UTStarcom iSpirit 3026 Manual page 87

Figure7-2.example
The same example is shown in Figure7-2, with Host 2 also wants to join the group.
As shown Figure7-2, Host 1 has already joined the group 224.1.1.1. Now Host 2 also wants to
join the group. When Host 2 gets the QUERY packet, it will also respond with a REPORT packet;
When the switch receives the REPORT packet at port 1/2, it will transmit it out of the ingress port
3/1 of the QUERY packet, and add port 1/2 to the multicast entry, as shown in Table7-2:
Table7-2:
Layer 2 multicast ddress Vlan ID Output port list
01:00:5e:01:01:01 2 1/1, 1/2, 3/1
4. To delete a group
To set up a steady multicasting environment, devices with IGMP (such as routers) will send out
IGMP QUERY packets periodically to all hosts. Hosts that have already joined the group or hosts
that hope to join will respond with IGMP REPORT packets.
There are two methods for hosts to leave a group: leave actively or passively. Hosts leaving
actively will send IGMP LEAVE packets to routers or switches, while hosts leaving passively just
don't send IGMP REPORT packets when receiving QUERY packets from the routers or