Internet Group Management Protocol | 40319Internet Group Management ProtocolMulticast is premised on identifying many hosts by a single destination IP address; hosts represented bythe same IP address are a multicast group. Internet Group Management Protocol (IGMP) is a Layer 3multicast protocol that hosts use to join or leave a multicast group. Multicast routing protocols (such asPIM) use the information in IGMP messages to discover which groups are active and to populate themulticast routing table.IGMP Implementation Information• FTOS supports IGMP versions 1, 2, and 3 based on RFCs 1112, 2236, and 3376, respectively.• FTOS does not support IGMP version 3 and versions 1 or 2 on the same subnet.• IGMP on FTOS supports up to 512 interfaces on E-Series, 31 interfaces on C-Series and S-Series, andan unlimited number of groups on all platforms.• Dell Force10 systems cannot serve as an IGMP host or an IGMP version 1 IGMP Querier.• FTOS automatically enables IGMP on interfaces on which you enable a multicast routing protocol.IGMP Protocol OverviewIGMP has three versions. Version 3 obsoletes and is backwards-compatible with version 2; version 2obsoletes version 1.Table 19-1. FTOS Support for IGMP and IGMP SnoopingFeature PlatformIGMP version 1, 2, and 3 c e sIGMP Snooping version 1, 2, and 3 c e sNote: When both E-Series TeraScale and ExaScale are supported, only the e symbol is shown. If afeature is supported by one or the other chassis, the specific symbols are shown: e t for E-SeriesTeraScale or ex for E-Series ExaScale.
