This is a debug field for IGMP. Setting bits
cause igmp to gernerate certain log messages.
This field will NOT restart IGMP.
The follow bits maybe set in any combination
(LS stands for least significant):
0x00000001 for received IGMP protocol (join/leave) packets
0x00000002 for sent IGMP messages
0x00000004 for received mcast protocl packets
0x00000008 for MTRACE related log messages
0x00000010 for configuration related log messages
0x00000020 for interaction with mcast protocols
0x00000040 for interaction with RSVP
0x00000080 for MTM forwarding cache related log messages
0x00000100 for IGMP Relay related log messages