H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500 Series Ethernet Switches Chapter 3
IGMP Snooping Configuration
3-2
Multicast packet transmission
without IGMP Snooping
Source
Multicast router
Host A
Receiver
Host B
Host C
Receiver
Multicast packets
Layer 2 switch
Multicast pack
when IGMP
Source
et transmission
Snooping runs
Multicast router
Host A
Receiver
Ho
st B
Host C
Receiver
Layer 2 switch
Figure 3-1 Multicast packet transmission with or without IGMP Snooping being
enabled
3.1.2 IGMP Snooping Implementation
I. IGMP
s:
z witch port connected to a multicast group member (a
z lticast group identified by a MAC multicast address and
ely associated with IGMP snooping.
Table 3-2 IGMP Snooping timers
Snooping terminologies
Before going on, we first describe the following IGMP Snooping related term
z 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
Packet normally
Timeout action
Timer Setting
rece re ived befo
timeout
on the switch
Router port aging
timer
of the
router port
probe message
ter
port any more.
Aging time
IGMP general
query
message/PIM
message/DVMRP
Consider that this
port is not a rou
Multicast group
memb
er port aging
timer
member ports
IGMP message e to
member port.
Aging time of the
multicast group
Send an IGMP
group-specific
query messag
the multicast