Cisco Catalyst 2960 Series, Configuration Manual

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• Configure an IP address on the VLAN interface. When enabled, the IGMP snooping querier uses the IP
address as the query source address.
• If there is no IP address configured on the VLAN interface, the IGMP snooping querier tries to use the
configured global IP address for the IGMP querier. If there is no global IP address specified, the IGMP
querier tries to use the VLAN switch virtual interface (SVI) IP address (if one exists). If there is no SVI
IP address, the switch uses the first available IP address configured on the switch. The first IP address
available appears in the output of the
show ip interface
privileged EXEC command. The IGMP snooping
querier does not generate an IGMP general query if it cannot find an available IP address on the switch.
• The IGMP snooping querier supports IGMP Versions 1 and 2.
• When administratively enabled, the IGMP snooping querier moves to the nonquerier state if it detects
the presence of a multicast router in the network.
• When it is administratively enabled, the IGMP snooping querier moves to the operationally disabled
state under these conditions:
◦ IGMP snooping is disabled in the VLAN.
◦ PIM is enabled on the SVI of the corresponding VLAN.
Related Topics
Configuring the IGMP Snooping Querier , on page 142
IGMP Snooping, on page 118
Prerequisites for MVR
The following are the prerequisites for Multicast VLAN Registration (MVR):
• To use MVR, the switch must be running the LAN Base image.
Restrictions for Configuring IGMP Snooping and MVR
Restrictions for IGMP Snooping
The following are the restrictions for IGMP snooping:
• The switch supports homogeneous stacking and mixed stacking. Mixed stacking is supported only with
the Catalyst 2960-S switches. A homogenous stack can have up to eight stack members, while a mixed
stack can have up to four stack members. All switches in a switch stack must be running the LAN Base
image.
• IGMPv3 join and leave messages are not supported on switches running IGMP filtering or Multicast
VLAN registration (MVR).
• IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports.
This feature is not supported when the query includes IGMPv3 reports.
• The IGMP configurable leave time is only supported on hosts running IGMP Version 2. IGMP version
2 is the default version for the switch.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
116
Restrictions for Configuring IGMP Snooping and MVR