АМАТЕК AN-SGM28P24-400 [196/322] Leave a group

195 / 322

（） IGMP

SWITCH

QUERY

QUERY QUERY

REPORT

1/1

1/2

1/3

REPORT

As shown in Figure 1, host 1 has added multicast group 224.1.1.1, and now host 2 wants to

join multicast group 224.1.1.1. When the host 2 received IGMP QUERY packet after sending

back a IGMP REPORT packet switch IGMP REPORT received from the 1/2 port will put the

package from the 1/3 query port forwarded and make port 1/2 was added to the two layer multicast

entry, the entry into the two layer multicast：

13.1.4 Leave a group

In order to be able to form a stable multicast environment, IGMP devices (such as routers)

send a IGMP QUERY packet to all hosts at regular intervals. The host that has joined the

multicast group or who wants to join the multicast group returns a IGMP REPORT after receiving

the IGMP QUERY。

If the host wants to leave a multicast group, there are two ways: the active leave and the

passive leave. The active departure is the host sends a IGMP LEAVE packet to the router, and the

passive departure is when the host receives the IGMP QUERY sent by the router and does not

Two layer multicast

address

VLAN ID Output port list

01:00:5e:01:01:01

1/1

，

1/2

，

1/3