CN108400939B - System and method for realizing accelerated multicast replication in NFV (network File System) - Google Patents
System and method for realizing accelerated multicast replication in NFV (network File System) Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/16—Multipoint routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/20—Support for services
- H04L49/201—Multicast operation; Broadcast operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L49/00—Packet switching elements
- H04L49/25—Routing or path finding in a switch fabric
- H04L49/252—Store and forward routing
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Abstract
The invention relates to a system and a method for realizing accelerated multicast replication in NFV, comprising hardware equipment, a forwarding plane and a control plane, wherein the hardware equipment is used for receiving and replicating multicast messages and forwarding the multicast messages according to a multicast forwarding table; the forwarding plane is used for generating a multicast forwarding table and issuing the multicast forwarding table to the hardware equipment, and uploading a multicast message to the control plane; the control plane is used for generating a user multicast table according to the multicast message and sending the user multicast table to the forwarding plane. The system and the method for realizing the accelerated multicast replication in the NFV are used for the latest scenes of SDN, NFV and the like, solve the problem of user multicast messages under the condition of soft forwarding, sink the multicast messages needing software replication to hardware equipment for being replicated by the hardware equipment by matching with the hardware equipment, can greatly improve the forwarding performance, avoid the influence on unicast messages, improve the multicast efficiency, release CPU resources and indirectly improve the efficiency of other services.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to the field of replication and forwarding of multicast messages, and specifically relates to a system and a method for realizing accelerated multicast replication in NFV.
Background
NFV (network function virtualization) is a method for reducing the cost of expensive network equipment by using generic hardware equipment such as X86 and virtualization technologies to carry very many functions of software processing, and can be decoupled and abstracted in function by software and hardware equipment, so that the functions of network equipment do not depend on dedicated hardware equipment, resources can be shared flexibly, rapid development and deployment of new services are realized, and automatic deployment, elastic expansion, fault isolation, self-healing and the like are performed based on actual service requirements.
The network function can be in an On-demand mode, no new device needs to be additionally installed, an operator can run a virtual machine On an X86 platform to execute an open-source firewall function based On software, no new hardware device facilities need to be added, and the same functions such as CDN, NAT, DPI, VPN, IPTV, router, P-GW, IMS and the like can be realized through NFV-based software.
There are two ways of traditional IP communication: (1) unicast: peer-to-peer communication between a source host and a destination host; (2) broadcasting: point-to-multipoint communication between a source host and all other hosts in the same network segment. If the information is to be sent to a plurality of hosts, not all hosts, if a broadcasting mode is adopted, not only the bandwidth is wasted because the information is sent to the host which is not needed, but also cross-network segment sending cannot be realized; if the unicast mode is adopted, the repeated IP packets not only occupy a large amount of bandwidth, but also increase the load of the source host. Therefore, the conventional unicast and broadcast communication methods cannot effectively solve the problems of unicast transmission and multicast reception.
Multicast refers to the best effort delivery of data packets to a certain set of nodes (i.e. a multicast group) in an IP network, and the basic idea is: the source host (namely the multicast source) only sends one piece of data, and the destination address of the source host is a multicast group address; all receivers in the multicast group may receive the same copy of the data and only hosts within the multicast group may receive the data while other hosts may not.
Referring to fig. 1, when implementing a multicast function, a common router only needs to copy and distribute a packet to a required interface, where the number of copies is at most equal to the number of interfaces minus one (i.e., multicast to all interfaces). When NFV is used as VBRAS at the access end, the users who demand multicast traffic become users, the number of users is very large, and in extreme cases, 64k or even 128k users are reached, and at this time, if a software forwarding mode is still used, not only the performance is far from sufficient, but also the forwarding of unicast messages may be adversely affected.
Disclosure of Invention
The present invention aims to provide a system and a method for sinking the multicast message needing software copy to the hardware device and delivering the multicast message to the NFV copied by the hardware device to realize the acceleration of multicast copy, which overcome the disadvantages of the prior art.
In order to achieve the above object, the system and method for implementing multicast replication acceleration in NFV of the present invention are as follows:
the system for realizing the accelerated multicast replication in the NFV is mainly characterized by comprising hardware equipment, a forwarding plane and a control plane which are sequentially connected, wherein,
the hardware equipment is used for receiving and copying the multicast message and forwarding the multicast message according to the multicast forwarding table;
the forwarding plane is used for generating a multicast forwarding table, issuing the multicast forwarding table to the hardware equipment, and sending the multicast message received by the hardware equipment to the control plane;
the control plane is used for generating a three-layer multicast table and a user multicast table according to the multicast message and sending the three-layer multicast table and the user multicast table to the forwarding plane.
Preferably, the forwarding plane generates the multicast forwarding table according to the three-layer multicast table and the user multicast table after inquiring that the forwarding plane has the three-layer multicast table.
Preferably, the control plane generates a user multicast table according to the IGMP content of the multicast packet.
Preferably, the hardware device comprises a P4 switch.
The method for realizing the accelerated multicast replication in the NFV based on the system is mainly characterized by comprising the following steps:
(1) after receiving the multicast message, the hardware equipment checks whether a multicast forwarding table exists, and if so, the hardware equipment performs copy forwarding according to the existing multicast forwarding table; if not, continuing the step (2);
(2) the hardware device sends the received multicast message to the forwarding plane, the forwarding plane inquires whether a three-layer multicast table exists, if so, the step (4) is continued; if not, continuing the step (3);
(3) the forwarding plane sends the multicast message to the control plane, the control plane generates a three-layer multicast table and a user multicast table according to the received multicast message, and sends the three-layer multicast table and the user multicast table to the forwarding plane, and continues to step (4);
(4) the forwarding plane generates a multicast forwarding table and sends the multicast forwarding table to hardware equipment, and the hardware equipment performs replication forwarding according to the multicast forwarding table.
Preferably, the step (4) of generating a multicast forwarding table by the forwarding plane and issuing the multicast forwarding table to the hardware device specifically includes:
after detecting that the forwarding plane has the three-layer multicast table, the forwarding plane generates a multicast forwarding table according to the received user multicast table and the three-layer multicast table and sends the multicast forwarding table to the hardware equipment.
Preferably, the control plane generates the user multicast table according to the IGMP content of the multicast packet received by the control plane.
The system and the method for realizing the accelerated multicast replication in the NFV are used for the latest scenes of SDN, NFV and the like, solve the problem of user multicast messages under the condition of soft forwarding, sink the multicast messages needing software replication to hardware equipment through matching with the hardware equipment, and transfer the multicast messages to the hardware equipment for replication, thereby not only greatly improving the forwarding performance, but also avoiding the influence on unicast messages, improving the multicast efficiency, releasing CPU (Central processing Unit) resources and indirectly improving the efficiency of other services.
Drawings
Fig. 1 is a schematic diagram of multicast replication in the case of using a multicast function in the prior art.
Fig. 2 is a schematic diagram of multicast replication of a system for implementing accelerated multicast replication in NFV according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The system for realizing the accelerated multicast replication in the NFV comprises hardware equipment, a forwarding plane and a control plane which are sequentially connected, wherein the hardware equipment is used for receiving and replicating multicast messages and forwarding the multicast messages according to a multicast forwarding table; the forwarding plane is used for generating a multicast forwarding table, issuing the multicast forwarding table to the hardware equipment, and sending the multicast message received by the hardware equipment to the control plane; the control plane is used for generating a user multicast table and a three-layer multicast table according to the multicast messages and sending the user multicast table to the forwarding plane.
In a preferred embodiment, the forwarding plane generates the multicast forwarding table according to the user multicast table and the three-layer group table after querying that the forwarding plane has the three-layer multicast table.
In a preferred embodiment, the control plane generates the user multicast table according to the content of the IGMP in the multicast message.
In a preferred embodiment, the hardware device comprises a P4 switch.
The method for realizing the accelerated multicast replication in the NFV based on the system comprises the following steps:
(1) after receiving the multicast message, the hardware equipment checks whether a multicast forwarding table exists, and if so, the hardware equipment performs copy forwarding according to the existing multicast forwarding table; if not, continuing the step (2);
(2) the hardware device sends the received multicast message to the forwarding plane, the forwarding plane inquires whether a three-layer multicast table exists, if so, the step (4) is continued; if not, continuing the step (3);
(3) the forwarding plane sends the multicast message to the control plane, the control plane generates a three-layer multicast table and a user multicast table according to the received multicast message, and sends the user multicast table and the three-layer multicast table to the forwarding plane, and the step (4) is continued;
(4) the forwarding plane generates a multicast forwarding table and sends the multicast forwarding table to the hardware equipment, and the multicast forwarding table is copied and forwarded according to the multicast forwarding table.
In a preferred embodiment, the step (4) of generating, by the forwarding plane, a multicast forwarding table and issuing the multicast forwarding table to the hardware device specifically includes:
after detecting that the forwarding plane has the three-layer multicast table, the forwarding plane generates a multicast forwarding table according to the received user multicast table and the three-layer multicast table and sends the multicast forwarding table to the hardware equipment.
In a preferred embodiment, the control plane generates the user multicast table according to the IGMP content of the multicast packet received by the control plane.
Referring to fig. 2, forwarding of multicast is performed by a newly added hardware device, and due to the flexibility of the hardware device, the device needs to send a fixed configuration to the hardware device.
When the hardware equipment receives the multicast message for the first time, because the hardware equipment does not have any table entry, the hardware equipment sends the received multicast message to a forwarding plane, and then the multicast message is sent to a control plane by the forwarding plane, the control plane generates one or more table entries (user multicast table) according to the state of the multicast route and sends the table entries to the forwarding plane, and the forwarding plane generates a series of control commands (multicast forwarding table) according to the state of the forwarding plane and the type of the hardware equipment and sends the control commands (multicast forwarding table) to the hardware equipment by a channel. Therefore, when the hardware equipment receives the multicast message again, the configuration is available, the hardware equipment receiving the multicast message performs time-consuming operations such as copying and encapsulating the message header on the multicast message according to the configuration, and finally forwards the message to a required user, so that the multicast efficiency is greatly improved, the CPU resource is released, and the efficiency of other services is indirectly improved.
In a specific embodiment, a P4 switch is used as a hardware device in the system, and the method for implementing multicast replication acceleration in NFV in the system includes the following steps:
(1) the user sends a group adding message, and specifies a multicast message with a required destination address of 225.1.1.1.
(2) After the P4 switch receives the message, it finds that it is an IGMP (Internet group management protocol) message and sends it to the forwarding plane.
(3) The forwarding plane sends the message to the control plane.
(4) And the control plane generates a user multicast table according to the content of the IGMP of the message and sends the user multicast table to the forwarding plane.
(5) The forwarding plane stores the user multicast list, inquires the three-layer multicast list, finds that no three-layer multicast list exists, and stops the action.
(6) The multicast source sends 225.1.1.1 multicast message to P4 switch.
(7) The P4 exchanger checks the table, finds no table item and sends the multicast message.
(8) Forwarding the plane table lookup, finding that no three-layer multicast table exists, and uploading the multicast message.
(9) The control plane receives the multicast message, generates a three-layer multicast table according to the protocol and the state machine, and sends the three-layer multicast table to the forwarding plane.
(10) The forwarding plane stores the three-layer multicast table, queries the user multicast table, finds out matching information, generates a multicast forwarding table, generates configuration related to P4, and issues the configuration to P4.
(11) After receiving 225.1.1.1 multicast message again, P4 checks the table, finds the table entry (multicast forwarding table), copies the table entry, and sends the table entry to the desired user.
The used table entries in the multicast process are 3, which are respectively a three-layer multicast table, a user multicast table and a multicast forwarding table. Wherein, the multicast forwarding table is generated by a three-layer multicast table and a user multicast table according to logic. When only the user multicast table exists, the logic for generating the multicast forwarding table is not satisfied, so that the forwarding plane does not issue the multicast forwarding table to the hardware equipment, and only when the three-layer multicast table is generated, the forwarding platform can judge whether the multicast forwarding table is generated again. In a specific embodiment, the multicast forwarding table issued by the forwarding plane is further converted into a multicast forwarding table that can be identified by the hardware device, and is definitely a command that can be identified by the hardware device and is set according to the type of the hardware device.
The system and the method for realizing the accelerated multicast replication in the NFV are used for the latest scenes of SDN, NFV and the like, solve the problem of user multicast messages under the condition of soft forwarding, sink the multicast messages needing software replication to hardware equipment through matching with the hardware equipment, and transfer the multicast messages to the hardware equipment for replication, thereby not only greatly improving the forwarding performance, but also avoiding the influence on unicast messages, improving the multicast efficiency, releasing CPU (Central processing Unit) resources and indirectly improving the efficiency of other services.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (7)
1. A system for realizing acceleration of multicast replication in NFV is characterized in that the system comprises hardware equipment, a forwarding plane and a control plane which are connected in sequence, wherein,
the hardware equipment is used for receiving and copying the multicast message and forwarding the multicast message according to the multicast forwarding table;
the forwarding plane is used for generating a multicast forwarding table, issuing the multicast forwarding table to the hardware equipment, and sending the multicast message received by the hardware equipment to the control plane;
the control plane is used for generating a three-layer multicast table and a user multicast table according to the multicast message and sending the three-layer multicast table and the user multicast table to the forwarding plane;
the hardware equipment sends the received multicast message to a forwarding plane under the condition of receiving the multicast message for the first time, then the multicast message is sent to a control plane by the forwarding plane, the control plane generates a user multicast table according to the state of the multicast route and sends the user multicast table to the forwarding plane, and the forwarding plane generates a multicast forwarding table according to a three-layer multicast table and the user multicast table and sends the multicast forwarding table to the hardware equipment;
the hardware equipment receives the multicast message, copies and encapsulates the multicast message header according to the configuration, and forwards the message to a target user.
2. The system according to claim 1, wherein the forwarding plane generates the multicast forwarding table according to the triple-layer multicast table and the user multicast table after querying that the forwarding plane has the triple-layer multicast table.
3. The system according to claim 1, wherein the control plane generates a user multicast table according to IGMP content of the multicast packet.
4. The system according to claim 1, wherein said hardware device comprises a P4 switch.
5. A method for implementing multicast replication acceleration in NFV based on the system of any of claims 1 to 4, wherein the method comprises the following steps:
(1) after receiving the multicast message, the hardware equipment checks whether a multicast forwarding table exists, and if so, the hardware equipment performs copy forwarding according to the existing multicast forwarding table; if not, continuing the step (2);
(2) the hardware device sends the received multicast message to the forwarding plane, and inquires whether a three-layer multicast list exists on the forwarding plane, if so, the step (4) is continued; if not, continuing the step (3);
(3) the forwarding plane sends the multicast message to the control plane, the control plane generates a three-layer multicast table and a user multicast table according to the received multicast message, and sends the three-layer multicast table and the user multicast table to the forwarding plane, and continues to step (4);
(4) the forwarding plane generates a multicast forwarding table and sends the multicast forwarding table to hardware equipment, and the hardware equipment performs replication forwarding according to the multicast forwarding table.
6. The method according to claim 5, wherein the step (4) of generating a multicast forwarding table by the forwarding plane and sending the multicast forwarding table to the hardware device specifically comprises:
after detecting that the forwarding plane has the three-layer multicast table, the forwarding plane generates a multicast forwarding table according to the received user multicast table and the three-layer multicast table and sends the multicast forwarding table to the hardware equipment.
7. The method according to claim 5, wherein the control plane generates the user multicast table according to IGMP content of the received multicast packet.
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| CN114301823B (en) * | 2021-12-29 | 2024-01-02 | 中国电信股份有限公司 | Route notification method, device, equipment and storage medium |
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| JP3925188B2 (en) * | 2001-12-20 | 2007-06-06 | 日本電気株式会社 | Application layer multicast method and relay node system |
| CN101771611B (en) * | 2009-12-31 | 2012-12-19 | 迈普通信技术股份有限公司 | Method for precisely forwarding IP multicast data in VLAN and forward device |
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| CN101557342A (en) * | 2009-05-18 | 2009-10-14 | 杭州华三通信技术有限公司 | Forwarding method of multicast messages and router |
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| CN103873373A (en) * | 2012-12-11 | 2014-06-18 | 杭州华三通信技术有限公司 | Multicast data message forwarding method and equipment |
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