30-14
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 30 Configuring IGMP Snooping for IPv4 Multicast Traffic
Configuring IGMP Snooping
Displaying IGMP Snooping Information
These sections describe displaying IGMP snooping information:
• Displaying Multicast Router Interfaces, page 30-14
• Displaying MAC Address Multicast Entries, page 30-14
• Displaying IGMP Snooping Information for a VLAN Interface, page 30-15
• Displaying IGMP Snooping Statistics, page 30-15
Displaying Multicast Router Interfaces
When you enable IGMP snooping, the router automatically learns to which interface the multicast
routers are connected.
To display multicast router interfaces, perform this task:
This example shows how to display the multicast router interfaces in VLAN 1:
Router# show ip igmp snooping mrouter vlan 1
vlan ports
-----+----------------------------------------
1 Gi1/1,Gi2/1,Fa3/48,Router
Router#
Displaying MAC Address Multicast Entries
To display MAC address multicast entries for a VLAN, perform this task:
This example shows how to display MAC address multicast entries for VLAN 1:
Router# show mac-address-table multicast vlan 1
vlan mac address type qos ports
-----+---------------+--------+---+--------------------------------
1 0100.5e02.0203 static -- Gi1/1,Gi2/1,Fa3/48,Router
1 0100.5e00.0127 static -- Gi1/1,Gi2/1,Fa3/48,Router
1 0100.5e00.0128 static -- Gi1/1,Gi2/1,Fa3/48,Router
1 0100.5e00.0001 static -- Gi1/1,Gi2/1,Fa3/48,Router,Switch
Router#
This example shows how to display a total count of MAC address entries for a VLAN:
Router# show mac-address-table multicast 1 count
Multicast MAC Entries for vlan 1: 4
Router#
Command Purpose
Router# show ip igmp snooping mrouter
vlan_ID
Displays multicast router interfaces.
Command Purpose
Router# show mac-address-table multicast
vlan_ID
[count]
Displays MAC address multicast entries
for a VLAN.
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