Alcatel OmniSwitch 6800 Series Network Configuration Manual page 466

IPMS Overview
In IGMPv2, each membership report contains only one multicast group. In IGMPv3, membership reports
contain many multicast groups up to the Maximum Transmission Unit (MTU) size of the interface.
IGMPv3 uses source filtering and reports multicast memberships to neighboring routers by sending
membership reports. IGMPv3 also supports Source Specific Multicast (SSM) by allowing hosts to report
interest in receiving packets only from specific source addresses or from all but specific source addresses.
Note. It should be noted that In the current release SSM packet forwarding is not done between ports in
the same VLAN. However, SSM forwarding between different VLANs (routing) is supported. In addi-
tion, the current implementation of IGMPv3 and SSM only forwards packets to a list of included sources
for a given multicast destination. Exclude list forwarding is not supported as it is not a requirement for
SSM, and specifically Protocol Independent Multicast–Source Specific Multicast (PIM-SSM). See the
OmniSwitch 6800 Series Advanced Routing Configuration Guide for more information on SSM.
page 23-6 OmniSwitch 6800 Series Network Configuration Guide
Configuring IP Multicast Switching
November 2004