Igmp Snooping And Switch Stacks; Configuring Igmp Snooping; Default Igmp Snooping Configuration - Cisco WS-CBS3032-DEL Software Configuration Manual

Chapter 24 Configuring IGMP Snooping and MVR

IGMP Snooping and Switch Stacks

IGMP snooping functions across the switch stack; that is, IGMP control information from one switch is
distributed to all switches in the stack. (See
about switch stacks.) Regardless of the stack member through which IGMP multicast data enters the
stack, the data reaches the hosts that have registered for that group.
If a switch in the stack fails or is removed from the stack, only the members of the multicast group that
are on that switch will not receive the multicast data. All other members of a multicast group on other
switches in the stack continue to receive multicast data streams. However, multicast groups that are
common for both Layer 2 and Layer 3 (IP multicast routing) might take longer to converge if the stack
master is removed.

Configuring IGMP Snooping

IGMP snooping allows switches to examine IGMP packets and make forwarding decisions based on their
content. These sections contain this configuration information:
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Default IGMP Snooping Configuration

Table 24-3
Table 24-3
Feature
IGMP snooping
Multicast routers
Multicast router learning (snooping) method
IGMP snooping Immediate Leave
Static groups
TCN
TCN query solicitation
OL-13270-06
Default IGMP Snooping Configuration, page 24-7
Enabling or Disabling IGMP Snooping, page 24-8
Setting the Snooping Method, page 24-9
Configuring a Multicast Router Port, page 24-10
Configuring a Blade Server Statically to Join a Group, page 24-11
Enabling IGMP Immediate Leave, page 24-11
Configuring the IGMP Leave Timer, page 24-12
Configuring TCN-Related Commands, page 24-13
Configuring the IGMP Snooping Querier, page 24-15
Disabling IGMP Report Suppression, page 24-16
shows the default IGMP snooping configuration.
Default IGMP Snooping Configuration
1
flood query count
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
Chapter 7, "Managing Switch Stacks,"
Default Setting
Enabled globally and per VLAN
None configured
PIM-DVMRP
Disabled
None configured
2
Disabled
Configuring IGMP Snooping
for more information
24-7