ModifyPrefixList - Elastic Compute Service

Modifies the name, description, or entries of a specific prefix list.

Operation description

Usage notes

The specified CIDR block must be valid. For example, 10.0.0.0/8 is a valid CIDR block while 10.0.0.1/8 is not. For more information, see the What is CIDR? section in the "Network FAQ" topic.
When you add or delete an entry, you cannot specify duplicate CIDR blocks. Examples:
- For IPv4 CIDR blocks, you cannot specify the 10.0.0.0/8 CIDR block in two entries. You cannot specify the 10.0.0.1/32 CIDR block in one entry and the 10.0.0.1 CIDR block in another entry. The two CIDR blocks are the same.
- For IPv6 CIDR blocks, you cannot specify the 2001:fd01:0:0:0:0:0:0/32 CIDR block in one entry and the 2001:fd01::/32 CIDR block in another entry. The two CIDR blocks are the same.
The CIDR block in an entry to be added cannot the same as that in an entry to be deleted. For example, when you add an entry in which the 10.0.0.0/8 CIDR block is specified, make sure that the 10.0.0.0/8 CIDR block is not specified in an entry to be deleted.
If you want to modify the description of an entry, you must specify the CIDR block (AddEntry.N.Cidr) and new description (AddEntry.N.Description) for the entry.

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
ecs:ModifyPrefixList	update	PrefixList acs:ecs:{#regionId}:{#accountId}:prefixlist/{#PrefixListId}	none	none

Request parameters

Parameter	Type	Required	Description	Example
RegionId	string	Yes	The region ID of the prefix list. You can call the DescribeRegions operation to query the most recent region list.	cn-chengdu
PrefixListId	string	Yes	The ID of the prefix list.	pl-x1j1k5ykzqlixdcy****
PrefixListName	string	No	The name of the prefix list. The name must be 2 to 128 characters in length. It must start with a letter and cannot start with `http://`, `https://`, `com.aliyun`, or `com.alibabacloud`. The name can contain letters, digits, colons (:), underscores (_), periods (.), and hyphens (-).	PrefixListNameSample
Description	string	No	The description of the prefix list. The description must be 2 to 256 characters in length and cannot start with `http://` or `https://`.	This is description.
AddEntry	array<object>	No	The entries to be added to the prefix list.
	object	No
Description	string	No	The description in entry N. The description must be 2 to 32 characters in length and cannot start with `http://` or `https://`. Valid values of N: 0 to 200.	Description Sample 01
Cidr	string	Yes	The CIDR block in entry N to be added to the prefix list. Valid values of N: 0 to 200. Take note of the following items when you add the entries: The total number of entries in the prefix list cannot exceed the maximum number of entries you specified for the prefix list. You can call the DescribePrefixListAttributes operation to query the maximum number of entries that the prefix list can contain. You cannot specify duplicate CIDR blocks. The CIDR blocks cannot be the same as the `RemoveEntry.N.Cidr` values.	192.168.2.0/24
RemoveEntry	array<object>	No	The entries to be deleted from the prefix list.
	object	No
Cidr	string	Yes	The CIDR block in entry N to be deleted from the prefix list. Valid values of N: 0 to 200. Take note of the following items when you delete the entries: You cannot specify duplicate CIDR blocks. The CIDR blocks cannot be the same as the `AddEntry.N.Cidr` values.	192.168.1.0/24

Response parameters

Parameter	Type	Description	Example
	object
RequestId	string	The request ID.	38793DB8-A4B2-4AEC-BFD3-111234E9188D

Examples

Sample success responses

JSONformat

{
  "RequestId": "38793DB8-A4B2-4AEC-BFD3-111234E9188D"
}

Error codes

HTTP status code	Error code	Error message	Description
400	MissingParameter	%s	A parameter is not specified.
400	InvalidParameter.PrefixListName	The parameter PrefixListName is not valid.	The prefix list name is invalid.
400	InvalidDescription.Malformed	The specified Description is wrongly formed.	The resource description is invalid. The description must be 2 to 256 characters in length and cannot start with http:// or https://.
400	InvalidParameter.CidrDuplicated	%s	Duplicate CIDR blocks are specified.
400	InvalidParameter.CidrMalformed	%s	The specified CIDR block is invalid.
400	LimitExceed.MaxEntries	The number of entries exceeds the MaxEntries of the specified prefix list.	The number of specified entries exceeds the MaxEntries value.
400	LimitExceed.Entry	The number of entries added or removed exceeds the limit.	The number of entries to add or remove at a time exceeds the upper limit.
404	InvalidPrefixListId.NotFound	The specified prefix list was not found.	The prefix list does not exist.
404	InvalidRegionId.NotFound	The specified RegionId does not exist.	The specified region ID does not exist.

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

Change history

Change time	Summary of changes	Operation
2023-11-13	The Error code has changed	View Change Details