Cisco Systems 3750E manual Default Igmp Filtering and Throttling Configuration, 24-25

Chapter 24 Configuring IGMP Snooping and MVR

Configuring IGMP Filtering and Throttling

IGMP filtering is applicable only to the dynamic learning of IP multicast group addresses, not static configuration.

With the IGMP throttling feature, you can set the maximum number of IGMP groups that a Layer 2 interface can join. If the maximum number of IGMP groups is set, the IGMP snooping forwarding table contains the maximum number of entries, and the interface receives an IGMP join report, you can configure an interface to drop the IGMP report or to replace the randomly selected multicast entry with the received IGMP report.

Note IGMPv3 join and leave messages are not supported on switches running IGMP filtering.

These sections contain this configuration information:

•Default IGMP Filtering and Throttling Configuration, page 24-25

•Configuring IGMP Profiles, page 24-25(optional)

•Applying IGMP Profiles, page 24-27(optional)

•Setting the Maximum Number of IGMP Groups, page 24-27(optional)

•Configuring the IGMP Throttling Action, page 24-28(optional)

Default IGMP Filtering and Throttling Configuration

Table 24-7shows the default IGMP filtering configuration.

Table 24-7	Default IGMP Filtering Configuration
Feature		Default Setting
IGMP filters		None applied
IGMP maximum number of IGMP groups		No maximum set
IGMP profiles		None defined
IGMP profile action		Deny the range addresses

When the maximum number of groups is in forwarding table, the default IGMP throttling action is to deny the IGMP report. For configuration guidelines, see the “Configuring the IGMP Throttling Action” section on page 24-28.

Configuring IGMP Profiles

To configure an IGMP profile, use the ip igmp profile global configuration command with a profile number to create an IGMP profile and to enter IGMP profile configuration mode. From this mode, you can specify the parameters of the IGMP profile to be used for filtering IGMP join requests from a port. When you are in IGMP profile configuration mode, you can create the profile by using these commands:

•deny: Specifies that matching addresses are denied; this is the default.

•exit: Exits from igmp-profile configuration mode.

•no: Negates a command or returns to its defaults.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		24-25