Internet Group Management
Protocol (IGMP)
Internet group management protocol (IGMP) is a Layer 3 multicast protocol that hosts use to join or leave a
multicast group.
Multicast is premised on identifying many hosts by a single destination IP address; hosts represented by the
same IP address are a multicast group. Multicast routing protocols (such as protocol-independent multicast
[PIM]) use the information in IGMP messages to discover which groups are active and to populate the
multicast routing table.
IGMP Implementation Information
• Dell Networking Operating System (OS) supports IGMP versions 1, 2, and 3 based on RFCs 1112, 2236,
and 3376, respectively.
• Dell Networking OS does not support IGMP version 3 and versions 1 or 2 on the same subnet.
• IGMP on Dell Networking OS supports an unlimited number of groups.
• Dell Networking systems cannot serve as an IGMP host or an IGMP version 1 IGMP Querier.
• Dell Networking OS automatically enables IGMP on interfaces on which you enable a multicast routing
protocol.
Topics:
• IGMP Protocol Overview
• Configure IGMP
• Viewing IGMP Enabled Interfaces
• Selecting an IGMP Version
• Viewing IGMP Groups
• Adjusting Timers
• Preventing a Host from Joining a Group
• Enabling IGMP Immediate-Leave
• IGMP Snooping
• Fast Convergence after MSTP Topology Changes
• Egress Interface Selection (EIS) for HTTP and IGMP Applications
• Designating a Multicast Router Interface
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