Default Igmp Filtering And Throttling Configuration - Cisco Catalyst 3550 series Software Configuration Manual

Configuring IGMP Filtering and Throttling
With the IGMP throttling feature, you can also 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 remove a randomly selected multicast entry in the
forwarding table and then to add the IGMP group in the report to the table.
These sections describe how to configure IGMP filtering and throttling:
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Default IGMP Filtering and Throttling Configuration

Table 20-7
Table 20-7 Default IGMP Filtering Configuration
Feature
IGMP filters
IGMP Maximum number of IGMP groups
IGMP profiles
IGMP profile action
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
section on page 20-25.
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:
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The default is for the switch to have no IGMP profiles configured. When a profile is configured, if
neither the permit nor deny keyword is included, the default is to deny access to the range of IP
addresses.
Catalyst 3550 Multilayer Switch Software Configuration Guide
20-22
Default IGMP Filtering and Throttling Configuration, page 20-22
Configuring IGMP Profiles, page 20-22
Applying IGMP Profiles, page 20-23
Setting the Maximum Number of IGMP Groups, page 20-24
Configuring the IGMP Throttling Action, page 20-25
shows the default IGMP filtering configuration.
deny: Specifies that matching addresses are denied; this is the default condition.
exit: Exits from igmp-profile configuration mode.
no: Negates a command or sets its defaults.
permit: Specifies that matching addresses are permitted.
range: Specifies a range of IP addresses for the profile. You can enter a single IP address or a range
with a start and an end address.
Chapter 20
(optional)
(optional)
(optional)
(optional)
Default Setting
None applied
No maximum set
None defined
Deny the range addresses
"Configuring the IGMP Throttling Action"
Configuring IGMP Snooping and MVR
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