CN102377646A - Forwarding chip, network switching system and multicast implementation method - Google Patents
Forwarding chip, network switching system and multicast implementation method Download PDFInfo
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Abstract
The invention discloses a network switching system which is used for multicast transmission for realizing duplication to multiple destinations. The network switching system comprises a forwarding chip having an encapsulation chip and a decapsulation chip, wherein the encapsulation chip comprises a first inlet processing engine and a first outlet processing engine; the decapsulation chip comprises a second inlet processing engine and a second outlet processing engine; the first inlet processing engine is used for processing a received multicast message; the first outlet processing engine is used for carrying out tunnel encapsulation on the multicast message through a preset tunnel, setting a tunnel head on the multicast message to form a tunnel message and then sending out the tunnel message; and after the second inlet processing engine of the decapsulation chip receives the tunnel message, the tunnel message is decapsulated and transmitted into the second outlet processing engine for forwarding the multicast message. Thus, through the forwarding chip, the multicast message can penetrate through multiple network environments, especially some network environments not supporting multicast, thereby greatly expanding the multicast application scenes.
Description
[technical field]
The present invention relates to a kind of network communications technology, especially support multicasting technology forwarding chip, possess the internet exchange system of this forwarding chip and by the method for realizing group broadcasting of this forwarding chip.
[background technology]
In data communication, in order to realize efficient data transmission, conserve network bandwidth, the reduction offered load of network mid point to multiple spot, increasing manufacturer begins to support multicast service.Utilize multicasting technology, can provide some easily like information services such as Web TV, online live, video conferences.Traditional multicasting technology is multicast information to be duplicated with port through Virtual Local Area Network duplicate, and duplicates away from VLAN interface and three layers of physical port, to realize the distribution of duplicating of multicast information.Yet traditional multicast replication can only copy on physical port and the VLAN interface, can not copy to the interface of other type, so greatly limit the application scenarios of multicast.
So be necessary to design a kind of novel support multicasting technology forwarding chip, possess the internet exchange system of this forwarding chip and by the method for realizing group broadcasting of this forwarding chip to solve the problems of the technologies described above.
[summary of the invention]
Technical problem to be solved by this invention is to provide a kind of and passes through the forwarding chip that go-between carries out multicast transmission, the internet exchange system that possesses this forwarding chip and by the method for realizing group broadcasting of this forwarding chip.
For solving the problems of the technologies described above; The present invention adopts following technical scheme: a kind of forwarding chip; Comprise: packaged chip and decapsulation chip; Said packaged chip comprises that first goes into processing engine and first and go out processing engine, and said decapsulation chip comprises that second goes into processing engine and second and go out processing engine; Said first goes into processing engine handles the multicast message of receiving; First goes into processing engine searches according to multicast message entrained source address and group address; And with the outcome record of searching in the descriptor of multicast message, descriptor is admitted to first subsequently and goes out processing engine; Said first goes out processing engine finds list item corresponding in the packaged chip according to the foregoing description result of information; Duplicate distribution; After duplicating completion; Through tunnel preset in the list item multicast message is carried out tunnel encapsulation again and the tunnel head is set to form channel message on multicast message, channel message is issued subsequently; Second of said decapsulation chip is gone into after processing engine receives above-mentioned channel message; Channel message is carried out decapsulation; Then will be not being looped back to second again with the multicast message of tunnel head goes into processing engine and handles; Second goes into processing engine searches according to source address in the multicast message and group address; And the result that will search is put in the descriptor of multicast message, delivers to after one or more purpose chip, these descriptors sent into second go out processing engine and go out the forwarding that processing engine is proceeded multicast message through second.
As further improvement of the present invention, said forwarding chip is placed in the go-between of not supporting multicast, and channel message transmits through this go-between.
For solving the problems of the technologies described above, the present invention can also adopt following technical scheme: a kind of internet exchange system, and in order to pass the network of not supporting multicast to realize multicast transmission, said internet exchange system comprises:
First network, said first network comprises first router in order to the transport multicast message;
Second network, said second network comprises the 4th router in order to the transport multicast message; And
Do not support the go-between of multicast, said go-between comprises that the secondary route device of supporting multicast and the Third Road of supporting multicast are by device;
Said secondary route device is provided with packaged chip, and said packaged chip comprises that first goes into processing engine and first and go out processing engine; Said Third Road is provided with the decapsulation chip by device, and said decapsulation chip comprises that second goes into processing engine and second and go out processing engine; Said first goes into processing engine handles the multicast message that is spread out of by first router; Said first go out processing engine according to first go into processing engine result find in the packaged chip corresponding list item to duplicate distribution; After duplicating completion, through tunnel preset in the list item multicast message is carried out tunnel encapsulation again and the tunnel head is set on multicast message to form channel message; Second of said decapsulation chip is gone into after processing engine receives above-mentioned channel message; Channel message is carried out decapsulation; Then will be not be looped back to second again and go into processing engine and handle, and said second goes out the multicast message of processing engine after with decapsulation and transmit to the 4th router with the multicast message of tunnel head.
As further improvement of the present invention, said channel message is IP message or multiprotocol label switching (mpls) message.
For solving the problems of the technologies described above, the present invention can also adopt following technical scheme: a kind of method of realizing group broadcasting comprises:
(a). a kind of forwarding chip is provided, and it comprises packaged chip and decapsulation chip, and said packaged chip comprises that first goes into processing engine and first and go out processing engine, and said decapsulation chip comprises that second goes into processing engine and second and go out processing engine;
(b). first of the multicast message entering packaged chip of receiving is gone into processing engine handle; First goes into processing engine searches according to multicast message entrained source address and group address; And with the outcome record of searching in the descriptor of multicast message, these descriptors get into and are admitted to first after one or more purpose chips and go out processing engine;
(c). first goes out processing engine finds list item corresponding in the packaged chip according to the foregoing description result of information; Duplicate distribution; After duplicating completion; Through tunnel preset in the list item multicast message is carried out tunnel encapsulation again and the tunnel head is set to form channel message on multicast message, channel message is issued subsequently;
(d). second of decapsulation chip is gone into after processing engine receives above-mentioned channel message; Channel message is carried out decapsulation; Then will be not be looped back to second again with the multicast message of tunnel head and go into processing engine and handle, second goes into processing engine searches according to source address in the multicast message and group address, and the result that will search is put in the descriptor of multicast message; Deliver to after one or more purpose chip, these descriptors are sent into second go out processing engine;
(e). second goes out the forwarding that processing engine is proceeded multicast message.
As further improvement of the present invention, in the step (b),, multicast message is done backward channel transmit (RPF) inspection when when the source address of multicast message and group address are searched.
As further improvement of the present invention, in the step (c), multicast message is placed in the payload in tunnel.
As further improvement of the present invention, in the step (c), channel message is the message of non-multicast type.
As further improvement of the present invention, said channel message is IP message or multiprotocol label switching (mpls) message.
As further improvement of the present invention, in the step (c), channel message is transmitted by the go-between of not supporting multicast.
Compared to prior art, the present invention makes multicast message can pass through the multiple network environment through packaged chip and decapsulation chip, does not more support the go-between of multicast, thereby has expanded the application scenarios of multicast greatly.
[description of drawings]
Fig. 1 is the sketch map of internet exchange system first execution mode of the present invention.
Fig. 2 is the process chart of the packaged chip of forwarding chip of the present invention to multicast message.
Fig. 3 is the process chart of the decapsulation chip of forwarding chip of the present invention to channel message.
Fig. 4 is the sketch map of another execution mode of internet exchange system of the present invention.
[embodiment]
Fig. 1 has disclosed internet exchange system of the present invention, and it comprises first network (regional A), second network (zone C) and the go-between (area B) between first network and second network.Said regional A comprises the first router R1 in order to the transport multicast message.Said zone C comprises the 4th router R4 in order to the transport multicast message.Said regional A and zone C all are to support the zone of multicast, and area B is not support the zone of multicast.Said area B comprises that secondary route device R2 that supports multicast and the Third Road of supporting multicast are by device R3.In order to make internet exchange system of the present invention can pass the area B of not supporting multicast, area B is provided with forwarding chip.Said forwarding chip comprises the packaged chip 10 (joining shown in Figure 2) that is arranged on the secondary route device R2 and is arranged at Third Road by the decapsulation chip 20 on the device R3 (joining shown in Figure 3).Substantially, the packaged chip 10 of said secondary route device R2 is encapsulated in multicast message within the tunnel, as the load in tunnel, in area B, is transmitted by device R3 clean culture to Third Road according to the outer layer tunnel head.And Third Road carries out decapsulation by the decapsulation chip 20 of device R3 with the tunnel head, sends to the 4th router R4 to the multicast message of the inside, proceeds multicast forwarding, thereby passes the area B of not supporting multicast, realizes multicast transmission.That is to say that the course of work of forwarding chip mainly is divided into two parts: one is the process of carrying out tunnel encapsulation, and another one is the process of decapsulation, specifies as follows:
When normal multicast message is dealt into secondary route device R2 from the first router R1, what on secondary route device R2, carry out is exactly the process of multicast message being carried out tunnel encapsulation.Please join shown in Figure 3; Said packaged chip 10 comprises that first goes into processing engine 11 and first and go out processing engine 12; When getting into first of packaged chip 10, normal multicast message goes into processing engine 11; First to go into processing engine 11 mainly be to search according to source address of carrying in the multicast message and group address, do backward channel according to incoming interface simultaneously and transmit (RPF) inspection, and with the outcome record of searching in the descriptor of multicast message.Certainly, this descriptor is just described some key messages of this multicast message, such as first go into processing engine 11 result, do not comprise the content of this multicast message itself.At this moment, the content of this multicast message itself can be stored among the buffer (buffer).After the descriptor of the multicast message of accomplishing handle gets into one or more purpose chip, just give first and go out processing engine 12 and handle.Said first goes out processing engine 12 finds list item corresponding in the packaged chip 10 according to the result in the descriptor, duplicates distribution.After duplicating completion, come multicast message is done tunnel encapsulation through tunnel preset in the list item again.Multicast message be placed in the payload (payload) in tunnel and in the skin encapsulation tunnel head send from corresponding port to form channel message.According to the difference of the tunnel type that encapsulates, the channel message that sends out can be the message of non-multicast types such as IP message or multiprotocol label switching (mpls) message.
Please join shown in Figure 4ly, said decapsulation chip 20 comprises that second goes into processing engine 21 and second and go out processing engine 22.Through the channel message of above-mentioned encapsulation, arrive Third Road afterwards through go-between by device R3 (joining shown in Figure 1), what carry out on by device R3 at Third Road is exactly the decapsulation process of channel message.Because Third Road is termination point of a tunnel by device R3, therefore, Third Road is gone into the thing that processing engine 21 at first will do by second of device R3 and exactly channel message is carried out the tunnel decapsulation.After the decapsulation, go into processing engine 21 and handle not being looped back to second again with the multicast message of tunnel head.Second goes into processing engine 21 searches according to source address in the multicast message and group address; The result who searches is put in the descriptor of multicast message; After delivering to one or more purpose chip; Give second with the descriptor of multicast message and go out processing engine 22, continue to do common multicast forwarding to the 4th router R4 of zone C.Through after the above-mentioned processing, this did not support the area B of multicast in the middle of multicast message had successfully passed through.
The present invention can also copy to the interface of multiple other type through forwarding chip except can multicast message being copied to General Physics mouth and the VLAN interface.Through method of realizing group broadcasting of the present invention, can realize multiple multicast application, pass through the multiple network environment, more do not support the network environment of multicast, expanded the application scenarios of multicast greatly.
Realize that forwarding chip that the present invention adopted except this special ASIC chip of mentioning in this execution mode, can also adopt other chip of supporting this function, such as some network processes chip NP etc.
Certainly; Please join shown in Figure 4; More under the complicated situation, the secondary route device R2 of said area B can copy to multicast message on a plurality of different tunnel interfaces in practical application, the channel message of receiving is carried out decapsulation at Third Road on by device R3 and the 5th router R5; Be forwarded to again on the 4th router R4 and the 6th router R6 of zone C and carry out multicast forwarding, can realize the object of the invention equally.
In sum; More than be merely preferred embodiment of the present invention; Should not limit scope of the present invention with this, promptly every simple equivalent of being done according to claims of the present invention and description of the invention content changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (10)
1. forwarding chip comprises: packaged chip and decapsulation chip, said packaged chip comprise that first goes into processing engine and first and go out processing engine, and said decapsulation chip comprises that second goes into processing engine and second and go out processing engine; Said first goes into processing engine handles the multicast message of receiving; First goes into processing engine searches according to multicast message entrained source address and group address; And with the outcome record of searching in the descriptor of multicast message, descriptor is admitted to first subsequently and goes out processing engine; Said first goes out processing engine finds list item corresponding in the packaged chip according to the foregoing description result of information; Duplicate distribution; After duplicating completion; Through tunnel preset in the list item multicast message is carried out tunnel encapsulation again and the tunnel head is set to form channel message on multicast message, channel message is issued subsequently; Second of said decapsulation chip is gone into after processing engine receives above-mentioned channel message; Channel message is carried out decapsulation; Then will be not being looped back to second again with the multicast message of tunnel head goes into processing engine and handles; Second goes into processing engine searches according to source address in the multicast message and group address; And the result that will search is put in the descriptor of multicast message, delivers to after one or more purpose chip, these descriptors sent into second go out processing engine and go out the forwarding that processing engine is proceeded multicast message through second.
2. forwarding chip as claimed in claim 1 is characterized in that: said forwarding chip is placed in the go-between of not supporting multicast, and channel message transmits through this go-between.
3. internet exchange system, in order to pass do not support multicast network to realize multicast transmission, said internet exchange system comprises:
First network, said first network comprises first router in order to the transport multicast message;
Second network, said second network comprises the 4th router in order to the transport multicast message; And
Do not support the go-between of multicast, said go-between comprises that the secondary route device of supporting multicast and the Third Road of supporting multicast are by device; It is characterized in that:
Said secondary route device is provided with packaged chip, and said packaged chip comprises that first goes into processing engine and first and go out processing engine; Said Third Road is provided with the decapsulation chip by device, and said decapsulation chip comprises that second goes into processing engine and second and go out processing engine; Said first goes into processing engine handles the multicast message that is spread out of by first router; Said first go out processing engine according to first go into processing engine result find in the packaged chip corresponding list item to duplicate distribution; After duplicating completion, through tunnel preset in the list item multicast message is carried out tunnel encapsulation again and the tunnel head is set on multicast message to form channel message; Second of said decapsulation chip is gone into after processing engine receives above-mentioned channel message; Channel message is carried out decapsulation; Then will be not be looped back to second again and go into processing engine and handle, and said second goes out the multicast message of processing engine after with decapsulation and transmit to the 4th router with the multicast message of tunnel head.
4. internet exchange system as claimed in claim 3 is characterized in that: said channel message is IP message or multiprotocol label switching (mpls) message.
5. method of realizing group broadcasting comprises:
(a). a kind of forwarding chip is provided, and it comprises packaged chip and decapsulation chip, and said packaged chip comprises that first goes into processing engine and first and go out processing engine, and said decapsulation chip comprises that second goes into processing engine and second and go out processing engine;
(b). first of the multicast message entering packaged chip of receiving is gone into processing engine handle; First goes into processing engine searches according to multicast message entrained source address and group address; And with the outcome record of searching in the descriptor of multicast message, these descriptors get into and are admitted to first after one or more purpose chips and go out processing engine;
(c). first goes out processing engine finds list item corresponding in the packaged chip according to the foregoing description result of information; Duplicate distribution; After duplicating completion; Through tunnel preset in the list item multicast message is carried out tunnel encapsulation again and the tunnel head is set to form channel message on multicast message, channel message is issued subsequently;
(d). second of decapsulation chip is gone into after processing engine receives above-mentioned channel message; Channel message is carried out decapsulation; Then will be not be looped back to second again with the multicast message of tunnel head and go into processing engine and handle, second goes into processing engine searches according to source address in the multicast message and group address, and the result that will search is put in the descriptor of multicast message; Deliver to after one or more purpose chip, these descriptors are sent into second go out processing engine;
(e). second goes out the forwarding that processing engine is proceeded multicast message.
6. method of realizing group broadcasting as claimed in claim 5 is characterized in that: in the step (b), when when the source address of multicast message and group address are searched, multicast message is done backward channel transmit (RPF) inspection.
7. method of realizing group broadcasting as claimed in claim 5 is characterized in that: in the step (c), multicast message is placed in the payload in tunnel.
8. method of realizing group broadcasting as claimed in claim 5 is characterized in that: in the step (c), channel message is the message of non-multicast type.
9. method of realizing group broadcasting as claimed in claim 8 is characterized in that: said channel message is IP message or multiprotocol label switching (mpls) message.
10. like any described method of realizing group broadcasting in the claim 5 to 9, it is characterized in that: in the step (c), channel message is transmitted by the go-between of not supporting multicast.
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| CN114301737A (en) * | 2021-12-29 | 2022-04-08 | 迈普通信技术股份有限公司 | Network configuration method and device, network equipment and computer readable storage medium |
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Application publication date: 20120314 |