Configuring the Switch
3-114
Web – Click IGMP Snooping, IP Multicast Registration Table. Select a VLAN ID and
the IP address for a multicast service from the scroll-down lists. The switch will
display all the interfaces that are propagating this multicast service.
CLI – The following shows the multicast entries learned through IGMP snooping for
VLAN 1:
Assigning 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 3-110. 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 an interface in a specific VLAN, the
corresponding traffic can only be forwarded to ports within that VLAN.
Command Attribute
• Interface – Activates the Port or Trunk scroll down list.
• VLAN ID – Selects the VLAN to propagate all multicast traffic coming from the
attached multicast router/switch.
• Multicast IP – The IP address for a specific multicast service
• Port or Trunk – Specifies the interface attached to a multicast router/switch.
Console#show mac-address-table multicast vlan 1 igmp-snooping 4-161
VLAN M'cast IP addr. Member ports Type
---- --------------- ------------ -------
1 224.1.2.3 Eth1/1 IGMP
Console#
