Igmp Versions; Igmp Version 1; Default Igmp Configuration - Cisco Catalyst 2960-XR Configuration Manuals

Understanding Cisco's Implementation of IP Multicast Routing

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
Feature
Multilayer switch as a member of a multicast group
Access to multicast groups
IGMP version
IGMP host-query message interval
IGMP query timeout
IGMP maximum query response time
Multilayer switch as a statically connected member
OL-29426-01
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
Default Setting
No group memberships are defined.
All groups are allowed on an interface.
Version 2 on all interfaces.
60 seconds on all interfaces.
60 seconds on all interfaces.
10 seconds on all interfaces.
Disabled.
IGMP Versions
15