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Multicast Forwarding
Configuring IGMP Snooping
STEP 6
STEP 7
Configuring IGMP Snooping
NOTE
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
•
IP Multicast Group Address—Enter the IP address of the new Multicast
group.
For each interface, select its association type. The options are as follows:
•
Static—Attaches the interface to the Multicast group as a static member.
•
None—Indicates that the interface is not currently a member of this Multicast
group on this VLAN.
Click Apply. The IP Multicast group is added, and the Running Configuration is
updated.
To support selective Multicast forwarding (IPv4), IGMP Snooping must be enabled
globally and for each relevant VLAN.
By default, the switch forwards Multicast frames to all ports of the relevant VLAN,
essentially treating the frame as if it is a Broadcast. With IGMP Snooping the
switch forwards Multicast frames to the ports that have registered Multicast
clients.
The switch supports IGMP Snooping only on static VLANs. It does not support
IGMP Snooping on dynamic VLANs.
When IGMP Snooping is enabled globally or on a VLAN, all IGMP packets are
forwarded to the CPU. The CPU analyzes the incoming packets, and determines
the following:
•
Which ports are asking to join which Multicast groups on what VLAN.
•
Which ports are connected to Multicast routers (Mrouters) that are
generating IGMP queries.
•
Which ports are receiving PIM, DVMRP, or IGMP query protocols.
Ports asking to join a specific Multicast group issue an IGMP report that specifies
which group(s) the host wants to join. This results in the creation of a forwarding
entry in the Multicast forwarding database.
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