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Multicast
Configuring IGMP Snooping
STEP 1
STEP 2
STEP 3
Configuring IGMP Snooping
Cisco Small Business SG200 Series 8-port Smart Switches Administration Guide
Configuring MAC Address Group Port Membership
By default, packets destined to a multicast MAC address are flooded on all ports.
Ports might become members of a particular MAC address group dynamically
through the exchange of IGMP packets, or you can statically configure them as
members.
To view details and configure the port members of a multicast group address:
Select an entry on the MAC Group Address page and click Details.
The page identifies the members of the multicast group address on every port.
Click Static to configure a port as a static member of the multicast MAC address.
Or click None to remove the port as a static member of the MAC Multicast
Address.
Click Apply and then click Close. Your changes are saved to the Running
Configuration.
Internet Group Management Protocol (IGMP) is a layer 3 Internet protocol that
enables IPv4 networks to manage memberships to multicast groups. (IPv6
multicast traffic is managed using the MLD protocol, as described in
MLD
Snooping.) IGMP communication occurs between IGMP routers and IGMP-
enabled hosts (clients). Although the switch does not initiate or reply to IGMP
packets, it can be configured to listen to IGMP communication between routers
and clients that are connected by the switch, and to make forwarding decisions
that help to reduce unnecessary network traffic.This listening behavior is referred
to as IGMP snooping. This is particularly beneficial for high-bandwidth multicast
network traffic.
Ordinarily, when the switch receives broadcast or multicast packets, the switch
forwards a copy into each of the remaining network segments. This approach
works well for broadcast packets that are intended to be processed by all
connected nodes. For multicast packets, however, this approach could lead to less
efficient use of network bandwidth, particularly when the packet is intended for
only a small number of nodes; packets are flooded into network segments where
no node has an interest in receiving the packet.
9
Configuring
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