Internet Group Management Protocol (Igmp); Igmp Implementation Information; Igmp Protocol Overview; Igmp Version 2 - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Internet Group Management Protocol (IGMP)

Multicast is premised on identifying many hosts by a single destination IP address; hosts represented by

the same IP address are a multicast group. Internet Group Management Protocol (IGMP) is a Layer 3

multicast protocol that hosts use to join or leave a multicast group. Multicast routing protocols (such as

PIM) use the information in IGMP messages to discover which groups are active and to populate the

multicast routing table.

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 S25/S50,95

interfaces on the S4810, S55, and S60and an 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 has three versions. Version 3 obsoletes and is backwards-compatible with version 2; version 2

obsoletes version 1.

IGMP version 2 improves upon version 1 by specifying IGMP Leave messages, which allows hosts to

notify routers that they no longer care about traffic for a particular group. Leave messages reduce the

amount of time that the router takes to stop forwarding traffic for a group to a subnet (leave latency) after

the last host leaves the group. In version 1 hosts quietly leave groups, and the router waits for a query

response timer several times the value of the query interval to expire before it stops forwarding traffic.

is supported on platforms:

Internet Group Management Protocol (IGMP) | 459