MgmGetProtocolOnInterface function (mgm.h)

The MgmGetProtocolOnInterface function retrieves the protocol ID of the multicast routing protocol that owns the specified interface.

Syntax

DWORD MgmGetProtocolOnInterface(
  [in]      DWORD  dwIfIndex,
  [in]      DWORD  dwIfNextHopAddr,
  [in, out] PDWORD pdwIfProtocolId,
  [in, out] PDWORD pdwIfComponentId
);

Parameters

[in] dwIfIndex

Specifies the index of the interface for which to retrieve the protocol ID.

[in] dwIfNextHopAddr

Specifies the address of the next hop that corresponds to the index specified by dwIfIndex. The dwIfIndex and dwIfNextHopIPAddr parameters uniquely identify a next hop on point-to-multipoint interfaces. A point-to-multipoint interface is a connection where one interface connects to multiple networks. Examples of point-to-multipoint interfaces include non-broadcast multiple access (NBMA) interfaces and the internal interface on which all dial-up clients connect.

For broadcast interfaces (such as Ethernet interfaces) or point-to-point interfaces, which are identified by only the value of dwIfIndex, specify zero.

[in, out] pdwIfProtocolId

On input, the client must supply a pointer to a DWORD-sized memory location.

On output, pdwIfProtocolId receives the ID of the protocol on the interface specified by dwIfIndex.

[in, out] pdwIfComponentId

On input, the client must supply a pointer to a DWORD value.

On output, pdwIfComponentId receives the component ID for the instance of the protocol on the interface. This parameter is used with pdwIfProtocolId to uniquely identify an instance of a routing protocol.

Return value

If the function succeeds, the return value is NO_ERROR.

If the function fails, the return value is one of the following error codes.

Requirements

See also

MgmReleaseInterfaceOwnership

MgmTakeInterfaceOwnership