Chapter 29 IGMP
Figure 129 IGMP Version 2 Example
1 Query
2 Report |
| 3 Leave |
IGMP version 3 allows a multicast host to join a multicast group and specify from which source (multicast server) it wants to receive multicast packets. Alternatively, a multicast host can specify from which multicast servers it does not want to receive multicast packets. In the following figure multicast server X (IP address 10.1.1.1) and multicast server Z (IP address 13.2.2.2) both send multicast traffic to the same multicast group identified by the multicast IP address 225.1.1.1. In IGMP version 3 multicast host A can join multicast group 225.1.1.1 and specify that it only wants to receive multicast packets from server X.
Figure 130 IGMP Version 3 Example
XZ
Group: 225.1.1.1
Server: 10.1.1.1Group: 225.1.1.1
Server: 13.2.2.2
Join: 225.1.1.1
Include: 10.1.1.1
A
29.2 Port-based IGMP
The Switch sends IGMP Query packets to all ports. The Switch then listens for IGMP Report packets, and it records which port the messages came from. It then delivers multicast traffic to only those ports from which it received a request to join a multicast group.
29.3 Configuring IGMP
Click IP Application > IGMP in the navigation panel to display the screen as shown next. Each entry in the table is automatically created when you configure a new IP domain in the IP Setup screen (refer to Section 7.6 on page 81).
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