Filter
Top Products
Internet Group Management Protocol | 403
19
Internet Group Management Protocol
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.
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, and
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 Protocol Overview
IGMP has three versions. Version 3 obsoletes and is backwards-compatible with version 2; version 2
obsoletes version 1.
Table 19-1. FTOS Support for IGMP and IGMP Snooping
Feature Platform
IGMP version 1, 2, and 3 c e s
IGMP Snooping version 1, 2, and 3 c e s
Note: When both E-Series TeraScale and ExaScale are supported, only the e symbol is shown. If a
feature is supported by one or the other chassis, the specific symbols are shown: e
t
for E-Series
TeraScale or e
x
for E-Series ExaScale.