Multicast
Configuring IGMP Snooping
258 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
16
•Source Specific—Indicates that the entry contains a specific source, and
adds the address in the IP Source Address field. If not, the entry is added as
a (*,G) entry, an IP group address from any IP source.
•Source IP Address—Defines the source address to be included.
STEP 7 Click Apply. The IP Multicast group is added, and the device is updated.
STEP 8 To configure and display the registration of an IP group address, select an address
and click Details.
The VLAN ID, IP Version, IP Multicast Group Address, and Source IP Address
selected are displayed as read-only in the top of the window. You can select the
filter type:
•Interface Type equals to—Select whether to display ports or LAGs.
STEP 9 For each interface, select its association type. The options are as follows:
•Static—Attaches the interface to the Multicast group as a static member.
•Forbidden —Specifies that this port is forbidden from joining this group on
this VLAN.
•None—Indicates that the port is not currently a member of this Multicast
group on this VLAN. This is selected by default until Static or Forbidden is
selected.
STEP 10 Click Apply. The Running Configuration file is updated.
Configuring IGMP Snooping
To support selective Multicast forwarding (IPv4), Bridge Multicast filtering must be
enabled (in the Properties page), and IGMP Snooping must be enabled globally
and for each relevant VLAN (in the IGMP Snooping page).
By default, a Layer 2 device forwards Multicast frames to all ports of the relevant
VLAN, essentially treating the frame as if it were a Broadcast. With IGMP Snooping
the device forwards Multicast frames to ports that have registered Multicast
clients.
NOTE The device supports IGMP Snooping only on static VLANs. It does not support
IGMP Snooping on dynamic VLANs.