NSX-T Data Center REST API

Update VPC Attachment

Each VPC has one attachment. This API will update the VPC attachment.

**IMPORTANT WARNING for Connectivity Profile Changes:** When changing the
vpc_connectivity_profile field, this operation may cause immediate traffic disruption:

• **Auto SNAT Changes**: If switching between connectivity profiles with different
"Default Outbound NAT" settings (enabled vs disabled), existing auto SNAT rules
will be deleted and new ones may be created. This can break outbound connectivity
for private subnets during the transition.

• **External IP Block Changes**: If the new connectivity profile uses different
external IP blocks, existing SNAT IP allocations will be released and new ones
allocated, potentially changing translated IP addresses.

• **Transit Gateway Changes**: Switching to a connectivity profile with a different
transit gateway will update routing paths and may cause temporary connectivity loss.

**Best Practices:**
1. Plan for potential downtime during the profile transition
2. Test connectivity profile changes in non-production environments first

Request:

Method:

PATCH

URI Path(s):

/policy/api/v1/orgs/{org-id}/projects/{project-id}/vpcs/{vpc-id}/attachments/{vpc-attachment-id}

Request Headers:

n/a

Query Parameters:

n/a

Request Body:

VpcAttachment+

VpcAttachment (schema)

Name	Description	Type	Notes
_create_time	Timestamp of resource creation	EpochMsTimestamp	Readonly Sortable
_create_user	ID of the user who created this resource	string	Readonly
_last_modified_time	Timestamp of last modification	EpochMsTimestamp	Readonly Sortable
_last_modified_user	ID of the user who last modified this resource	string	Readonly
_links	References related to this resource The server will populate this field when returing the resource. Ignored on PUT and POST.	array of ResourceLink	Readonly
_protection	Indicates protection status of this resource Protection status is one of the following: PROTECTED - the client who retrieved the entity is not allowed to modify it. NOT_PROTECTED - the client who retrieved the entity is allowed to modify it REQUIRE_OVERRIDE - the client who retrieved the entity is a super user and can modify it, but only when providing the request header X-Allow-Overwrite=true. UNKNOWN - the _protection field could not be determined for this entity.	string	Readonly
_revision	Generation of this resource config The _revision property describes the current revision of the resource. To prevent clients from overwriting each other's changes, PUT operations must include the current _revision of the resource, which clients should obtain by issuing a GET operation. If the _revision provided in a PUT request is missing or stale, the operation will be rejected.	int
_schema	Schema for this resource	string	Readonly
_self	Link to this resource	SelfResourceLink	Readonly
_system_owned	Indicates system owned resource	boolean	Readonly
children	Subtree for this type within policy tree Subtree for this type within policy tree containing nested elements. Note that this type is applicable to be used in Hierarchical API only.	array of ChildPolicyConfigResource Children are not allowed for this type
description	Description of this resource	string	Maximum length: 1024 Sortable
display_name	Identifier to use when displaying entity in logs or GUI Defaults to ID if not set	string	Maximum length: 255 Sortable
id	Unique identifier of this resource	string	Sortable
marked_for_delete	Indicates whether the intent object is marked for deletion Intent objects are not directly deleted from the system when a delete is invoked on them. They are marked for deletion and only when all the realized entities for that intent object get deleted, the intent object is deleted. Objects that are marked for deletion are not returned in GET call. One can use the search API to get these objects.	boolean	Readonly Default: "False"
origin_site_id	A unique identifier assigned by the system for knowing which site owns an object This is a UUID generated by the system for knowing which site owns an object. This is used in NSX+.	string	Readonly
overridden	Indicates whether this object is the overridden intent object Global intent objects cannot be modified locally by the user. However, certain global intent objects can be overridden locally by use of this property. In such cases, the overridden local values take precedence over the globally defined values for the properties.	boolean	Readonly Default: "False"
owner_id	A unique identifier assigned by the system for the ownership of an object This is a UUID generated by the system for knowing who owns this object. This is used in NSX+.	string	Readonly
parent_path	Path of its parent Path of its parent	string	Readonly
path	Absolute path of this object Absolute path of this object	string	Readonly
preferred_default_snat_ip	Preferred Default SNAT IP The preferred default SNAT translated IP for VPC auto SNAT rules. The IP should be available (free), otherwise the create/update operation with this field will fail; The field can be empty / null, in which case the system will allocate an IP from available external IP blocks to use for VPC auto SNAT rule translated IPs.	IPAddress
realization_id	A unique identifier assigned by the system for realizing intent This is a UUID generated by the system for realizing the entity object. In most cases this should be same as 'unique_id' of the entity. However, in some cases this can be different because of entities have migrated their unique identifier to NSX Policy intent objects later in the timeline and did not use unique_id for realization. Realization id is helpful for users to debug data path to correlate the configuration with corresponding intent.	string	Readonly
relative_path	Relative path of this object Path relative from its parent	string	Readonly
remote_path	Path of the object on the remote end. This path is populated only in case of multi-site scenario. Currently it is supported only for LM objects. When LM is onboarded to multi-site platform like NAPP or GM, remote_path will be set to the globally unique path across multi-site topology . It is generated based on local site-name and uses /org tree namespace. Note: It is populated only for LM objects. Not supported on the GM.	string	Readonly
resource_type	Must be set to the value VpcAttachment	string
tags	Opaque identifiers meaningful to the API user	array of Tag	Maximum items: 30
unique_id	A unique identifier assigned by the system This is a UUID generated by the GM/LM to uniquely identify entities in a federated environment. For entities that are stretched across multiple sites, the same ID will be used on all the stretched sites.	string	Readonly
vpc_connectivity_profile	VPC Connectivity Profile policy path VPC Connectivity Profile policy path	string	Required

Example Request:

PATCH https://<policy-mgr>/policy/api/v1/orgs/default/projects/project-1/vpcs/vpc-1/attachments/vpc-attachment-1 { "vpc_connectivity_profile": "/orgs/default/projects/project-1/vpc-connectivity-profiles/production_vpc1_connectivity_profile" }

Successful Response:

Response Code:

200 OK

Response Headers:

n/a

Response Body:

n/a

Example Response:

200 OK

Required Permissions:

crud

Feature:

policy_vpc_attachment

Additional Errors:

• 301 Moved Permanently
• 307 Temporary Redirect
• 400 Bad Request
• 403 Forbidden
• 409 Conflict
• 412 Precondition Failed
• 500 Internal Server Error
• 503 Service Unavailable