WO2012103704A1 - Procédé, dispositif et système de duplication de diffusion groupée - Google Patents

Procédé, dispositif et système de duplication de diffusion groupée Download PDF

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Publication number
WO2012103704A1
WO2012103704A1 PCT/CN2011/076263 CN2011076263W WO2012103704A1 WO 2012103704 A1 WO2012103704 A1 WO 2012103704A1 CN 2011076263 W CN2011076263 W CN 2011076263W WO 2012103704 A1 WO2012103704 A1 WO 2012103704A1
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WIPO (PCT)
Prior art keywords
multicast
traffic manager
egress
packet
port
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PCT/CN2011/076263
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English (en)
Chinese (zh)
Inventor
王亮
张健
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/076263 priority Critical patent/WO2012103704A1/fr
Priority to CN201180001021.XA priority patent/CN103222230B/zh
Publication of WO2012103704A1 publication Critical patent/WO2012103704A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1881—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with schedule organisation, e.g. priority, sequence management

Definitions

  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to a multicast replication method, apparatus, and system. Background technique
  • Multicast is a traffic model that copies an upstream packet into multiple copies and distributes it to multiple downstream ports.
  • network applications such as HDTV
  • multicast technology has become more and more widely used, and multicast performance has become one of the important performance indicators of large-scale network devices such as routers and switches.
  • the architecture of a large-scale forwarding system usually consists of multiple Line Cards and a large-capacity switching network.
  • the Packet Processing and Forwarding Engine (PFE) on the line card is responsible for packet parsing and forwarding, and the switching network performs switching.
  • the PFE is usually decomposed into two modules: the packet processor (PP) and the traffic manager (TM), where the PP is responsible for packet processing and determining forwarding rules, and the TM is responsible for forwarding, replication, and quality of service (QoS). ) Guaranteed and other functions.
  • the complete process of multicast packets usually includes: multicast ingress port->uplink ⁇ -> ⁇ # ⁇ ->switched network->downlink ⁇ ->downstream ⁇ ->multicast outgoing port, where uplink refers to packet
  • uplink refers to packet
  • the data is transmitted from the data interface to the switching network.
  • the downlink refers to the transmission of packets from the switching network to the data interface.
  • the performance of multicast replication depends mainly on the implementation and performance of the switching network.
  • FIG. 1 is a schematic flowchart of a first multicast replication method in the prior art
  • FIG. 2 is a schematic flowchart of a second multicast replication method in the prior art
  • FIG. 3 is a third multicast in the prior art.
  • a multicast replication method in the prior art is uplink replication, that is, all replication work is completed in the uplink module of the multicast source, and multiple multicast packets are copied. The text enters the uplink queue separately and is forwarded through the switching network.
  • the multicast module for the multicast source is configured to replicate multicast packets for multiple egress ports.
  • the packet can enter the unicast queue according to the priority carried.
  • the QoS guarantee can be provided by scheduling the multicast packets in the uplink queue according to the congestion status of the egress port and the priority of the packets.
  • the bandwidth consumption of the TM to the switching network is severe.
  • 10G multicast source traffic when there are 4 multicast members on other line cards, will generate 40G switching network line bandwidth requirements.
  • FIG. 2 another multicast replication method in the prior art is a switching network replication solution, where: the switching network first copies the multicast packet received from the input side line card to the downlink of the multicast member.
  • the TM module further copies the multicast packets forwarded by the switching network to all member ports by the downlink TM module.
  • the multicast packets are not formed in the uplink TM module and the switching network where the multicast source resides.
  • the broadcast packet is scheduled, and the multicast packet is forwarded by the multicast member to the multicast network.
  • the multicast packet is copied to all member ports. Cache and scheduling.
  • the upstream multicast source sends packets to the switching network, it is not subject to the scheduling control of a certain downlink port. Therefore, the outbound port can not schedule the multicast packets in the uplink queue. Provide QoS guarantees. As shown in FIG.
  • another multicast replication method in the prior art is a cyclic tree replication scheme, that is, the uplink TM module in which the multicast source is located uses a binary tree-like manner to copy the packet and send it to the switch network.
  • the downlink module of the intermediate node wherein the downlink module as the intermediate node is not the downlink TM module where the member port of the multicast packet is located, and the downlink TM module as the intermediate node performs the secondary binary tree replication of the packet. If the number of multicast packets is the same as the number of member ports, the number of the multicast packets is the same as that of the member ports.
  • the copied packet is sent to the next intermediate node through the switching network for replication until it is copied to all member ports through a series of loops.
  • This method for multicast replication if there are many member ports, you need to use multiple times.
  • the intermediate node is selected as the replication agent, and one traffic passes through the switching network multiple times, which seriously consumes the bandwidth of the switching network. It can be seen that the prior art multicast replication method cannot provide QoS guarantee while effectively saving the bandwidth of the switching network. Summary of the invention
  • the purpose of the embodiments of the present invention is to provide a multicast replication method, apparatus, and system for providing QoS guarantee under the condition that the bandwidth of the switching network is effectively saved.
  • the embodiment of the invention provides a multicast replication method, including:
  • the downlink module of the egress traffic manager receives the multicast packet sent by the switching network through the recurring port, and sends the multicast packet to the uplink module, where the egress traffic manager includes the uplink module and the downlink module. And a physical port for communicating with the outside, the downlink module is provided with the cyclic port;
  • the egress module of the egress traffic manager searches for the multicast member port corresponding to the multicast packet in the first uplink multicast replication table according to the group identifier carried in the multicast packet;
  • the uplink module of the egress traffic manager calculates the number of multicast member ports of the multicast member port corresponding to the egress packet, and according to the egress traffic manager The number of multicast member ports included in the physical port is copied to the multicast packet, so that the number of the copied multicast packets and the multicast member included in the physical port of the egress traffic manager are The number of ports is the same;
  • the uplink module of the egress traffic manager adds the copied multicast packet to the unicast packet buffer queue according to the priority, and then sends the packet to the downlink module through the local forwarding channel according to the QoS setting of the multicast member port. And the downlink module sends the duplicated multicast packet to the multicast member port included in the physical port of the egress traffic manager.
  • an embodiment of the present invention further provides an egress traffic manager, including an uplink module, a downlink module, and a physical port for communicating with the outside, where the downlink module is configured with a loop port, where: The downlink module is configured to receive the multicast packet sent by the switching network by using the cyclic port, and send the multicast packet to the uplink module.
  • an egress traffic manager including an uplink module, a downlink module, and a physical port for communicating with the outside, where the downlink module is configured with a loop port, where: The downlink module is configured to receive the multicast packet sent by the switching network by using the cyclic port, and send the multicast packet to the uplink module.
  • the uplink module is configured to search for a multicast member port corresponding to the multicast packet in the first uplink multicast replication table according to the group identifier carried in the multicast packet, and calculate the multicast packet corresponding to the multicast packet.
  • the number of multicast member ports belonging to the physical port of the egress traffic manager in the multicast member port, and the multicast report according to the number of multicast member ports included in the physical port of the egress traffic manager The file is copied, so that the number of the multicast packets after the replication is the same as the number of the multicast member ports included in the physical port of the egress traffic manager;
  • the unicast packet cache queue is added to the unicast packet buffer queue and sent to the downlink module through the local forwarding channel after being scheduled according to the multicast member port QoS.
  • the downlink module is further configured to send the copied multicast "3" message to the multicast member port included in the physical port of the egress traffic manager.
  • an embodiment of the present invention further provides a multicast replication system, including an egress traffic manager, an ingress traffic manager, and an egress traffic manager connected to the The switching network between the ingress traffic managers.
  • the multicast packet is looped back to itself through the loop port set by itself.
  • the uplink module in the uplink module of the egress traffic manager, implements multicast packet replication for the multicast member port, and the copied multicast packet enters the unicast packet buffer queue according to the priority, according to the multicast member.
  • the port QoS is scheduled, it is sent to the downlink module through the local forwarding channel, and is sent out by the downstream module through the multicast member port included in the egress traffic manager. Therefore, the multicast member port QoS can be scheduled, which can be effectively implemented. Provide QoS guarantees under the condition of saving the bandwidth of the switching network.
  • FIG. 1 is a schematic flowchart of a first multicast replication method in the prior art
  • FIG. 2 is a schematic flowchart of a second multicast replication method in the prior art
  • FIG. 3 is a schematic flowchart of a third multicast replication method in the prior art
  • FIG. 4 is a flowchart of a multicast replication method according to a first embodiment of the present invention.
  • FIG. 5 is a system architecture diagram of a multicast replication method to which a first embodiment of the present invention is applied;
  • FIG. 6 is a schematic view showing the structure of an outlet TM according to a second embodiment of the present invention. detailed description
  • FIG. 4 is a flowchart of a multicast copying method according to a first embodiment of the present invention. As shown in Figure 4, the multicast replication method includes the following steps:
  • Step S101 The downlink module of the egress TM receives the multicast packet sent by the switching network through the cyclic port, and sends the multicast packet to the uplink module.
  • the egress TM includes an uplink module, a downlink module, and a physical port for communicating with the external, the cyclic port is set on the downlink module, and the cyclic port passes the internal loopback channel and the uplink module disposed between the cyclic port and the uplink module.
  • the loop port When the loop port is used as the communication interface between the egress TM and the switching network, after receiving the multicast message from the switching network, the loop port directly sends the received multicast packet from the downlink module to the upper loop through the internal loopback channel.
  • Line module The uplink module stores the received packets in different address spaces in order according to the difference between the destination port and the priority.
  • Step S102 After receiving the multicast packet, the uplink module of the egress TM searches for the multicast packet in the first uplink multicast replication table according to the group identifier carried in the multicast packet.
  • a multicast member port where the first uplink multicast replication table stores a group identifier of the multicast packet and a multicast member port corresponding to the group identifier, and the format of the uplink multicast replication table is, for example, Table 1;
  • Step S103 the uplink module of the egress TM calculates the number of multicast member ports of the multicast member port corresponding to the egress traffic manager in the multicast member port corresponding to the multicast packet, and according to the egress traffic manager The number of multicast member ports included in the physical port is copied to the multicast packet, so that the number of the copied multicast packets and the multicast member port included in the physical port of the egress TM are The same number;
  • Step S104 the egress ME adds the copied multicast packet to the unicast packet buffer queue according to the priority, and then sends the packet to the downlink module through the local forwarding channel according to the QoS setting of the multicast member port.
  • the downlink module sends the copied multicast packet to the multicast member port included in the physical port of the egress traffic manager.
  • the local forwarding channel is set between the upstream module and the downlink module of the egress TM, and the to-be-sent packet buffered by the egress module is forwarded to the downlink module through the local forwarding channel.
  • FIG. 5 is a system architecture diagram of a multicast replication method to which the first embodiment of the present invention is applied.
  • the system includes a plurality of line cards and a switching network, wherein each line card can include one or more TMs.
  • Each The line card also includes a network processor (not shown in Figure 5), and the line card is connected to the switching network.
  • TM is a data frame that restores a physical signal on a transmission line (eg, fiber, cable, or wireless channel, etc.) to an agreed format for further processing by the network processor, or completes a reverse process, ie, the data is processed by the network processor The frame is processed, and the processed data frame is converted by the TM into a physical signal on the transmission line and transmitted to the transmission line.
  • the network processor For the multicast packet, the network processor identifies the source information, the destination information, and the preference information of the multicast packet according to the agreed format, and then modifies the packet format according to the current forwarding rule, sends the packet format to the TM, and obtains the multicast from the network processor.
  • the packet sent by the multicast packet to the multicast member port is the entry TM of the multicast packet, and the TM of the multicast member port of the multicast packet is the multicast packet.
  • Text ExportTM The multicast copying method of the first embodiment of the present invention described above is described from the perspective of the ExitTM.
  • TM-4 is an exit TM of the multicast message shown in FIG. 5, and the multicast copy method of the first embodiment of the present invention will be described below by taking the TM-4 shown in FIG. 5 as an example.
  • the TM-4 receives the multicast packet from the switching network through its own cyclic port C, and the cyclic port C directly loops the received multicast packet back to the uplink module of the TM-4 via the internal loopback channel.
  • the uplink module of the TM-4 queries the entry corresponding to the group ID in the uplink multicast replication table according to the group identifier (group ID) carried in the header of the multicast packet, specifically, corresponding to the group ID.
  • the entries include all multicast member ports corresponding to the multicast message.
  • the uplink module of the TM-4 filters out the multicast member ports included in the TM-4 from all the multicast member ports corresponding to the multicast packet, and according to the number of multicast member ports included in the TM-4.
  • the number of copies to be added is "the number of multicast member ports included in the TM-4 minus 1", that is, the number of duplicated multicast packets and the TM-4 are ensured.
  • the number of multicast member ports is the same.
  • TM-4 can query the uplink multicast replication table of the device to learn that all multicast member ports of the multicast packets are four, and two of them are the ports of the TM-4. At this time, the TM-4 only needs to copy one multicast packet to obtain two multicast packets corresponding to two ports.
  • the packet sent by the uplink module of the TM is the switching network. Therefore, after the uplink module of the TM-4 completes the replication of the local multicast member port, it needs to be copied through the local forwarding channel.
  • the multicast packet is forwarded to the local downlink module, and the multicast packet is sent to the network processor through the multicast member port included in the TM-4 in the manner that one multicast packet corresponds to one port. That is, the downlink module stores the multicast packet in the cache of the local multicast member port and sends it to the network processor for further processing to the network processor.
  • the egress TM directly loops back to the local uplink module through the internal loop port, and implements the replication of the multicast message in the TM.
  • the local forwarding channel forwards the copied multicast "3" to the downstream module of the egress TM.
  • the copied multicast packet is queued to the normal unicast queue according to the priority, and the unicast packet is shared. Scheduling, accepting the unified scheduling of the downlink port, its QoS performance can be fully guaranteed; on the other hand, because the loopback and replication of the packet are implemented in the same TM, the multicast packet is only used by the downstream port.
  • the bandwidth of the internal loopback channel is occupied in the process of returning to the uplink module, and the bandwidth of the local forwarding channel is occupied by the uplink module in the process of forwarding the copied multicast packet from the uplink module to the downlink module, without consuming the bandwidth of the switching network.
  • the switching network forwards the bandwidth, which effectively saves the bandwidth of the switching network, thereby improving the replication efficiency.
  • the method before the egress TM receives the multicast packet sent by the switching network through the re-circulation port, the method further includes:
  • the ingress TM receives the multicast packet sent by the network processor, and searches for the egress TM corresponding to the multicast packet in the second uplink multicast replication table according to the group identifier carried in the multicast packet, where the second uplink group
  • the group identifier of the multicast packet stored in the broadcast replication table and the identifier of the exit TM corresponding to the group identifier are only used;
  • the ingress TM copies the multicast packet, so that the number of the copied multicast packets is the same as the number of the egress TMs;
  • the ingress TM sends the multicast message to the egress TM through the switching network.
  • the egress TM completes the multicast replication for the local multicast member port in the chip, where the ingress TM completes the different TM for the multicast member port.
  • TM-0 is the entry of the multicast message shown in Figure 5.
  • the TM, TM-0 after receiving the multicast packet from the network processor, searches the local uplink multicast replication table according to the group ID carried in the multicast packet to learn the egress TM corresponding to the multicast packet. Taking the situation shown in Figure 5 as an example, the egress TM corresponding to the multicast packet includes TM-4 and TM-3. At this time, TM-0 needs to copy the multicast and subtext once (not shown in Figure 5). Shown) to obtain two multicast messages that can be sent to ⁇ -4 and ⁇ -3 via the switching network, respectively.
  • the method before the egress port receives the multicast packet sent by the switching network through the re-circulation port, the method further includes:
  • the switching network receives the multicast packet sent by the ingress port, and searches for the egress packet corresponding to the multicast packet in the multicast replication table according to the group ID carried in the multicast packet, where the multicast replication table stores the a group identifier of the multicast packet and an identifier of the exit TM corresponding to the group identifier;
  • the switching network replicates the multicast packets so that the number of replicated multicast packets is the same as the number of egress TMs.
  • the switching network sends a multicast message to the egress TM, that is, sends a multicast message to each egress TM.
  • the egress TM completes the multicast packet replication for the local multicast member port in the chip, where the switching network completes different TMs for the multicast member port.
  • TM-0 is the ingress TM of the multicast packet shown in FIG. 5, that is, after the switching network receives the multicast packet from the TM-0, the switching network searches for the locally stored multicast replication table according to the group ID carried in the multicast packet. To know the egress TM corresponding to the multicast packet. As shown in Figure 5, the egress TM corresponding to the multicast packet includes TM-4 and TM-3. In this case, the switching network needs to copy the multicast packet (as shown in Figure 5). Show), to obtain two multicast messages that can be sent to ⁇ -4 and ⁇ -3 respectively.
  • the multicast packet sent to the uplink module carries an identifier for identifying a cyclic port of the multicast packet from the egress TM.
  • the egress TM configures an identifier for the multicast packet before the multicast packet is sent to the uplink module, so that the multicast packet can be It is different from the multicast packet received from the external network processor when the egress TM is used as the ingress traffic manager of other multicast packets. That is, after the uplink module of the egress TM detects that the received multicast packet carries the identifier of the re-circulating port for identifying the multicast packet from the egress TM, step S102 to step S104 in the above embodiment are executed.
  • FIG. 6 is a schematic view showing the structure of an outlet TM according to a second embodiment of the present invention.
  • the egress TM includes an uplink module 202 and a downlink module 201.
  • the egress TM further includes a physical port (not shown) for communicating with the outside, and the downlink module is provided with a cyclic port, wherein
  • the downlink module 201 is configured to receive the multicast packet sent by the switching network through the cyclic port, and send the multicast packet to the uplink module 202;
  • the uplink module 202 is configured to search for a multicast member port corresponding to the multicast packet in the first uplink multicast replication table according to the group identifier carried in the multicast packet, and calculate a corresponding corresponding to the multicast packet.
  • the downlink module 201 is further configured to send the copied multicast text to the multicast member port included in the physical port of the egress traffic manager.
  • the process of performing the multicast replication in the egress TM of the foregoing embodiment is the same as the multicast replication method in the first embodiment of the present invention, and therefore is not described herein again.
  • the downlink module after receiving the multicast packet, the downlink module directly loops back to the uplink module through the internal loop port, and the uplink module searches for the uplink multicast replication table to implement in the uplink module of the TM.
  • the multicast packet is copied, and the copied multicast packet is forwarded to the downlink module of the local TM through the local forwarding channel.
  • the copied multicast packet enters the unicast packet buffer queue according to the priority.
  • the hop scheduling is shared with the unicast packet, and the unicast scheduling of the downlink port is accepted.
  • the QoS performance of the downlink port can be fully guaranteed.
  • the loopback and replication of the packet are implemented in the same TM.
  • the process of occupying the bandwidth of the internal loopback channel and occupying the bandwidth of the local forwarding channel during the process of forwarding the copied multicast packet from the upstream to the downlink does not consume the bandwidth of the switching network and the forwarding bandwidth of the switching network, thereby effectively saving the bandwidth. Switch network bandwidth, which improves replication efficiency.
  • the downlink module is further configured to add, in the multicast packet sent to the uplink module, an identifier for identifying the cyclic port of the multicast packet from the egress traffic manager.
  • the downlink module configures an identifier for the multicast packet before the multicast packet is sent to the uplink module, so that the multicast packet can be It is different from the multicast message received by the external network processor when the egress TM is used as the ingress traffic manager of other multicast messages. That is, the uplink module performs the corresponding operation if it detects that the received multicast packet carries an identifier for identifying the multicast packet from the egress port of the egress port. With this arrangement, the egress TM can be used as an entry point for other multicast messages.
  • a third embodiment of the present invention provides a multicast replication system including an egress TM, an entry TM, and a switching network connected between the egress TM and the portal TM provided by the second embodiment of the present invention.
  • the chip-level multicast packet replication for different egress packets corresponding to the multicast packet is completed by the ingress TM, and the copied packet is sent to each egress TM through the switching network. And then the TM completes the port for the multicast member port corresponding to the multicast message.
  • the multicast packets are transmitted and sent out through the local multicast member port.
  • the multicast packets are sent from the external network processor to the switching network.
  • the multicast packets are sent to the switching network.
  • the chip-level multicast packets of the different egress TMs are copied, and the copied packets are respectively sent to the egress TMs, and the TM completes the port-level group for the multicast member ports corresponding to the multicast packets.
  • the broadcast message is copied and sent out via the local multicast member port.
  • the chip-level multicast copy of the different egress TM corresponding to the multicast message is completed by the switching network.
  • the multicast packet copied by the egress TM can be queued to the common unicast queue, and the unicast packet is shared with the queue scheduling, and the unified scheduling of the downlink port is accepted, and the Qos performance is obtained.
  • the internal loopback channel bandwidth is occupied only during the downlink loopback to the uplink queue, and During the process of forwarding the copied multicast packet from the upstream to the downlink, the bandwidth of the local forwarding channel is occupied without consuming the bandwidth of the switching network and the forwarding bandwidth of the switching network.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

Les modes de réalisation de l'invention portent sur un procédé, un dispositif et un système de duplication de diffusion groupée. Le procédé comprend les opérations suivantes : le module de liaison descendante d'un gestionnaire de trafic (TM) de sortie reçoit, par un port d'anneau, un message de diffusion groupée envoyé par un réseau commuté, et l'envoie au module de liaison montante; le module de liaison montante du TM de sortie recherche les ports membres de diffusion groupée correspondants conformément à l'identificateur de groupe contenu dans le message de diffusion groupée; le module de liaison montante duplique le message de diffusion groupée conformément au nombre des ports membres de diffusion groupée compris dans le TM de sortie, ajoute les messages de diffusion groupée dupliqués à la file d'attente de mise en tampon de message d'envoi individuel conformément à la priorité, et les envoie au module de liaison descendante par un canal d'acheminement local après configuration du planificateur conformément à la qualité de service (QoS) des ports membres de diffusion groupée, afin d'amener les messages de diffusion groupée dupliqués à être envoyés. Le procédé, le dispositif et le système de duplication de diffusion groupée des modes de réalisation de l'invention peuvent réaliser l'assurance d'une garantie de QoS dans la situation d'économie efficace de la bande passante du réseau commuté, et peuvent en outre améliorer le taux d'utilisation de bande passante du réseau commuté lorsque le réseau commuté effectue une duplication de message de diffusion groupée pour différents TM de sortie.
PCT/CN2011/076263 2011-06-24 2011-06-24 Procédé, dispositif et système de duplication de diffusion groupée WO2012103704A1 (fr)

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CN101123529A (zh) * 2007-09-21 2008-02-13 杭州华三通信技术有限公司 基于pcie交换网的组播实现方法、系统及设备
CN101262436A (zh) * 2008-04-08 2008-09-10 华为技术有限公司 组播复制方法、装置及线卡

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WO2019228433A1 (fr) * 2018-05-31 2019-12-05 新华三技术有限公司 Procédé et dispositif de réacheminement de message de données de multidiffusion
CN109302349A (zh) * 2018-09-29 2019-02-01 迈普通信技术股份有限公司 一种报文转发方法及路由设备

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