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Cloud Enterprise Network:RegisterTransitRouterMulticastGroupSources

Last Updated:Aug 12, 2026

Creates multicast sources to implement one-to-many multicast communication.

Operation description

  • Currently, only elastic network interfaces (ENIs) can be specified as multicast sources.

  • RegisterTransitRouterMulticastGroupSources is an asynchronous operation. After you send a request, the system returns a RequestId but the multicast source is not completely created. The creation task is still running in the background. You can call the ListTransitRouterMulticastGroups operation to query the status of the multicast source.

    • If the multicast source is in the Registering state, the multicast source is being created. In this state, you can only query the multicast source but cannot perform other operations.

    • If the multicast source is in the Registered state, the multicast source is created.

Before you begin

Before you invoke the RegisterTransitRouterMulticastGroupSources operation to create a multicast source, make sure that the vSwitch to which the network interface controller (NIC) of the elastic network interfaces (ENIs) belongs is associated with the multicast domain. For more information, see AssociateTransitRouterMulticastDomain.

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

cen:RegisterTransitRouterMulticastGroupSources

create

*TransitRouterMulticastDomain

acs:cen:*:{#accountId}:centransitroutermulticast/{#centransitroutermulticastId}

None None

Request parameters

Parameter

Type

Required

Description

Example

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 client token can contain only ASCII characters.

Note

If you do not specify this parameter, the system automatically uses the RequestId of the API request as the ClientToken. The RequestId may be different for each request.

123e4567-e89b-12d3-a456-4266****

TransitRouterMulticastDomainId

string

Yes

The ID of the multicast domain to which the multicast source belongs.

tr-mcast-domain-5mjb5gjb6dgu98****

GroupIpAddress

string

Yes

The IP address of the multicast group to which the multicast source belongs. Valid values: 224.0.1.0 to 239.255.255.254.

Important 224.0.0.0 to 224.0.0.127 are system reserved IP addresses and cannot be used as multicast group IP addresses.
If the multicast group that you specify does not exist in the current multicast domain, the system automatically creates a new multicast group.

239.XX.XX.2

NetworkInterfaceIds

array

No

The list of network interface controller (NIC) IDs of the elastic network interfaces (ENIs).

string

No

The network interface controller (NIC) ID of the elastic network interfaces (ENIs) (the multicast source).

A maximum of five multicast sources can be created at a time for each multicast group.

Note

This parameter is currently required.

eni-p0w92o2wupc3c05t****

DryRun

boolean

No

Specifies whether to perform a dry run. Valid values:

  • true: performs a dry run. The system checks the required parameters, request syntax, and 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 sends the request. If the request passes the dry run, the multicast source is created.

false

VpcId

string

No

The instance ID of the VPC to which the network interface controller (NIC) of the elastic network interfaces (ENIs) belongs.

  • If the ENI belongs to the same Alibaba Cloud account as the account that you use to logon to the console, you do not need to specify this parameter.

  • If the ENI belongs to a different Alibaba Cloud account from the account that you use to logon to the console, this parameter is required.

vpc-wz9fusm6zq8uy7cfa****

Response elements

Element

Type

Description

Example

object

The response parameters.

RequestId

string

The request ID.

9C5D5D70-0AFF-5E5C-8D8A-E92C90C8FB08

Examples

Success response

JSON format

{
  "RequestId": "9C5D5D70-0AFF-5E5C-8D8A-E92C90C8FB08"
}

Error codes

HTTP status code

Error code

Error message

Description

400 InvalidOperation.PeerMulticastDomainSource Operation is invalid because peer multicast domain can not be group source. The error message returned because you cannot specify a multicast domain in another region as the multicast source.
400 IllegalParam.GroupIpAddress The specified GroupIpAddress is illegal. The error message returned because the GroupIpAddress parameter is set to an invalid value.
400 InvalidMulticastDomainId.NotFound The specified AttachmentId is not found. The error message returned because the specified multicast domain does not exist.
400 IncorrectStatus.MulticastDomainId The status of MulticastDomainId is incorrect. The error message returned because the status of the specified multicast domain does not support this operation. Try again later.
400 IncorrectStatus.Cen The status of Cen is incorrect. The error message returned because the status of the specified CEN instance does not support this operation. Try again later.
400 InstanceExist The instance already exists. The error message returned because the specified instance already exists.
400 InvalidOperation.NetworkInterfaceNotExist Operation is invalid bacause network interface not exist. The error message returned because the network instance does not exist.
400 InvalidOperation.NTRNetworkInterfaceNotSupport Operation is invalid, due to ntr eni not support. The error message returned because the ENI of the transit router cannot be added to the multicast group.
400 InstanceNotExist The instance is not exist. The error message returned because the specified instance does not exist.
400 InvalidOperation.MulticastDomainAssociationNotExist Operation is invalid because multicast association domain association not exist. The error message returned because this operation is not supported when the specified multicast domain is not associated with the specified resource.
400 InvalidOperation.MulticastDomainAssociationStatus Operation is invalid, due to multicast domain association not Active. The error message returned because the status of the specified multicast domain does not support this operation. Try again later.
400 QuotaFull.MulticastGroupPerDomain The number of multicast group has exceed the maximum value that can be created. The error message returned because the number of multicast groups in the multicast domain has reached the upper limit.
400 QuotaFull.MulticastSourcePerGroup The number of multicast group source has exceed the maximum value that can be created. The error message returned because the number of multicast sources in the multicast group has reached the upper limit.
400 DryRunOperation Request validation has been passed with DryRun flag set. The error message returned because the dry run request passed the precheck.
400 IncorrectStatus.ConnectPeerIds Connect Peer statuses are incorrect. Connect Peer statuses are incorrect.
400 InvalidConnectPeerIds.NotFound The Connect Peer Ids are invalid. The Connect Peer Ids are invalid.
400 OperationUnsupported.ExistsIgmpv2MemberOnEni An igmpv2 multicast source or multicast member already exists on the ENI. An igmpv2 multicast source or multicast member already exists on the ENI.
400 QuotaExceeded.SourceAndMemberPerTransitRouter The number of multicast group members and sources has exceed the maximum value that can be created. The number of multicast group members and sources has exceed the maximum value that can be created.
400 InvalidParameter Invalid parameter. The error message returned because the parameter is set to an invalid value.
400 Unauthorized The AccessKeyId is unauthorized. The error message returned because you do not have the permissions to perform this operation.
400 InvalidParameter.TransitRouterMulticastDomainId The specified parameter TransitRouterMulticastDomainId is invalid. The parameter TransitRouterMulticastDomainId entered is illegal.
400 InvalidParameter.ConnectPeerIds The specified parameter ConnectPeerIds is invalid. The parameter ConnectPeerIds entered is illegal.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.