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MGM_IF_ENTRY structure (mgm.h)

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The MGM_IF_ENTRY structure describes a router interface. This structure is used in the PMGM_CREATION_ALERT_CALLBACK. In the context of this callback, the routing protocol must enable or disable multicast forwarding on each interface, notifying the multicast group manager by using the bIsEnabled member.

Syntax

typedef struct _MGM_IF_ENTRY {
  DWORD dwIfIndex;
  DWORD dwIfNextHopAddr;
  BOOL  bIGMP;
  BOOL  bIsEnabled;
} MGM_IF_ENTRY, *PMGM_IF_ENTRY;

Members

dwIfIndex

Specifies the index of the interface.

dwIfNextHopAddr

Specifies the address of the next hop that corresponds to the index specified by dwIfIndex. The dwIfIndex and dwIfNextHopIPAddr members 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.

bIGMP

Indicates whether or not IGMP is enabled on this interface. If bIGMP is TRUE, then IGMP is enabled on this interface. If bIGMP is FALSE, then IGMP is not enabled on this interface.

bIsEnabled

Indicates whether or not multicast forwarding is enabled on this interface. If bIsEnabled is TRUE, multicast forwarding is enabled on this interface. If bIsEnabled is FALSE, multicast forwarding is disabled on this interface.

Requirements

Requirement Value
Minimum supported client None supported
Minimum supported server Windows 2000 Server [desktop apps only]
Header mgm.h

See also

PMGM_CREATION_ALERT_CALLBACK