History

• IGMPv1

• • Published in 1989 as RFC 1112
  • Support for two messages
  • • Membership Report
    • Membership Query
  • Soft state

• IGMPv2

• • Published in 1997 as RFC 2236
  • Support for four messages
  • • Membership Report (2 types, v1 and v2)
    • Membership Query
    • Leave

• IGMPv3

• • Published in 2002 as RFC 3376
  • More messages and new packet formats