H3C S3600 Series User Manual

Operation Manual – Multicast
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1 Multicast Overview
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Figure 1-5 Mapping relationship between multicast IP address and multicast MAC
address
The high-order four bits of the IP multicast address are 1110, representing the multicast
ID. Only 23 bits of the remaining 28 bits are mapped to a MAC address. Thus, five bits
of the multicast IP address are lost. As a result, 32 IP multicast addresses are mapped
to the same MAC address.
1.2.2 IP Multicast Protocols
IP multicast protocols include the multicast group management protocol and the
multicast routing protocol.
Figure 1-6 describes the positions of the protocols related to
multicast in the network.
Server
Multicast
User D
User E
User C
IGMP
IGMP
User A
User B
IGMP
MBG P/ MS DP
PIM
PIM
AS1
AS2
Server
Multicast
User D
User E
User C
IGMP
IGMP
User A
User B
IGMP
Server
Multicast
User D
User E
User C
IGMP
IGMP
User A
User B
IGMP
MBG P/ MS DP
PIM
PIM
AS1
AS2
Figure 1-6 Positions of protocols related to multicast
I. Multicast group management protocol
Internet group membership protocol (IGMP) is adopted between hosts and multicast
routers. This protocol defines the mechanism of establishing and maintaining group
membership between hosts and multicast routers.

H3C S3600 Series Specifications

General

Brand	H3C
Model	S3600 Series
Category	Switch
Language	English