Joining A Multicast Group - Cisco Catalyst 2360 Software Configuration Manual
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Also See for Catalyst 2360:
- Hardware installation manual (74 pages) ,
- Getting started manual (21 pages)
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Chapter 15
Configuring IGMP Snooping
Understanding IGMP Snooping
IGMPv3 join and leave messages are not supported on switches running IGMP filtering or MVR.
Note
An IGMPv3 switch can receive messages from and forward messages to a device running the Source
Specific Multicast (SSM) feature. For more information about source-specific multicast with IGMPv3
and IGMP, see this URL:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a008008048a.
html
Joining a Multicast Group
When a host connected to the switch wants to join an IP multicast group and it is an IGMP Version 2
client, it sends an unsolicited IGMP join message, specifying the IP multicast group to join.
Alternatively, when the switch receives a general query from the router, it forwards the query to all ports
in the VLAN. IGMP Version 1 or Version 2 hosts wanting to join the multicast group respond by sending
a join message to the switch. The switch CPU creates a multicast forwarding-table entry for the group if
it is not already present. The CPU also adds the interface where the join message was received to the
forwarding-table entry. The host associated with that interface receives multicast traffic for that
multicast group. See
Figure
15-1.
Figure 15-1
Initial IGMP Join Message
Router A
1
IGMP report 224.1.2.3
VLAN
PFC
CPU
0
Forwarding
table
2
3
4
5
Host 1
Host 2
Host 3
Host 4
Catalyst 2360 Switch Software Configuration Guide
15-3
OL-19808-01
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