Igmp Snooping Implementation - H3C S7500 Series Operation Manual

Operation Manual – Multicast
H3C S7500 Series Ethernet Switches
Multicast packet transmission
Source
Host A
Receiver
Multicast packets
Figure 3-1 Multicast packet transmission with or without IGMP Snooping being
enabled

3.1.2 IGMP Snooping Implementation

I. IGMP Snooping terminologies
Before going on, we first describe the following IGMP Snooping related term
Router port: the switch port directly connected to the multicast router.
Multicast member port: a s
host in a multicast group).
MAC multicast group: a mu
maintained by the switch.
The following three timers are clos
Table 3-2 IGMP Snooping timers
Timer
Router port aging
timer
Multicast group
member port aging
timer
without IGMP Snooping
Multicast router
Layer 2 switch
Host C
Receiver
Host B
Setting
Aging time
router port
Aging time of the
multicast group
member ports
Chapter 3 IGMP Snooping Configuration
Multicast pack et transmission
when IGMP Snooping runs
Source
Host A
Receiver
Host B
witch port connected to a multicast group member (a
lticast group identified by a MAC multicast address and
ely associated with IGMP snooping.
Packet normally
rece ived befo
timeout
IGMP general
query
of the
message/PIM
message/DVMRP
probe message
IGMP message
3-2
Multicast router
Layer 2 switch
Host C
Receiver
s:
Timeout action
re
on the switch
Consider that this
port is not a rou
port any more.
Send an IGMP
group-specific
query messag
the multicast
member port.
ter
e to