Igmp snooping and switch stacks, Configuring igmp snooping, Default igmp snooping configuration – Dell POWEREDGE M1000E User Manual

Page 589

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24-7

Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide

OL-13270-03

Chapter 24 Configuring IGMP Snooping and MVR

Configuring IGMP Snooping

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

Chapter 6, “Managing Switch Stacks,”

for more information

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:

•

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 24-10

•

Enabling IGMP Immediate Leave, page 24-11