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Chapter 29 IGMP
GS-4012F/4024 User’s Guide
243
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 129 IGMP Version 3 Example
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 83).
Figure 130 IP Application > IGMP
Join: 225.1.1.1
Include: 10.1.1.1
Group: 225.1.1.1
Server: 13.2.2.2
Group: 225.1.1.1
Server: 10.1.1.1
A
X
Z