System information

2-85
Multicast Filtering
2
• Multicast Group Port List – Shows the interfaces that have already been
assigned to the selected VLAN to propagate a specific multicast service.
Web – Click IGMP, IP Multicast Registration Table. Select the VLAN ID and multicast
IP address. The switch will display all the ports that are propagating this multicast
service.
Figure 2-56. IP Multicast Registration Table
CLI – This example displays all the known multicast services supported on VLAN 1,
along with the ports propagating the corresponding services. The type field shows if
this entry was learned dynamically or was statically configured.
Adding Ports to Multicast Services
Multicast filtering can be dynamically configured using IGMP Snooping and IGMP
Query messages as described in “Configuring IGMP Snooping and Query
Parameters” on page 2-81. For certain applications that require tighter control, you
may need to statically configure a multicast service on the switch. First add all the
ports attached to participating hosts to a common VLAN, and then assign the
multicast service to that VLAN group.
Command Usage
• Static multicast addresses are never aged out.
• When a multicast address is assigned to specific VLAN, the corresponding traffic
can only be forwarded to ports within that VLAN.
Console#show mac-address-table multicast vlan 1 3-105
VLAN M'cast IP addr. Member ports Type
---- --------------- ------------ -------
1 224.0.0.12 Eth1/12 USER
1 224.1.2.3 Eth1/12 IGMP
Console#