Cisco SF 200-24P Technical Information Page 204

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Configuring Multicast Forwarding
Multicast Forwarding
Cisco Small Business 200 1.1 Series Smart Switch Administration Guide 195
15
Multicast Operation
Multicast Operation
In a Layer 2 Multicast service, a Layer 2 switch receives a single frame addressed
to a specific Multicast address. It creates copies of the frame to be transmitted on
each relevant port.
When the switch is IGMP/MLD-snooping-enabled and receives a frame for a
Multicast stream, it forwards the Multicast frame to all the ports that have
registered to receive the Multicast stream using IGMP Join messages.
The switch can forward Multicast streams based on one of the following options:
Multicast MAC Group Address
IP Multicast Group Address (G)
A combination of the source IP address (S) and the destination IP Multicast
Group Address (G) of the Multicast packet.
One of these options can be configured per VLAN.
The system maintains lists of Multicast groups for each VLAN, and this manages
the Multicast information that each port should receive. The Multicast groups and
their receiving ports can be configured statically or learned dynamically using
IGMP or Multicast Listener Discovery (MLD) protocols snooping.
Multicast Registration
Multicast Registration
Multicast registration is the process of listening and responding to Multicast
registration protocols. The available protocols are IGMP for IPv4 and MLD for IPv6.
When IGMP/MLD snooping is enabled in a switch on a VLAN, it analyzes the IGMP/
MLD packets it receives from the VLAN connected to the switch and Multicast
routers in the network.
When a switch learns that a host is using IGMP/MLD messages to register to
receive a Multicast stream, optionally from a specific source, the switch adds the
registration to its Multicast Forwarding Data Base (MFDB).
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