Connectivity Guide

IGMP is enabled on interface
IGMP version is 3
IGMP query interval is 60 seconds
IGMP querier timeout is 130 seconds
IGMP last member query response interval is 1000 ms
IGMP max response time is 10 seconds
IGMP immediate-leave is disabled on this interface
IGMP joins count: 0
IGMP querying router is 3.1.1.1
Vlan121 is up, line protocol is up
Internet address is 121.1.1.2
IGMP is enabled on interface
IGMP version is 3
IGMP query interval is 60 seconds
IGMP querier timeout is 130 seconds
IGMP last member query response interval is 1000 ms
IGMP max response time is 10 seconds
IGMP immediate-leave is disabled on this interface
IGMP joins count: 100
IGMP querying router is 121.1.1.2
To view IGMP groups:
OS10# show ip igmp groups
Total Number of Groups: 100
IGMP Connected Group Membership
Group Address Interface Mode Uptime Expires Last Reporter
225.1.1.1 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.2 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.3 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.4 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.5 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.6 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.7 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.8 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.9 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.10 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.11 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.12 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.13 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.14 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.15 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.16 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
IGMP snooping
IGMP snooping uses the information in IGMP packets to generate a forwarding table that associates ports with multicast groups. When
switches receive multicast frames, they forward them to their intended receivers. OS10 supports IGMP snooping on virtual local area
network (VLAN) interfaces.
Eective with OS10 release 10.4.3.0, IGMP snooping is enabled by default.
Congure IGMP snooping
• Enable IGMP snooping globally using the ip igmp snooping enable command in CONFIGURATION mode. This command
enables IGMP snooping on all VLAN interfaces.
• (Optional) Disable IGMP snooping on specic VLAN interfaces using the no ip igmp snooping command in VLAN INTERFACE
mode.
• (Optional) Multicast ood control is enabled by default. To disable the multicast ood restrict feature, use the no multicast
snooping flood-restrict command in CONFIGURATION mode. To reenable the feature globally, use the multicast
snooping flood-restrict
command in CONFIGURATION mode.
• In a network, the snooping switch is connected to a multicast Router that sends IGMP queries. On a Layer 2 network that does not
have a multicast router, you can congure the snooping switch to act as querier. Use the ip igmp snooping querier command
in VLAN INTERFACE mode to send the queries.
Multicast
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