АМАТЕК AN-SGM28P24-400 [195/322] Query query

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（） IGMP

SWITCH

QUERY

QUERY QUERY

REPORT

1/1 1/2

1/3

REPORT

If all the devices in the picture are in a subnet, suppose that the subnet VLAN is 2. Router

runs IGMPv2 protocol and sends IGMP QUERY packets regularly. Host 1 wants to join multicast

group 224.1.1.1. After receiving the IGMP QUERY packet from the 1/3 port, the switch will

record the port and forward the packet to port 1/1 and 1/2. Host 1 sends a IGMP REPORT packet

after receiving the IGMP QUERY packet, and host 2 does not send IGMP REPORT packets

because it does not want to join the multicast group. After receiving the IGMP REPORT packet

from the port 1/1, the switch forwards the packet from the query port 1/3 and creates a two layer

multicast item (assuming that the item does not exist). The two layer multicast entry includes the

following items：

Two layer multicast

address

VLAN ID Output port list

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

1/1

，

1/3