Feature Configuration - Linksys LGS308 User Manual

Feature Configuration

The Feature Configuration page enables you to configure the Bridge Multicast filtering status.
By default, all Multicast frames are flooded to all ports of the VLAN. To selectively forward only
to relevant ports and filter (drop) the Multicast on the rest of the ports, enable Bridge Multicast
filtering status in the Feature Configuration page.
If filtering is enabled, Multicast frames are forwarded to a subset of the ports in the relevant
VLAN as defined in the Multicast Forwarding Data Base. Multicast filtering is enforced on all
traffic. By default, such traffic is flooded to all relevant ports, but you can limit forwarding to a
smaller subset.
A common way of representing Multicast membership is the (S, G) notation where S is the (single)
source sending a Multicast stream of data, and G is the IPv4 group address. If a Multicast client
can receive Multicast traffic from any source of a specific Multicast group, this is saved as (*, G).
Ways of forwarding Multicast frames:
• MAC Group Address—Based on the destination MAC address in the Ethernet frame.
Note—One or more IP Multicast group addresses can be mapped to a MAC group
address. Forwarding, based on the MAC group address, can result in an IP Multicast
stream being forwarded to ports that have no receiver for the stream.
• IP Group Address—Based on the destination IP address of the IP packet (*, G).
• Source Specific IP Group Address—Based on both the destination IP address and the
source IP address of the IP packet (S, G).
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