CN105429881B - A kind of method for forwarding multicast message and device - Google Patents
A kind of method for forwarding multicast message and device Download PDFInfo
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Abstract
The present invention provides a kind of multicast data packet forwarding method and apparatus, which comprises when receiving multicast data message, data core is called to search and the matched multicast routing table item of the multicast data message；Data core is forwarded the multicast data message according to the multicast routing table item found.The present invention can search the multicast routing table item of multicast data message by calling data core, and be forwarded to multicast data message.Data core is set to share the operation burden of control core, to improve the forward efficiency of multicast message.
Description
Technical field
The present invention relates to the communication technology more particularly to a kind of method for forwarding multicast message and device.
Background technique
With the development of video communication technology, video monitoring, online live streaming, Web TV, long-distance education, tele-medicine,
People's lives are gradually goed deep into the information services such as network radio station, real-time video meeting.And network bandwidth resources are limited, how not
The quick transmission for guaranteeing data in the case where occupying massive band width, becomes particularly important.Due to the basic mould of above- mentioned information service
Formula is all single-point transmission, multipoint reception, and traditional unicast and broadcast communication mode is relied on to transmit data, and not only waste bandwidth provides
Source can also increase to source host to be loaded.Therefore, multicasting technology comes into being, to solve traditional unicast and broadcast communication mode not
The problem of single-point transmission, multipoint reception can be efficiently solved.
Multicast refers to data in IP (Internet Protocol, the agreement interconnected between network) network with as possible
The form of transmission is sent to the node set (i.e. multicast group) of some determination, and basic thought is: source host (i.e. multicast source) is only
A data are sent, destination address is multicast group address；All recipients in multicast group can receive same copy number
According to, and the host only in multicast group can receive the data, and other hosts cannot then receive.Therefore IP may be implemented
Point-to-multipoint efficient data transmission in network can largely save network bandwidth, reduce network load.
In the prior art, the classical networks such as firewall, security audit equipment does not have the function of router, but
Carry out multicast data forwarding by CPU (Central Processing Unit, central processing unit).The CPU of the usual above-mentioned network equipment
Structure is as shown in Figure 1.In RMI (Remote Method Invocation, remote method call) multi-core CPU (in dotted line frame
CPU1 and CPU2) each CPU core is divided into multiple hardware threads, each hardware thread is otherwise known as virtual cpu (VCPU).According to
Logical partitioning is handled, this 8 VCPU can be divided into control core and data core.Wherein, the first two VCPU (VCPU0, VCPU1) is used for
It controls core (shown in the left side scoring lines frame of figure midpoint), be mainly responsible for operation User space process and control the relevant treatment process of plane
(for example, processing protocol message, create route table items, issue route table items and processing multicast message etc.)；Remaining 6 VCPU
(VCPU2, VCPU3, VCPU4, VCPU5, VCPU6, VCPU7) is main negative for data core (on the right side of figure midpoint shown in scribing line frame)
The related procedure of duty operation unicast message forwarding.
Currently, since multicast message will be forwarded by control core, and controlling core (VCPU0, VCPU1) will not only locate
Various protocol massages are managed, a large amount of multicast message is also handled, cause control core load very big in this way, therefore multicast message is being controlled
Forwarding rate on core processed is very low, and generally per second to forward 50M flow, it is every that such forward efficiency is much unable to satisfy user
The requirement of second forwarding several hundred million.
Summary of the invention
The present invention provides a kind of multicast data packet forwarding method and apparatus to solve the overload of control core, forwarding effect
The too low problem of rate.
A kind of multicast data packet forwarding method, which comprises
When receiving multicast data message, data core is called to search and the matched multicast routing table of the multicast data message
?；
Data core is forwarded the multicast data message according to the multicast routing table item found.
Further, the method also includes:
When data core does not find multicast routing table item matched with the multicast data message, call control verify look for
The matched multicast routing table item of multicast data message；
Control core is forwarded the multicast data message according to the multicast routing table item found.
Further, the method also includes:
When control core does not find multicast routing table item matched with the multicast data message, control core is assisted according to multicast
View is that the multicast data message creates new multicast routing table item；
Control core is forwarded the multicast data message according to the new multicast routing table item.
Further, the method also includes:
When receiving multicast data message, which is subjected to flow point class；
The calling data core is searched with the matched multicast routing table item of the multicast data message
It is searched and matched group of the multicast data message according to the specified hardware thread in flow point class call by result data core
Broadcast route table items.
Further, the method also includes:
When receiving multicast data message, the calling data core is searched and the matched multicast path of the multicast data message
Include: by list item
The specified hardware thread in data core is called to search according to load balancing matched with the multicast data message
Multicast routing table item.
Based on identical design, the present invention also provides a kind of multicast data packet forwarding device, which is applied to network
Equipment, the network equipment include data core and control core, and described device includes calling module and the first forwarding module, wherein described
First forwarding module is located at data core；
The calling module when for receiving multicast data message, calls data core to search and the multicast data message
Matched multicast routing table item；
First forwarding module, for being turned according to the multicast routing table item found to the multicast data message
Hair.
Further, the calling module is also used to:
When not finding multicast routing table item matched with the multicast data message, calls control to verify and look for and described group
The multicast routing table item of multicast data message matching；
The control core includes the second forwarding module；
Second forwarding module, for being turned according to the multicast routing table item found to the multicast data message
Hair.
Further, the control core further include:
List item creation module, for when not finding multicast routing table item matched with the multicast data message, according to
Multicast protocol creates new multicast routing table item；
Second forwarding module is also used to turn the multicast data message according to the new multicast routing table item
Hair.
Further, described device further include:
Flow point generic module, for when receiving multicast data message, which to be carried out flow point class；
The calling module is also used to:
It is searched and matched group of the multicast data message according to the specified hardware thread in flow point class call by result data core
Broadcast route table items.
Further, the calling module is also used to:
The specified hardware thread in data core is called to search according to load balancing matched with the multicast data message
Multicast routing table item.
It can be seen that the present invention can search the multicast routing table item of multicast data message by calling data core, and
Multicast data message is forwarded.Data core is set to share the operation burden of control core, to improve multicast message
Forward efficiency.
Detailed description of the invention
Fig. 1 is a kind of logical construction schematic diagram of multi-core CPU of the prior art；
Fig. 2 is a kind of process flow diagram of multicast data packet forwarding method in the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of multicast data packet forwarding device in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another multicast data packet forwarding device in the embodiment of the present invention.
Specific embodiment
To solve the above problems, the present invention provides a kind of multicast data packet forwarding method and apparatus, by calling number
The multicast routing table item of multicast data message is searched according to core, and multicast data message is forwarded, and divides data core
The operation burden of load control core, to achieve the purpose that improve multicast message forward efficiency.
Below taking software implementation as an example, the present invention is described in detail implements.Multicast data message provided by the invention turns
Transmitting apparatus application is on network devices.As the operation carrier of apparatus of the present invention, the network equipment typically at least includes processing
Device, memory, internal bus, network interface and nonvolatile memory, certainly, be also possible that certainly forwarding chip and
The hardware such as I/O (input/output, input/output port) interface.It should also be noted that the network equipment is different from existing skill
The network equipments such as firewall, the security audit mentioned in art, the network equipment in the present embodiment is in addition to that can carry out network application
Processing is outer, the Routing Protocol on some bases is also supported, such as OSPF (Open Shortest Path First, open shortest path
Diameter is preferential) agreement and BGP (Border Gateway Protocol, Border Gateway Protocol) etc., so that the network equipment has road
By forwarding capability.The multicast message generally handled on the network equipment can logically be divided into multicast data message and multicast
Message is controlled, so-called multicast data message is to carry some multicast packet information, such as video flow；Multicast controls message then
It is the message that carry some protocol interaction information and control instruction etc.It can be seen from background technology that multicast numbers in the prior art
According to message and multicast control message by control consideration convey hair, therefore cause forward efficiency very low.And solution party provided by the invention
Case can make data core that control core processing multicast data message be replaced to improve forwarding effect to mitigate the processing load of control core
Rate.
Fig. 2, Fig. 3 and Fig. 4 are please referred to, the multicast data packet forwarding device 100 includes: 101 He of calling module
First forwarding module 102.Wherein first forwarding module 102 is located in the data core.In an illustrative embodiment party
In case, which executes following steps in the process of running:
S1, when receiving multicast data message, calling module search with the matched Multicast Routing of the multicast data message
List item；
In the embodiment of the present invention, when the above-mentioned network equipment receives multicast message, the multicast message can be first passed through
Feature field come distinguish the multicast message be multicast data message or multicast control message.There are many kinds of its differentiating methods, example
As whether being IGMP (Internet Group Management by the protocol number in the purpose IP address of the multicast message
Protocol, Internet igmpinternet) distinguish type of message, i.e., when protocol number is IGMP, then illustrate that the group is broadcasted
Text is multicast control message；It is on the contrary then illustrate that the multicast message is multicast data message.Multicast controls message still by control core
It handles, and for multicast data message, the calling module 101 in retransmission unit of the invention can then pass through the multicast
The information such as the source IP address (SIP) of data message, purpose IP address (DIP), the multicast routing table deposited in this device memory
Middle lookup and the matched multicast routing table item of multicast data message institute.
S2, the first forwarding module are forwarded the multicast data message according to the multicast routing table item found.
Since above-mentioned DIP is the public network IP address of multicast group, the private of each multicast member is usually noted in the multicast group
Net IP address and the corresponding outgoing interface of each private network IP address, therefore usually wrapped in the multicast routing table item found
Include SIP, DIP (which includes the private network IP address of each multicast member and corresponding outgoing interface).First forwarding module
The multicast data message can be replicated according to the multicast routing table item found and be transmitted to the corresponding multicast group of the DIP by 102
Each of broadcast member.
It can be seen that the present invention can make data core carry out multicast data forwarding message by searching for multicast routing table item, from
And share the operation burden of control core.By taking the CPU in Fig. 1 as an example, it is assumed that the VCPU0 in control core is responsible for multicast data forwarding report
Text, forwarding rate are 50M/s, and retransmission unit of the invention can make data core replace control consideration convey hair multicast datagram
Text, due to there is 6 VCPU in data core, it is assumed that the processing capacity of each VCPU is identical, then verification of data is in multicast datagram
The forwarding rate of text is equivalent to 6 times of control core forwarding rate, that is, 50M/s*6=300M/s (is theoretic above
Calculated result, actual forwarding rate is related with configuration according to equipment performance itself, shows turning for the device according to dependence test
Hair band width can reach 4Gbps or more, be equivalent to 521M/s).Obviously, the present invention can pass through data core multicast data forwarding report
Text promotes the forward efficiency of message.
Since data core will be by searching for the multicast routing table multicast data forwarding message in memory, and the multicast in memory
Routing table is saved in memory after control core creates, and in some cases, data core possibly can not be found and multicast number
According to the multicast routing table item of message matching, such as when forwarding a multicast data message first appeared, also due to control core
Multicast routing table item is not created for the multicast data message first appeared, then data core is just searched not in multicast routing table
To with the matched multicast routing table item of the multicast data message.Therefore in optional embodiment of the present invention, above-mentioned calling mould
Block can also further call control core to remove lookup and the matched multicast routing table item of the multicast data message, so that control core
In the second forwarding module the multicast data message is forwarded, the principle of the second forwarding module multicast data forwarding message
Identical as above-mentioned first forwarding module, details are not described herein again.
It should be noted that the multicast path that the multicast routing table of above-mentioned control core should theoretically be looked for data check before
It is same table by table, but in practical solution, since control core creates new multicast from the multicast data message that processing is completed
Route table items are updated into memory so that data core is able to access that the list item to by multicast routing table item, during which be usually there will be
Certain delay, this " delay ", the multicast routing table that control core may be made to use have been updated to a new Multicast Routing
Table, and data core is added to new multicast in the new multicast routing table also using multicast routing table original in memory
Route table items, and do not update the new multicast routing table item in multicast routing table in memory also.If data core receives at this time
One multicast data message, SIP and DIP in the new multicast routing table item SIP and DIP it is identical, then data core
The multicast routing table item to match with the multicast data message can not be then found in the multicast routing table of memory, and is being controlled
It can be found in core, therefore data core can be sent to control core for being not matched on the multicast data message of multicast routing table item
Processing.
It, can be before control verifies and looks for multicast routing table, by control core in optional embodiment of the invention
The message accounting table of preservation first carries out primary screening to message to be forwarded, to filter out and control the new multicast path of core
By there are the multicast data messages of identical SIP and DIP in table, to avoid control core from being reprocessed, to further mention
High forward efficiency.As an example it is assumed that when control core receives multicast data message (SIP=IPA, a DIP=IPB), it can be with
The SIP and DIP for first extracting the multicast data message are searched in the message accounting table that control core itself saves.
When including SIP=IPA in the message accounting table, when the multicast data message of DIP=IPB, then illustrate to control core
New multicast routing table in exist with above-mentioned SIP=IPA, the multicast data message of DIP=IPB is with identical SIP's and DIP
Multicast routing table item is not dealt with temporarily then the multicast data message is checked in control, to avoid the to be processed of control core
Occurs the message of identical SIP and DIP in queue.After updating the multicast routing table in data core etc. core to be controlled, control core will
The corresponding multicast routing table item of SIP=IPA, DIP=IPB is added in former multicast routing table, then data core at this time
Multicast data message (SIP=IPA, the DIP=that above-mentioned control core is not handled temporarily again according to updated multicast routing table
IPB it) is forwarded.
When not including SIP=IPA in the message accounting table, when the multicast data message of DIP=IPB, illustrate to control core
Have identical SIP's and DIP there is no the multicast data message with above-mentioned SIP=IPA, DIP=IPB in new multicast routing table
Multicast routing table item controls the untreated multicast data message of core in other words.So in order to forward the message, control in core
List item creation module can be that the multicast data message creates new multicast routing table item according to multicast protocol；The multicast association
View generally includes IGMP agreement and PIM (protocol independent multicast, Protocol Independent Multicast) agreement, controls
Core can be that the multicast data message creates new multicast routing table according to the PIM routing table generated under above-mentioned multicast protocol
, and then the multicast data message can be turned according to the newly created multicast routing table item by the second forwarding module
Hair.
As shown in Figure 1, the quantity of VCPU is typically greater than the quantity for controlling VCPU in core in data core, therefore data core is usual
Also there are more system resources than control core, such as hardware thread and caching, apparatus for forwarding message through the invention can be with
The resource of data core is made full use of, is not only to control to examine and make cuts gently to be born, the forward efficiency of multicast message can also be improved.
For the VCPU resource of reasonable distribution data core, in optional embodiment of the present invention, data core can be using such as
Lower two kinds of processing modes are forwarded multicast data message:
One is flow mode classification.Described device in the embodiment of the present invention can be to the message for above sending data core to handle
It can carry out stream classification processing.For the network equipment in Fig. 1, detailed process is as follows for the stream classification processing:
When receiving multicast data message, which is carried out flow point class by flow point generic module；Wherein flow point
The mode of class can be by message characteristic carry out flow point class, such as classified according to address field belonging to SIP or by
Classified according to the incoming interface of message or carries out flow point class according to signature identification, the five-tuple information etc. of message carrying.With
For being classified according to address field belonging to SIP, administrator can be opened stream classification chart with configured in advance one and is stored in this equipment,
Include multiple address fields and the corresponding VCPU of each address field in table, such as SIP is belonged to the multicast datagram of the first address field
Text will be handled by VCPU2；The SIP multicast data message for belonging to the second address field will be handled by VCPU3, and so on.The stream
Classification chart is as follows:
| Address field | VCPU | Address field | VCPU |
| First address field | VCPU2 | 4th address field | VCPU5 |
| Second address field | VCPU3 | 5th address field | VCPU6 |
| Third address field | VCPU4 | 6th address field | VCPU7 |
Table 1
When the equipment receives multicast data message, calling module 101 can be according to the SIP institute of the multicast data message
The address field of category finds the corresponding flow point class of the multicast data message as a result, so as to call data core from stream classification chart
In specified VCPU (really hardware thread) come search with the matched multicast routing table item of the multicast data message, to realize
Forwarding to the multicast data message.All messages wait the phenomenon that VCPU processing, this stream in compared with the existing technology
The mode of classification can be fully used with the VCPU in data core, and Message processing efficiency can be made to obtain promotion at double.
Another is load balancing mode.Wherein, calling module 101 can also call number according to load balancing
According in core specified hardware thread search with the matched multicast routing table item of the multicast data message, be with the data core in Fig. 1
Example, first multicast data message are handled by VCPU2, and second multicast data message is handled by VCPU3, third multicast packet
Message is handled by VCPU4, and the 4th multicast data message is handled by VCPU5, and the 5th multicast data message is handled by VCPU6,
6th multicast data message is handled by VCPU7, and the 7th multicast data message is handled by VCPU2 again, is so recycled, thus
Each VCPU in data core is set to be fully used.Since load-balancing technique has been more mature skill in this field
Art does not elaborate herein.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (8)
1. a kind of multicast data packet forwarding method, which is characterized in that the described method includes:
When receiving multicast data message, data core is called to search and the matched multicast routing table item of the multicast data message；
Data core is forwarded the multicast data message according to the multicast routing table item found；
When data core does not find multicast routing table item matched with the multicast data message, call control verify look for it is described
The matched multicast routing table item of multicast data message；
Control core is forwarded the multicast data message according to the multicast routing table item found.
2. the method as described in claim 1, which is characterized in that the method also includes:
When control core does not find multicast routing table item matched with the multicast data message, controlling core according to multicast protocol is
The multicast data message creates new multicast routing table item；
Control core is forwarded the multicast data message according to the new multicast routing table item.
3. the method as described in claim 1, which is characterized in that the method also includes:
When receiving multicast data message, which is subjected to flow point class；
The calling data core is searched with the matched multicast routing table item of the multicast data message
It is searched and the matched multicast path of the multicast data message according to the specified hardware thread in flow point class call by result data core
By list item.
4. the method as described in claim 1, which is characterized in that the method also includes:
When receiving multicast data message, the calling data core is searched and the matched multicast routing table of the multicast data message
Include:
The specified hardware thread in data core is called to search and the matched multicast of the multicast data message according to load balancing
Route table items.
5. a kind of multicast data packet forwarding device, which is applied to the network equipment, which includes data core and control
Core processed, which is characterized in that described device includes calling module and the first forwarding module, wherein first forwarding module is located at number
According to core；The control core includes the second forwarding module；
The calling module when for receiving multicast data message, calls data core lookup to match with the multicast data message
Multicast routing table item；
First forwarding module, for being forwarded according to the multicast routing table item found to the multicast data message；
The calling module is further used for when not finding multicast routing table item matched with the multicast data message, adjusts
It is verified and is looked for and the matched multicast routing table item of the multicast data message with control；
Second forwarding module, for being forwarded according to the multicast routing table item found to the multicast data message.
6. device as claimed in claim 5, which is characterized in that the control core further include:
List item creation module, for when not finding multicast routing table item matched with the multicast data message, according to multicast
Agreement creates new multicast routing table item；
Second forwarding module is also used to be forwarded the multicast data message according to the new multicast routing table item.
7. device as claimed in claim 5, which is characterized in that described device further include:
Flow point generic module, for when receiving multicast data message, which to be carried out flow point class；
The calling module is also used to:
It is searched and the matched multicast path of the multicast data message according to the specified hardware thread in flow point class call by result data core
By list item.
8. device as claimed in claim 5, which is characterized in that the calling module is also used to:
The specified hardware thread in data core is called to search and the matched multicast of the multicast data message according to load balancing
Route table items.
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| CN106506402B (en) * | 2016-10-21 | 2019-08-23 | 中国科学院声学研究所 | A kind of unrelated forwarding flow caching method of agreement |
| CN107979535B (en) * | 2017-10-31 | 2021-03-02 | 新华三技术有限公司 | Message forwarding method and device |
| CN108366024A (en) * | 2018-02-07 | 2018-08-03 | 迈普通信技术股份有限公司 | Message forwarding method and device |
| CN108632125B (en) * | 2018-04-23 | 2020-12-29 | 新华三技术有限公司 | Multicast table item management method, device, equipment and machine readable storage medium |
| CN113176950B (en) * | 2021-04-09 | 2023-10-27 | 杭州迪普科技股份有限公司 | Message processing method, device, equipment and computer readable storage medium |
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| CN101217520A (en) * | 2007-12-29 | 2008-07-09 | 华为技术有限公司 | A wireless packet domain gateway performance self-adapting method and device |
| CN101867518A (en) * | 2010-05-24 | 2010-10-20 | 北京星网锐捷网络技术有限公司 | Message forwarding processing method, processing device and equipment for two-layer switching equipment |
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| CN101217520A (en) * | 2007-12-29 | 2008-07-09 | 华为技术有限公司 | A wireless packet domain gateway performance self-adapting method and device |
| CN101867518A (en) * | 2010-05-24 | 2010-10-20 | 北京星网锐捷网络技术有限公司 | Message forwarding processing method, processing device and equipment for two-layer switching equipment |
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Address after: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Applicant after: Hangzhou Dipu Polytron Technologies Inc Address before: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Applicant before: Hangzhou Dipu Technology Co., Ltd. |
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