Huawei Quidway S3500 Series Operation Manual page 282

Operation Manual - Multicast
Quidway S3500 Series Ethernet Switches
Multicast member port: The port connected to the multicast member. The
multicast member refers to a host joined a multicast group.
MAC multicast group: The multicast group is identified with MAC multicast
address and maintained by the Ethernet switch.
Router port aging time: Time set on the router port aging timer. If the switch has
not received any IGMP general query message before the timer times out, it
considers the port no longer as a router port.
Multicast group member port aging time: When a port joins an IP multicast group,
the aging timer of the port will begin timing. The multicast group member port
aging time is set on this aging timer. If the switch has not received any IGMP
report message before the timer times out, it transmits IGMP specific query
message to the port.
Maximum response time: When the switch transmits IGMP specific query
message to the multicast member port, the Ethernet switch starts a response timer,
which times before the response to the query. If the switch has not received any
IGMP report message before the timer times out, it will remove the port from the
multicast member ports
II. Implement Layer 2 multicast with IGMP Snooping
The Ethernet switch runs IGMP Snooping to listen to the IGMP messages and map the
host and its ports to the corresponding multicast group address. To implement IGMP
Snooping, the Layer 2 Ethernet switch processes different IGMP messages in the way
illustrated in the figure below:
A router
running IGMP
A Ethernet Switch
running IGMP Snooping
Figure 3-3 Implement IGMP Snooping
1) IGMP general query message: Transmitted by the multicast router to the multicast
group members to query which multicast group contains member. When an IGMP
Internet
Huawei Technologies Proprietary
3-3
Chapter 3 IGMP Snooping Configuration
IGMP packets
IGMP packets