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Beginner

How do I know if I need IGMP?

I work at a datacenter where we run many applications and many backups.  There is no music/video streaming but there are so many applications I'm sure one of them is using multicast.  How can I tell if I need to enable IGMP snooping?  Would there be any unwanted side effects if I enabled IGMP?

Vlan Id                                            : 110

L2 Unicast Packets                                 : 304283703

L2 Unicast Octets                                  : 135592854659

L3 Input Unicast Packets                           : 0

L3 Input Unicast Octets                            : 0

L3 Output Unicast Packets                          : 0

L3 Output Unicast Octets                           : 0

L3 Output Multicast Packets                        : 0

L3 Output Multicast Octets                         : 0

L3 Input Multicast Packets                         : 0

L3 Input Multicast Octets                          : 0

L2 Multicast Packets                               : 1462071

L2 Multicast Octets                                : 126453949

Vlan Id                                            : 111

L2 Unicast Packets                                 : 8018368

L2 Unicast Octets                                  : 6383169343

L3 Input Unicast Packets                           : 0

L3 Input Unicast Octets                            : 0

L3 Output Unicast Packets                          : 0

L3 Output Unicast Octets                           : 0

L3 Output Multicast Packets                        : 0

L3 Output Multicast Octets                         : 0

L3 Input Multicast Packets                         : 0

L3 Input Multicast Octets                          : 0

L2 Multicast Packets                               : 229599

L2 Multicast Octets                                : 19349384

Vlan Id                                            : 112

L2 Unicast Packets                                 : 1214444

L2 Unicast Octets                                  : 1242659763

L3 Input Unicast Packets                           : 0

L3 Input Unicast Octets                            : 0

L3 Output Unicast Packets                          : 0

L3 Output Unicast Octets                           : 0

L3 Output Multicast Packets                        : 0

L3 Output Multicast Octets                         : 0

L3 Input Multicast Packets                         : 0

L3 Input Multicast Octets                          : 0

L2 Multicast Packets                               : 186106

L2 Multicast Octets                                : 16563384

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Advisor

How do I know if I need IGMP?

Hi,

as far as I know IGMP snooping is only beneficial when you have got L3 multicast in your network which doesn't seem the case here as we only see L2 multicast packets on the switch. It may be CDP,STP,VTP but L2 multicast only is not using IGMP so no need for IGMP snooping.

Regards.

Alain

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