Huawei Quidway S5600 Series Operation Manual page 421

Operation Manual – Multicast Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
Timer
Query
timer
II. Layer 2 multicast with IGMP Snooping
The switch runs IGMP Snooping to listen to IGMP messages and map the host, the port
corresponding to the host, and the corresponding multicast MAC address.
IGMP-enabled router
IGMP Snooping-enabled
Ethernet switch
Figure 2-2 IGMP Snooping implementation
To implement Layer 2 multicast, the switch processes four different types of IGMP
messages it received, as shown in Table 2-3.
Table 2-3 IGMP Snooping messages
Message Sender
IGMP Multica
general st
query router
message and
multica
st
switch
Setting
response Query response
timeout time
Receiver Purpose
Multicast Query if
member the
switch multicast
and host groups
contain
any
member
Huawei Technologies Proprietary
Chapter 2 IGMP Snooping Configuration
Packet normally
received before
timeout
IGMP
message
Internet
Internet
IGMP message
IGMP message
Switch action
Check if the message
comes from the original
router port
2-3
Timeout action
on the switch
Remove the port
report from the member
port list of the
multicast group.
If yes, reset the aging
timer of the router port
If not, notify
multicast router that a
member is in
multicast group and
start the aging timer for
the router port
the
a