3Com SuperStack 4 Configuration Manual page 159

Figure 39 Multicast packet transmission without IGMP Snooping
Multicast router
Layer 2 Ethernet Switch
Switch 5500
Video stream
Multicast group member Non-multicast
group member
When IGMP Snooping operates, packets are not forwarded to all ports, see
Figure 40.
Figure 40 Multicast packet transmission when IGMP Snooping runs
Multicast router
Layer 2 Ethernet Switch
Switch 5500
Video stream
Multicast group member Non-multicast
group member
IGMP Snooping Terminology
Table 176 explains switching terminology relevant to IGMP Snooping.
Table 176 Switching Terminology relevant to IGMP Snooping
Term
Router Port
Multicast member port
MAC multicast group
Internet / Intranet
Video stream
Video stream
Video stream
Non-multicast
group member
Internet / Intranet
Video stream
Video stream
Video stream
Non-multicast
group member
Meaning
The port of the switch, directly connected to the multicast
router.
The port connected to the multicast member. The multicast
member refers to a host that joined a multicast group.
The multicast group is identified with MAC multicast address
and maintained by the Switch 5500G-EI.
IGMP Snooping 171
Video stream
VOD Server
Video stream
VOD Server