H3C Technologies H3C S3100 Series Switches - Manual (Page 239)

Operation Manual – Multicast
H3C S3100-52P Ethernet Switch Chapter 2 IGMP Snooping Configuration
2-2
Internet
Video stream
VOD Ser ver
Layer 2 Ether net switch
Multicast router
Video stream
Multicast
group member
Non-multicast
group member
Non-multicast
group member
Video stream
Internet
Video st
Layer 2 Ether net switch
router
Video
ream
VOD Ser ver
Multicast
group member
Non-multicast
group member
Non
gro
-multicast
up member
Video stream
Multicast packet transmission
Internet
Video stream
VOD Ser ver
Video stream
Multicast
group member
Non-
group member
Non-
group member
Video stream
Internet
Video st
Multicast
ream
VOD Ser ver
Multicast
group member
Non-
group member
Non
gro
-
up member
Video stream
Multicast packet transmission
without IGMP Snooping when IGMP Snoopi
stream
Video
stream
ng runs
Internet
Video stream
VOD Ser ver
Layer 2 Ether net switch
Multicast router
Video stream
Multicast
group member
Non-multicast
group member
Non-multicast
group member
Video stream
Internet
Video st
Layer 2 Ether net switch
router
Video
ream
VOD Ser ver
Multicast
group member
Non-multicast
group member
Non
gro
-multicast
up member
Video stream
Multicast packet transmission
Internet
Video stream
VOD Ser ver
Video stream
Multicast
group member
Non-
group member
Non-
group member
Video stream
Internet
Video st
Multicast
ream
VOD Ser ver
Multicast
group member
Non-
group member
Non
gro
-
up member
Video stream
Multicast packet transmission
without IGMP Snooping when IGMP Snoopi
stream
Video
stream
ng runs
d
Figure 2-1
Multicast packet transmission with or without IGMP Snooping enable
2.1.2 IGMP Snooping Implementation
I. IGMP Snooping terminologies
Before going on, we first describe the following terms involved in IGMP Snooping:
z
Router port: the switch port directly connected to the multicast router.
z
Multicast member port: a switch port connected to a multicast group member (a
host in a multicast group).
z
MAC multicast group: a multicast group identified by a MAC multicast address and
maintained by the switch.
The following three timers are closely associated with IGMP snooping.
Table 2-2
IGMP Snooping timers
Timer Setting
Packet normally
received before
timeout
Timeout action
on the switch
Router port aging
timer
Aging time of the
router port
IGMP general
query message
Consider that this
port is not a router
port any more.
Multicast member
port aging timer
Aging time of the
multicast member
ports
IGMP
message/PIM
message/Dvmrp
Probe message
Send an IGMP
group-specific
query message to
the multicast
member port.