If igmp keyword is used only IGMPlearned information is shown

When verifying IGMP snooping on a switch, use the show multicast group command to display the multicast group configuration.

Use the show multicast router command to display the information about ports that have IGMP multicast routers connected to them. Use the igmp keyword to specify that only the configuration information learned through IGMP is to be displayed.

7-62 Building Scalable Cisco Internetworks (BSCI) v3.0 © 2006 Cisco Systems, Inc.

Multicast Router

Multicast Group 224.0.1.40

Multicast Router

Multicast Group 224.0.1.40

IGMP Snooping Enabled in a Switch

IGMP Snooping Enabled in a Switch

Multicast Receiver

Multicast Group 224.1.2.3

Multicast Receiver

Multicast Group 224.1.2.3

The example shows an IGMP-enabled multicast router with the IP address 10.0.0.1 and a multicast receiver with the IP address 10.0.0.2 connected to a router via a switch that has IGMP snooping enabled over ports 4/1 and 4/2, respectively. Both ports are in VLAN 10.

■ The IGMP router with the MAC address 00-10-11-7e-74-8d is a member of multicast group 224.0.1.40.

■ A multicast receiver with the MAC address 00-90-5f-69-a0-21 is receiving multicast traffic from multicast group 224.1.2.3.

© 2006 Cisco Systems, Inc.

Implementing Multicast 7-63

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