A Hyper-V extensible switch extension issues an object identifier (OID) query request of OID_SWITCH_PORT_ARRAY to obtain an array. Each element in the array specifies the configuration parameters for an extensible switch port.

If the OID query request completes successfully, the InformationBuffer member of the NDIS_OID_REQUEST structure contains a pointer to a buffer. This buffer contains the following data:


The OID_SWITCH_PORT_ARRAY OID must only be issued when the Hyper-V extensible switch has completed activation. Please see Querying the Hyper-V Extensible Switch Configuration for more details.

When the extension handles the returned NDIS_SWITCH_PORT_PARAMETERS structure, it must not assume that the various string members of the NDIS_SWITCH_PORT_PARAMETERS structure, such as PortName, are null-terminated. The data types for these string members are type-defined by the IF_COUNTED_STRING structure. The driver must determine the string length from the value of the Length member of this structure.

Note If the string is null-terminated, the Length member must not include the terminating null character.

Return Status Codes

The underlying miniport edge of the extensible switch completes the OID query request of OID_SWITCH_PORT_ARRAY and returns one of the following status codes.

Status Code Description


The OID request completed successfully.


The length of the information buffer is too small to return the NDIS_SWITCH_PORT_ARRAY and its array of NDIS_SWITCH_PORT_PARAMETERS elements. The underlying miniport edge of the extensible switch sets the DATA.QUERY_INFORMATION.BytesNeeded member in the NDIS_OID_REQUEST structure to the minimum buffer size that is required.


The request failed for other reasons.



Supported in NDIS 6.30 and later.


Ntddndis.h (include Ndis.h)

See also




Querying the Hyper-V Extensible Switch Configuration

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