•
IGMP filtering and throttling is not supported under the WLAN.
•
You cannot have a device stack containing a mix of Catalyst 3850 and Catalyst 3650 devices.
Related Topics
Changing the IGMP Version(CLI), on page 49
IGMP Versions, on page 34
Restrictions for IGMP Snooping
The following are the restrictions for IGMP snooping:
•
The device supports IGMPv3 snooping based only on the destination multicast IP address. It does not
support snooping based on a source IP address or proxy report.
•
IGMPv3 join and leave messages are not supported on devices 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 device.
The actual leave latency in the network is usually the configured leave time. However, the leave time
might vary around the configured time, depending on real-time CPU load conditions, network delays
and the amount of traffic sent through the interface.
•
The IGMP throttling action restriction can be applied only to Layer 2 ports. You can use ip igmp
max-groups action replace interface configuration command on a logical EtherChannel interface but
cannot use it on ports that belong to an EtherChannel port group.
When the maximum group limitation is set to the default (no maximum), entering the ip igmp max-groups
action {deny | replace} command has no effect.
If you configure the throttling action and set the maximum group limitation after an interface has added
multicast entries to the forwarding table, the forwarding-table entries are either aged out or removed,
depending on the throttling action.
Related Topics
Changing the IGMP Version(CLI), on page 49
IGMP Versions, on page 34
Information About IGMP
Role of the Internet Group Management Protocol
IGMP is used to dynamically register individual hosts in a multicast group on a particular LAN. Enabling
PIM on an interface also enables IGMP. IGMP provides a means to automatically control and limit the flow
of multicast traffic throughout your network with the use of special multicast queriers and hosts.
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 33
Configuring IGMP
Restrictions for IGMP Snooping
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