vSwitch and cannot be greater than 80. Note You must specify one of VSwitchCidrReservationMask and VSwitchCidrReservationCidr.	28
VSwitchCidrReservationCidr	string	No	The reserved CIDR block of the vSwitch. When IpVersion is set to IPv4, the reserved CIDR block must be a proper subset of the IPv4 CIDR block of the vSwitch and the subnet mask length of the reserved CIDR block cannot be greater than 28. When IpVersion is set to IPv6, the reserved CIDR block must be a proper subset of the IPv6 CIDR block of the vSwitch and the subnet mask length of the reserved CIDR block cannot be greater than 80. Note You must specify one of VSwitchCidrReservationMask and VSwitchCidrReservationCidr.	192.168.1.64/28
VSwitchCidrReservationType	string	No	The type of reserved CIDR block. Set the value to prefix. Note When a user or a cloud service allocates a CIDR block to an elastic network interface (ENI), the CIDR block must be allocated from the reserved CIDR block. If the reserved CIDR block is exhausted, an error is returned.	prefix
ClientToken	string	No	The client token that is used to ensure the idempotence of the request. You can use the client to generate the token, but you must make sure that the token is unique among different requests. The token can contain only ASCII characters. Note If you do not specify this parameter, the system automatically uses the request ID as the client token. The request ID may be different for each request.	123e4567-e89b-12d3-a456-426655440000
DryRun	boolean	No	Specifies whether to perform only a dry run, without performing the actual request. Valid values: true: performs only a dry run, without performing the actual request. The system checks the request for potential issues, including missing parameter values, incorrect request syntax, and service limits. If the request fails the dry run, an error message is returned. If the request passes the dry run, the `DryRunOperation` error code is returned. false (default): performs a dry run and performs the actual request. If the request passes the dry run, a 2xx HTTP status code is returned and the operation is performed.	false
RegionId	string	Yes	The ID of the region where the vSwitch is deployed. You can call the DescribeRegions operation to query the most recent region list.	cn-hangzhou

Response parameters

Parameter	Type	Description	Example
	object	The ID of the reserved CIDR block.
VSwitchCidrReservationId	string	The ID of the reserved CIDR block.	vcr-bp1m12saqteraw3rp****
RequestId	string	The request ID.	54B48E3D-DF70-471B-AA93-08E683A1B45

Examples

Sample success responses

JSONformat

{
  "VSwitchCidrReservationId": "vcr-bp1m12saqteraw3rp****",
  "RequestId": "54B48E3D-DF70-471B-AA93-08E683A1B45"
}

Error codes

HTTP status code	Error code	Error message	Description
400	IllegalParamFormat	IllegalParamFormat	The parameter format is invalid.
400	IllegalParamFormat.VSwitchCidrReservationCidr	The param format of VSwitchCidrReservationCidr is illegal.	The VSwitchCidrReservationCidr value is invalid.
400	ResourceNotFound.VSwitch	The specified resource of VSwitch is not found.	The specified vSwitch does not exist.
400	UnsupportedFeature.ReservedType	The specified ReservedType is not supported.	The ReservedType value is invalid.
400	UnsupportedFeature.VSwitchIpv6	The ipv6 feature of switch is not supported.	IPv6 is not enabled for the specified vSwitch.
400	OperationFailed.VSwitchCidrReservationCidr	The specified VSwitchCidrReservationCidr conflicts with existed cidr reservation or vswitch cidr.	The VSwitchCidrReservationCidr value conflicts with an existing VSwitchCidrReservation value.
400	MissingParam.CidrReservationMaskOrCidrReservationCidr	Either VSwitchCidrReservationMask or VSwitchCidrReservationCidr should be specified.	You cannot leave both the VSwitchCidrReservationMask and VSwitchCidrReservationCidr parameters empty. Set a value and try again.
400	IllegalParam.VSwitchCidrReservationMask	The specified VSwitchCidrReservationMask must be greater than the VSwitch mask + 2.	VSwitchCidrReservationMask must be at least 3 bits greater than the vSwitch mask.
400	UnsupportedRegion	UnsupportedRegion	The error message returned because the current region does not support this feature.
400	UnsupportedFeature.VpcAdvancedFeature	UnsupportedFeature.VpcAdvancedFeature	The error message returned because the VPC where the specified vSwitch is deployed does not support advanced VPC features. Specify another vSwitch and try again.
400	QuotaExceeded.VSwitchCidrReservationMask	The quota of VSwitchCidrReservationMask is exceeded.	The VSwitchCidrReservationMask value exceeds the upper limit. Adjust the value and try again.
400	QuotaExceeded.CidrReservationCount	The quota of VSwitchCidrReservation is exceeded.	The VSwitchCidrReservation value exceeds the upper limit.
400	Conflict.CidrReservationMaskAndCidrReservationCidr	The specified VSwitchCidrReservationMask and VSwitchCidrReservationCidr is conflict.	The VSwitchCidrReservationMask value conflicts with the VSwitchCidrReservationCidr value. Adjust the values and try again.
400	OperationFailed.CidrNotEnoughInVSwitch	No enough cidr to allocate in this vswitch.	The specified vSwitch does not have sufficient CIDR blocks.
400	OperationFailed.SystemReservedIpContained	The specified VSwitchCidrReservationCidr cannot contain system reserved IP addresses.	VSwitchCidrReservationCidr cannot contain a reserved IP address.
400	OperationFailed.AlreadyUsedIpContained	The specified VSwitchCidrReservationCidr cannot contain already used IP addresses.	The reserved CIDR block cannot contain used IP addresses.
400	IncorrectStatus.VSWITCH	The status of the specified VSwitch is invalid.	The status of the specified VSwitch is invalid.

For a list of error codes, visit the Service error codes.

Change history

Change time	Summary of changes	Operation
2023-11-27	The Error code has changed	View Change Details