PurposeCommand or Action
(Optional) Displays multicast-related information about an
interface.
show ip igmp interface
Example:
Device# show ip igmp interface
Step 7
Related Topics
Router-Port Group Management Protocol (RGMP), on page 113
RGMP Configuration Example, on page 117
Configuration Examples for Constraining IP Multicast in a
Switched Ethernet Network
Example: CGMP Configuration
The following example is for a basic network environment where multicast source(s) and multicast receivers
are in the same VLAN. The desired behavior is that the switch will constrain the multicast forwarding to those
ports that request the multicast stream.
A 4908G-L3 router is connected to the Catalyst 4003 on port 3/1 in VLAN 50. The following configuration
is applied on the GigabitEthernet1 interface. Note that there is no ip multicast-routing command configured
because the router is not routing multicast traffic across its interfaces.
interface GigabitEthernet1
ip address 192.168.50.11 255.255.255.0
ip pim dense-mode
ip cgmp
Related Topics
Enabling CGMP, on page 114
CGMP on Catalyst Switches for IP Multicast, on page 112
RGMP Configuration Example
The following example shows how to configure RGMP on a router:
ip multicast-routing
ip pim sparse-mode
interface ethernet 0
ip rgmp
Related Topics
Configuring IP Multicast in a Layer 2 Switched Ethernet Network, on page 115
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 117
Constraining IP Multicast in Switched Ethernet
Configuration Examples for Constraining IP Multicast in a Switched Ethernet Network
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