Default Igmp Snooping Configuration - Cisco Catalyst 2360 Software Configuration Manual

Configuring IGMP Snooping
The switch uses IGMP report suppression to forward only one IGMP report per multicast router query
to multicast devices. When IGMP router suppression is enabled (the default), the switch sends the first
IGMP report from all hosts for a group to all the multicast routers. The switch does not send the
remaining IGMP reports for the group to the multicast routers. This feature prevents duplicate reports
from being sent to the multicast devices.
If the multicast router query includes requests only for IGMPv1 and IGMPv2 reports, the switch
forwards only the first IGMPv1 or IGMPv2 report from all hosts for a group to all the multicast routers.
If the multicast router query also includes requests for IGMPv3 reports, the switch forwards all IGMPv1,
IGMPv2, and IGMPv3 reports for a group to the multicast devices.
If you disable IGMP report suppression, all IGMP reports are forwarded to the multicast routers. For
configuration steps, see the
Configuring IGMP Snooping
IGMP snooping allows switches to examine IGMP packets and make forwarding decisions based on their
content. These sections contain this configuration information:
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Default IGMP Snooping Configuration

Table 15-3
Table 15-3
Feature
IGMP snooping
Multicast routers
Multicast router learning (snooping) method
IGMP snooping Immediate Leave
Static groups
TCN
TCN query solicitation
Catalyst 2360 Switch Software Configuration Guide
15-6
"Disabling IGMP Report Suppression" section on page
Default IGMP Snooping Configuration, page 15-6
Enabling or Disabling IGMP Snooping, page 15-7
Setting the Snooping Method, page 15-8
Configuring a Multicast Router Port, page 15-9
Configuring a Host Statically to Join a Group, page 15-9
Enabling IGMP Immediate Leave, page 15-10
Configuring the IGMP Leave Timer, page 15-10
Configuring TCN-Related Commands, page 15-11
Configuring the IGMP Snooping Querier, page 15-13
Disabling IGMP Report Suppression, page 15-15
shows the default IGMP snooping configuration.
Default IGMP Snooping Configuration
1
flood query count
Chapter 15 Configuring IGMP Snooping
Default Setting
Enabled globally and per VLAN
None configured
PIM-DVMRP
Disabled
None configured
2
Disabled
15-15.
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