IGMP Versions
The switch supports IGMP version 1, IGMP version 2, and IGMP version 3. These versions are interoperable
on the switch. For example, if IGMP snooping is enabled and the querier's version is IGMPv2. and the switch
receives an IGMPv3 report from a host, then the switch can forward the IGMPv3 report to the multicast router.
IGMP Version 1
IGMP version 1 (IGMPv1) primarily uses a query-response model that enables the multicast router and
multilayer switch to find which multicast groups are active (have one or more hosts interested in a multicast
group) on the local subnet. IGMPv1 has other processes that enable a host to join and leave a multicast group.
For more information, see RFC 1112.
IGMP Version 2
IGMPv2 extends IGMP functionality by providing such features as the IGMP leave process to reduce leave
latency, group-specific queries, and an explicit maximum query response time. IGMPv2 also adds the capability
for routers to elect the IGMP querier without depending on the multicast protocol to perform this task. For
more information, see RFC 2236.
IGMP version 2 is the default version for the switch.Note
Default IGMP Configuration
This table displays the default IGMP configuration for the switch.
Table 4: Default IGMP Configuration
Default SettingFeature
No group memberships are defined.Multilayer switch as a member of a multicast group
All groups are allowed on an interface.Access to multicast groups
Version 2 on all interfaces.IGMP version
60 seconds on all interfaces.IGMP host-query message interval
60 seconds on all interfaces.IGMP query timeout
10 seconds on all interfaces.IGMP maximum query response time
Disabled.Multilayer switch as a statically connected member
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29426-01 15
Understanding Cisco's Implementation of IP Multicast Routing
IGMP Versions
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