A multicast forwarding method and a multicast router
A forwarding method and router technology, applied in the information field, can solve problems such as multicast services cannot be automatically restored, and achieve the effect of reducing network bandwidth consumption
Active Publication Date: 2020-09-08
HUAWEI TECH CO LTD
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Problems solved by technology
Among them, the Protocol Independent Multicast-Sparse Mode (Protocol Independent Multicast-Sparse Mode, PIM-SM) protocol is currently a highly recognized multicast routing protocol, but there are still various defects in the PIM-SM protocol, for example, the IP group All routers in the broadcast network must support the PIM-SM protocol, and once a router running PIM-SM goes down, the multicast services of the terminals connected to the branch tree of the router will not be automatically restored
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[0047] The application will be described in further detail below in conjunction with the accompanying drawings.
[0048] The multicast forwarding method in this application can be applied to various communication systems, figure 1 A schematic diagram of one of the communication systems to which this application applies. The communication system includes a data source server, a rendezvous point (rendezvous point, RP), a multicast router (Multicast Router, MCR) 1 , MCR2 , R1 to R8 , and terminals 1 to 5 .
[0049] Wherein, RP, MCR1, and MCR2 are multicast routers supporting multicast introduced in the embodiment of the present application. R1 to R8 belong to ordinary routers and do not support the multicast function. Terminals 1 to 5 can be computer equipment or various mobile terminal equipment. It should be noted that the RP is a special multicast router. In addition to the multicast function, it is also responsible for allocating group identifiers of multicast groups and in...
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A multicast forwarding method and a multicast router, the method comprising: a first multicast router monitors a plurality of unicast packets flowing through itself, and determines a set of unicast packets from the same upstream multicast router and belonging to the same unicast flow ; Then the first multicast router determines that the destination addresses of at least two unicast packets in the unicast packet set are different, and sends a pruning message to the upstream multicast router; finally, the first multicast router Sending the received unicast message with the multicast identifier to each destination device corresponding to the destination address group, this method is used to provide a new multicast method, which can be used in the existing unicast network architecture Realize the multicast function of some routers.
Description
technical field [0001] The present application relates to the field of information technology, in particular to a multicast forwarding method and a multicast router. Background technique [0002] One implementation of Internet Protocol (IP) network communication is unicast, which is characterized by transmitting one message to one receiver at a time; another implementation is broadcast, which is characterized by transmitting one message at a time to sub- All receivers in the network. When there are multiple receivers in the network, the unicast mode will cause multiple copies of the same message to exist in the IP network, and repeatedly occupy network resources and server resources, so the transmission efficiency is low. However, the broadcast method cannot cover different subnets, otherwise broadcast storms will be caused. Therefore, the multicast transmission method of "transmitting a message to multiple receivers at a time" came into being. [0003] IP multicast uses ...
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IPC IPC(8): H04L12/741H04L12/761H04L45/74H04L45/16
CPCH04L45/16H04L45/745H04L12/1854H04L12/1886H04L12/18H04L45/74
Inventor 孟锐王闯黄勇
Owner HUAWEI TECH CO LTD