Huawei Quidway S3900 Series User Manual

Operation Manual – Multicast Protocol
Quidway S3900 Series Ethernet Switches-Release 1510 Chapter 1 Multicast Overview
Huawei Technologies Proprietary
1-9
XXXXX
25bit MAC address prefix
XXXXXXXX XXXXXXXX XXXXXXXX1110XXXX
XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX
…… ……
32-bit IP address
48-bit MAC address
23bit
mapping
Five bits are lost
XXXXX
25bit MAC address prefix
XXXXXXXX XXXXXXXX
XXXXX
25-bit MAC address prefix
XXXXXXXX XXXXXXXX XXXXXXXX1110XXXX
XXXXXXXX
XXXXXXXX1110XXXX
XXXXXXXX XXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX
…… ……
XXXXXXXX XXXXXXXX XXXXXXXX
…… ……
23-bit
mapping
XXXXX
25bit MAC address prefix
XXXXXXXX XXXXXXXX
XXXXX
25bit MAC address prefix
XXXXXXXX XXXXXXXX XXXXXXXX1110XXXX
XXXXXXXX
XXXXXXXX1110XXXX
XXXXXXXX XXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX
…… ……
32-bit IP address
48-bit MAC address
23bit
mapping
Five bits are lost
XXXXX
25bit MAC address prefix
XXXXXXXX XXXXXXXX
XXXXX
25-bit MAC address prefix
XXXXXXXX XXXXXXXX XXXXXXXX1110XXXX
XXXXXXXX
XXXXXXXX1110XXXX
XXXXXXXX XXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX
…… ……
XXXXXXXX XXXXXXXX XXXXXXXX
…… ……
23-bit
mapping
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
MBGP/MSDP
PIM
PIM
AS1
AS2
Figure 1-6 Positions of protocols related to multicast
II. 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 routers.

Huawei Quidway S3900 Series Specifications

General

Brand	Huawei
Model	Quidway S3900 Series
Category	Switch
Language	English