WO2019228433A1 - 组播数据报文转发方法及设备 - Google Patents

组播数据报文转发方法及设备 Download PDF

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Publication number
WO2019228433A1
WO2019228433A1 PCT/CN2019/089197 CN2019089197W WO2019228433A1 WO 2019228433 A1 WO2019228433 A1 WO 2019228433A1 CN 2019089197 W CN2019089197 W CN 2019089197W WO 2019228433 A1 WO2019228433 A1 WO 2019228433A1
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forwarded
replication group
multicast data
replication
data message
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PCT/CN2019/089197
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English (en)
French (fr)
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王明辉
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新华三技术有限公司
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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
    • 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
    • H04L45/74—Address processing for routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric

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  • the switch needs to copy the received high-volume multicast data packets, such as video-on-demand data packets and voice data packets, and then send them to different other devices.
  • the forwarding of large-scale multicast data packets consumes a lot of bandwidth resources of the switch device.
  • the switch receives the multicast data packet from the multicast source through the aggregation port, and then sends the multicast data broadcast packet through the aggregation port which is a member port of the multicast group.
  • FIG. 1 is a schematic diagram of a multicast data message forwarding method provided by the present disclosure
  • FIG. 2 is a schematic diagram of a switch forwarding multicast data packets according to an example of the present disclosure
  • FIG. 3 shows the forwarding of multicast data messages in the switch in FIG. 2;
  • FIG. 4 illustrates a setting process of a replication group of the switch in FIG. 2;
  • FIG. 5 is a schematic diagram of a switch forwarding multicast data packets according to another example of the present disclosure.
  • FIG. 6 shows the forwarding of multicast data messages in the switch in FIG. 5.
  • the multicast data packet forwarding method provided by the present disclosure includes the following processing:
  • Process 111 Identify the to-be-replicated replication group associated with the receiving member port of the multicast data message to be forwarded.
  • the replication group to be forwarded includes more than one outgoing member port of each outbound aggregation port of the multicast group to which the multicast packet to be forwarded belongs, and all the outgoing member ports of the replication group to be forwarded are located on different chips.
  • Process 112 Redirect the multicast data message to be forwarded to the replication group to be forwarded.
  • Process 113 Send a duplicate multicast data packet to the physical chip where each outgoing member port of the replication group to be forwarded is located.
  • Process 114 Send a duplicate multicast data packet through each outgoing member port of the replication group to be forwarded.
  • the multicast data message forwarding method shown in FIG. 1 sends a multicast data message to the chip where the port that forwards the multicast data message is transmitted, which avoids sending the to-be-forwarded data to other forwarding chips that do not need to forward multicast data messages. Bandwidth occupied by data packets.
  • FIG. 2 is a schematic diagram of forwarding a multicast data packet by the switch 100 provided in this embodiment.
  • the aggregated port 210 of the switch 100 is located on a path connected to the multicast source 200 and is an incoming aggregation port of a multicast group. Multiple member ports of the incoming aggregation port 210 are incoming member ports.
  • the aggregation ports 310, 320, 330, and 340 of the switch 100 are respectively located on the paths connecting the devices 301, 302, 303, and 304 of each member of the multicast group, and are the exit aggregation ports of the multicast group; Multiple member ports are outgoing member ports.
  • the incoming member ports of the incoming aggregation port 210 are the ports 10.1 to 10.6 of the forwarding chip 10 and the ports 11.1 to 11.6 of the forwarding chip 11 on the interface board 20.
  • the outgoing member ports of the outgoing aggregation port 310 are the ports 12.1 to 12.6 of the forwarding chip 12 on the interface board 21 and the ports 13.1 to 13.6 of the forwarding chip 13.
  • the outgoing member ports of the outgoing aggregation port 320 are the ports 14.1 to 14.6 of the forwarding chip 14 and the ports 15.1 to 15.6 of the forwarding chip 15 on the interface board 21.
  • the outgoing member ports of the outgoing aggregation port 330 are the ports 16.1 to 16.6 of the forwarding chip 16 and the ports 17.1 to 17.6 of the forwarding chip 17 on the interface board 22.
  • the outgoing member ports of the outgoing aggregation port 340 are the ports 18.1 to 18.6 of the forwarding chip 18 on the interface board 22 and the ports 19.1 to 19.6 of the forwarding chip 19.
  • FIG. 4 illustrates a process of setting a replication group provided by the present disclosure:
  • Process 410 Set multiple replication groups based on the number of ingress members of the ingress port of the multicast group of the multicast data message to be forwarded.
  • the main control board (not shown in FIG. 2) of the switch 100 sets 12 replication groups based on the number of ingress member ports of the ingress aggregation port 210 of the multicast group.
  • Process 420 Allocate more than one egress member port of each outbound aggregation port of the multicast group located on different physical chips to each replication group.
  • the multiple exit member ports of the exit aggregation port 310 are located on two different switching chips of the switching chip 12 and the switching chip 13.
  • a member group is selected from each outbound aggregation port of the multicast group to form a replication group.
  • the main control board of the switch 100 respectively assigns one outgoing member port of the outgoing aggregation ports 310, 320, 330, and 340 to each replication group configured, so that each set of the replication group includes each outgoing aggregation port 310, 320 , 330, 340, one outlet member, and all the outlet members of each set of the replication group are located on different physical chips.
  • the output member port of the first replication group assigned by the main control board of switch 100 includes the outgoing member ports 12.1, 14.1, 16.1, 18.1;
  • the outgoing member port assigned to the second replication group set includes the outgoing member port 12.2, 14.2, 16.2, 18.2;
  • the outgoing member ports assigned to the third replication group include outgoing member ports 12.3, 14.3, 16.3, 18.3.
  • the outgoing member ports assigned to the set 4th replication group include outgoing member ports 12.4, 14.4, 16.4, 18.4; the outgoing member ports assigned to the 5th replication group include outgoing member ports 12.5, 14.5, 16.5, 18.5; switch 100
  • the main control board of the 6th replication group assigned to the outgoing member port includes the outgoing member ports 12.6, 14.6, 16.6, 18.6; the outgoing member port assigned to the 7th replication group includes the outgoing member ports 13.1, 15.1, 17.1, 19.1; Outgoing member ports assigned to the 8th replication group include outgoing member ports 13.2, 15.2, 17.2, 19.2; Outgoing member ports assigned to the 9th replication group include outgoing member ports 13.3, 15.3, 17.3, 19.3; assigned to The outgoing member port of the 10th replication group includes the outgoing member ports 13.4, 15.4, 17.4, 19.4; the outgoing member port assigned to the 11th replication group includes the outgoing member ports 13.5, 15.5, 17.5, 19.5; the 12th replication group is assigned The exit members of the group include exit members 13.6, 15.6, 17.6, and 19.6.
  • Process 430 Associate each incoming member port with a set replication group.
  • different replication groups have different replication group IDs.
  • the main control board of the switch 100 associates the incoming member ports 10.1 to 10.6 with the first replication group to the sixth replication group, respectively, and associates the incoming member ports 11.1 to 11.6 with the replication group from the seventh replication group to the twelfth replication group, respectively.
  • Process 440 Assign an identifier to each set of replication groups.
  • the main control board of the switch 100 assigns identifiers A, B, C, D, E, F, G, H, I, J, K, and L to the 12 replication groups.
  • Process 450 Record the chip port of the physical chip to which each outgoing member port of each set of replication group is connected in the forwarding entry of each set of replication group.
  • the main control board of the switch 100 records in the forwarding table entry of the replication group A the chip port connected to the switch chip 12 where the outgoing member port 12.1 is located, the chip port connected to the switch chip 14 where the outgoing member port 14.1 is located, and the outgoing member port.
  • the chip port of the switching chip 16 where 16.1 is located is connected to the chip port of the switching chip 18 where the output interface 18.1 is located.
  • the main control board of the switch 100 is connected to the switching chip in the set forwarding entry of replication group B to replication group F.
  • the chip ports of 12, 14, 16, 18; similarly, the main control board of the switch 100 records the forwarding entries in the set replication group G to replication group L to connect the chip ports of the switching chips 13, 15, 17, and 19.
  • the main control board of the switch 100 synchronizes the forwarding entries of these replication groups to the switching network board 23, and sets the replication chip 10 and the forwarding chip 11 on the physical chips of the incoming member ports 10.1 to 10.6 and 11.1 to 11.6 to set replication
  • a group redirection entry is used to redirect multicast data packets received by each ingress member to their associated replication groups, and send them to the switching network board 23 to find forwarding entries of each replication group to perform forwarding.
  • the main control board of the switch 100 sets 6 ACL entries on the switch chip 10 to redirect the multicast data packets received by the member ports 10.1 to 10.6 to the replication group A to replication F, and on the switch chip 11 Set 6 ACL entries to redirect the multicast data packets received by member ports 11.1 to 11.6 to replication group G to replication group L.
  • an access control list (ACL) entry configured on the switching chip 10; among them, the matching entry is The port identifier is 10.1 and the type of the multicast message.
  • the action item is to add the replication group identifier A and send it to the switching network board 23.
  • An ACL entry configured on chip 10; among them, the match is port 11.6 and the type of the multicast message, and the action is to add the replication group identifier L and send it to the switching network board 23.
  • the matching entry of the redirection entry set by the main control board of the switch 100 is not Contains multicast group addresses.
  • the forwarding chip 12 may The ACL adds a replication group identifier A corresponding to the incoming member interface to the multicast data packet 91, and sends the multicast data packet 91 to the switching network board 23.
  • the switching network board 23 finds the forwarding entry corresponding to the replication group identifier A carried in the multicast data packet 91, and according to the found entry, the four chips of the physical chip where each outgoing member port of the replication group A to be forwarded is located Make four copies.
  • the multicast data packet 91 received from an incoming member port is copied and added with a replication group identifier corresponding to the incoming member port, and then the multicast data packet 91 on the switching network board is copied into multiple packets. And each copied message carries the replication group ID A corresponding to the incoming member port.
  • the forwarding chip of the switching network board 23 identifies the switching chip where each found outbound member is located based on the forwarding entry found, and then sends a multicast data packet 91 carrying the replication group identifier A to each identified switching chip. .
  • the switching chip 23 sends a multicast data packet 91 with the identifier of the replication group A to be forwarded to each chip port in the found forwarding entry of the replication group A to be forwarded.
  • the switch chip 12 on the interface board 21 where the outgoing member interface 12.1 is located receives the multicast data packet 91 carrying the replication group identifier A, strips the replication group identifier A carried in the multicast data message 91, and passes the associated outgoing member interface 12.1 Send a multicast data packet 91;
  • the switch chip 14 on the interface board 21 where the outgoing member port 14.1 is located receives the multicast data packet 91 carrying the replication group identifier A, strips the replication group identifier A, and passes the associated outgoing member port 14.1 Send a multicast data packet 91;
  • the switch chip 16 on the interface board 22 where the outgoing member 16.1 is located receives the multicast data packet 91 carrying the replication group identifier A, strips the replication group identifier A, and passes the associated outgoing member interface 16.1 Send a multicast data message 91;
  • the switch chip 18 on the interface board 22 where the outgoing member 18.1 is located receives the multicast data message 91 carrying the replication group identifier A, strips the replication group identifie
  • the multicast data packet 91 received by the receiving member port 10.1 is copied by the switching network board 23 and sent to the switching chips 12, 14, 16, and 18.
  • the switching network board needs to send multicast data packets to be forwarded to each switching chip where all member ports of the outbound aggregation port are located to perform hash calculations, and then each forwarding chip judges the chip based on the hash calculation result.
  • the member ports of the egress aggregation port allow or block the multicast data packets to be forwarded.
  • the packets received by the switching chip of the interface board of the switch from the switching network board 23 are all packets that need to be forwarded by the switching chip, which not only reduces the switching network.
  • the number of packets that the board needs to copy also reduces the traffic of data packets sent by the switching network board 23 in the switch 100.
  • FIG. 5 is a schematic diagram of forwarding a multicast data packet by a switch 500 according to another example of the present disclosure.
  • an aggregated port 550 of the switch 500 is located on a path connected to the multicast source 200, and is an incoming aggregation port of the multicast group G1. Multiple member ports of the incoming aggregation port 550 are incoming member ports.
  • the aggregation ports 510, 520, and 540 of the switch 500 are respectively located on paths connecting members of the multicast group G1, and are the exit aggregation ports of the multicast group G1.
  • the incoming member ports of the incoming aggregation port 550 are the ports 10.1 to 10.4 of the forwarding chip 10 on the interface board 51.
  • the outgoing member ports of the outgoing aggregation port 510 are the ports 12.1 to 12.4 of the forwarding chip 12 and the ports 13.1 to 13.4 of the forwarding chip 13 on the interface board 52.
  • the outgoing member ports of the outgoing aggregation port 540 are the ports 18.1 to 18.4 of the forwarding chip 18 and the ports 19.1 to 19.4 of the forwarding chip 19 on the interface board 53.
  • the main control board (not shown in FIG. 6) of the switch 500 sets four replication groups based on the number of ingress member ports of the ingress aggregation port 550 of the multicast group.
  • the port bandwidths of the switching chips 12, 13, 14, 15 are smaller than the port bandwidths of the switching chips 18, 19.
  • the main control board of the switch 500 sets the output aggregation port 510 on two output member ports on different forwarding chips, the output aggregation port 520 on two output member ports on different forwarding chips, and an output member port on output aggregation port 540. Assigned to each replication group of the settings, so that each replication group of the settings includes two exit member ports of the aggregation port 510, 520 located on different forwarding chips, and one exit member port of the exit aggregation port 540.
  • the sum of the bandwidths of all the outgoing member ports of the first to fourth replication groups is greater than or equal to the bandwidth of each of the incoming member ports associated with the first to fourth replication groups.
  • the main control board of switch 500 assigns the outgoing member ports of the first replication group to be set to include the outgoing member ports 12.1, 13.1, 14.1, 15.1, and 18.1; the outgoing member ports assigned to the second replication group to be set includes the outgoing member port 12.2, 13.2, 14.2, 15.2, and 18.2; the outgoing member ports assigned to the third replication group include outgoing member ports 12.3, 13.3, 14.3, 15.3, and 18.3; the outgoing member ports assigned to the fourth replication group include outgoing member ports 12.4, 13.4, 14.4, 15.4, and 18.4.
  • the main control board of the switch 500 associates the incoming member ports 10.1 to 10.4 with the first replication group to the fourth replication group respectively; and assigns an identifier to each set replication group.
  • the main control board of the switch 500 records in the forwarding table entry of the first replication group the chip port connected to the switching chip 12 where the outgoing member port 12.1 is located, and the chip port connected to the chip 13 of the switching chip 13 where the outgoing member port 13.1 is located, and connects the outgoing member.
  • the chip port of the switch chip 14 where the port 14.1 is located is connected to the chip port of the switch chip 15 where the outgoing member port 15.1 is located, and the chip port of the switch chip 18 where the outgoing interface 18.1 is located.
  • the main control board of the switch 500 is set at The forwarding entry records of the second replication group to the fourth replication group are connected to the chip ports of the switching chips 12, 13, 14, 15, 18.
  • the main control board of the switch 100 synchronizes the set forwarding entries of the four replication groups to the switching network board 54, and sets four ACLs on the physical chip of the interface board 51 where the incoming member ports 10.1 to 10.4 are located, that is, the forwarding chip 10.
  • the entry serves as a replication group redirection entry.
  • the multicast data packets of the multicast group G1 received by the ingress members 10.1 to 10.4 are respectively redirected to the first replication group to the fourth replication group.
  • the multicast data packets received by each incoming member port are redirected to their associated replication groups, and sent to the switching network board 54 to find the forwarding entries of each replication group to perform forwarding.
  • the action item is to add the identity of the first replication group and send it to the switching network board 54.
  • An ACL table configured on the switching chip 10 Item, where the match is port 10.4 and the multicast group G1 address, and the action is to add the fourth replication group identifier and send it to the switching network board 54. Add the replication group ID of the associated replication group to the multicast data message.
  • the multicast source 500 sends a multicast data packet 92.
  • the forwarding chip 10 may identify the receiving port according to the identifier of the receiving port.
  • the configured ACL entry is found with the multicast group address G1, and the identifier of the first replication group associated with the receiving member port 10.1 is added to the multicast data packet 92 according to the found ACL entry, and the first replication group will be added.
  • the group-identified multicast data message 92 is sent to the switching network board 54.
  • the switching network board 54 finds a forwarding entry corresponding to the first replication group identifier carried in the multicast data packet 92, and copies five based on the five chip ports of the physical chip where the five outgoing member ports are located in the found forwarding entry. Serving.
  • the switching network board 54 sends a multicast data packet 92 with a first replication group identifier to each chip port in the found forwarding entry of the first replication group to be forwarded.
  • the switch chip 12 on the interface board 52 where the outgoing member interface 12.1 is located receives the multicast data packet 92 carrying the first replication group identifier, strips the first replication group identifier, and sends the multicast data message through the associated outgoing member interface 12.1.
  • the switch chip 13 on the interface board 52 where the outgoing member port 13.1 is located receives the multicast data packet 92 carrying the first replication group identifier, strips the first replication group identifier, and sends multicast data through the associated outgoing member port 13.1 Message 92;
  • the switch chip 14 on the interface board 52 where the outgoing member port 14.1 is located receives the multicast data message 92 carrying the first replication group identifier, strips the first replication group identifier, and sends the group through the associated outgoing member port 14.1 Broadcast data packet 92;
  • the switch chip 15 on the interface board 52 where the outgoing member 15.1 is located receives the multicast data message 92 carrying the first replication group identifier, strips the first replication group identifier, and passes the associated outgoing member
  • the examples shown in Figures 5 and 6 use one multicast group as an example.
  • the aggregation interface 210 of the switch 500 receives multicast data packets from other multicast groups, it sets the matching entry in the redirection entry.
  • the multicast group address can redirect data packets of other multicast groups received by each member port of the aggregation port 210 to other replication groups other than the first to fourth replication groups.
  • the switch redirects the received multicast data message to the associated replication group that receives the incoming member port, and locates the outgoing member port included in the replication group.
  • the switch chip sends a multicast data message, which can reduce the messages between switch chips in the switch caused by sending duplicate multicast data messages to all switch chips to calculate the hash in the high-traffic multicast scenario. Traffic, which reduces the risk of packet loss caused by traffic restrictions on the interconnect ports of the switch chip inside the switch.
  • each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, which contains one or more components for implementing a specified logical function. Executable instructions.
  • the functional modules in the various embodiments of the present disclosure may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
  • the technical solution of the present disclosure may be embodied in the form of a software product.
  • the computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the present invention. All or part of the steps of the methods described in the various embodiments are disclosed.
  • the foregoing storage medium includes a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), and various other media that can store program code.

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Abstract

本公开提供了一种组播数据报文转发方法及设备，根据该方法的一个示例，交换机识别待转发的组播数据报文的接收入成员口关联的待转发复制组；其中，待转发复制组包含待转发组播报文所属组播组的每个出聚合口的一个以上的出成员口且当前复制组的所有出成员口位于不同芯片。交换机将待转发组播数据报文重定向到待转发复制组；向待转发复制组的每个出成员口所在的物理芯片发送一份复制的组播数据报文；通过待转发复制组的每个出成员口发送一份复制的组播数据报文。

Description

组播数据报文转发方法及设备
相关申请的交叉引用
本申请要求于2018年05月31日提交中国专利局的申请号为2018105506554，名称为“组播数据报文转发方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
背景技术
随着信息技术的发展，对交换机数据转发能力的要求越来越高。交换机需要复制收到的大流量的组播数据报文例如，视频点播数据报文、语音数据报文，然后发往不同其他设备。
大流量的组播数据报文的转发占用了交换机设备的大量带宽资源。交换机通过聚合端口接收来自组播源的组播数据报文，再通过作为组播组的成员端口的聚合端口发送组播数据播报文。
附图说明
为了更清楚地说明本公开的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本公开的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1是本公开提供的一种组播数据报文转发方法的示意图；
图2为本公开一个例子提供的交换机转发组播数据报文的示意图；
图3示出了图2中交换机内组播数据报文的转发；
图4示出了图2中交换机的复制组的设置流程；
图5为本公开另一例子提供的交换机转发组播数据报文的示意图；
图6示出了图5中交换机内组播数据报文的转发。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合本公开中的附图，对本公开中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本公开的组件可以以各种不同的配置来布置和设计。
图1中，本公开提供的组播数据报文转发方法包括以下处理：
处理111，识别待转发的组播数据报文的接收入成员口关联的待转发复制组。
处理111中，待转发复制组包含待转发组播报文所属组播组的每个出聚合口的一个以上的出成员口且待转发复制组的所有出成员口位于不同芯片。
处理112，将待转发组播数据报文重定向到待转发复制组。
处理113，向待转发复制组的每个出成员口所在的物理芯片发送一份复制的组播数据报文。
处理114，通过待转发复制组的每个出成员口发送一份复制的组播数据报文。
图1所示组播数据报文转发方法向转发组播数据报文的端口所在的芯片发送一份组播数据报文，避免了向其他无需转发组播数据报文的转发芯片发送待转发的数据报文占用的带宽。
图2所示为本实施例的提供的交换机100转发组播数据报文的示意图。图2中，交换机100的聚合口(aggregated port)210位于连接组播源200的路径上，是组播组的入聚合口，入聚合口210的多个成员端口为入成员口。交换机100的聚合口310、320、330以及340分别位于连接组播组各成员的设备301、302、303和304的路径上，是组播组的出聚合口；出聚合口310-340各自的多个成员端口为出成员口。
图3中，入聚合口210的入成员口是接口板20上转发芯片10的端口10.1到10.6及转发芯片11的端口11.1到11.6。出聚合口310的出成员口是接口板21上的转发芯片12的端口12.1到12.6及转发芯片13的端口13.1到13.6。出聚合口320的出成员口是接口板21上转发芯片14的端口14.1到14.6及转发芯片15的端口15.1到15.6。出聚合口330的出成员口是接口板22上转发芯片16的端口16.1到16.6及转发芯片17的端口17.1到17.6。出聚合口340的出成员口是接口板22上转发芯片18的端口18.1到18.6及转发芯片19的端口19.1到19.6。
图4示出了本公开提供的设置复制组的处理：
处理410，基于待转发的组播数据报文的组播组的入聚合口的入成员口数目设置多个复制组。
交换机100的主控板(图2中未示)基于组播组的入聚合口210的入成员口数目设置12个复制组。
处理420，将组播组的每个出聚合口中位于不同物理芯片的一个以上出成员口分配给每个复制组。
出聚合口310的多个出成员口位于交换芯片12和交换芯片13两块不同的交换芯片上。
从组播组的每个出聚合口中分别选取一个出成员口组成一个复制组。
交换机100的主控板分别将出聚合口310、320、330、340的一个出成员口分别分配给 设置的每个复制组，以使每个设置的复制组包含每个出聚合口310、320、330、340的一个出成员口且每个设置的复制组的所有出成员口位于不同物理芯片。
例如，交换机100的主控板分配给设置的第1个复制组的出成员口包括出成员口12.1、14.1、16.1、18.1；分配给设置的第2个复制组的出成员口包括出成员口12.2、14.2、16.2、18.2；分配给第3个复制组的出成员口包括出成员口12.3、14.3、16.3、18.3。分配给设置的第4个复制组的出成员口包括出成员口12.4、14.4、16.4、18.4；分配给第5个复制组的出成员口包括出成员口12.5、14.5、16.5、18.5；交换机100的主控板分配给设置的第6个复制组的出成员口包括出成员口12.6、14.6、16.6、18.6；分配给第7个复制组的出成员口包括出成员口13.1、15.1、17.1、19.1；分配给第8个复制组的出成员口包括出成员口13.2、15.2、17.2、19.2；分配给第9个复制组的出成员口包括出成员口13.3、15.3、17.3、19.3；分配给第10个复制组的出成员口包括出成员口13.4、15.4、17.4、19.4；分配给第11个复制组的出成员口包括出成员口13.5、15.5、17.5、19.5；分配给第12个复制组的出成员口包括出成员口13.6、15.6、17.6、19.6。
处理430，将每个入成员口关联一个设置的复制组。
为每个复制组分配一个复制组标识。其中，不同复制组具有不同的复制组标识。
交换机100的主控板将入成员口10.1至10.6分别关联第1个复制组至第6个复制组,将入成员口11.1至11.6分别关联复制组第7个复制组至第12个复制组。
处理440，为每个设置的复制组分配一个标识。
交换机100的主控板为12个设置的复制组逐个分配标识A、B、C、D、E、F、G、H、I、J、K、L。
处理450，在每个设置的复制组的转发表项中记录连接每个设置的复制组的每个出成员口所在的物理芯片的芯片口。
交换机100的主控板在设置的复制组A的转发表项中记录连接出成员口12.1所在的交换芯片12的芯片口，连接出成员口14.1所在的交换芯片14的芯片口，连接出成员口16.1所在的交换芯片16的芯片口，连接出接口18.1所在的交换芯片18的芯片口；同样地，交换机100的主控板在设置的复制组B至复制组F的转发表项记录连接交换芯片12、14、16、18的芯片口；同样地，交换机100的主控板在设置的复制组G至复制组L的转发表项记录连接交换芯片13、15、17、19的芯片口。
交换机100的主控板将设置的这些复制组的转发表项同步到交换网板23，在入成员口10.1至10.6以及11.1至11.6所在的物理芯片，即转发芯片10以及转发芯片11，设置复制组重定向表项，用以将各入成员口收到组播数据报文重定向到各自关联的复制组，并发 往交换网板23查找各复制组的转发表项执行转发。交换机100的主控板在交换芯片10上设置6个ACL表项，用以将成员口10.1至10.6各自收到的组播数据报文重定向到复制组A至复制F，在交换芯片11上设置6个ACL表项，用以将成员口11.1至11.6各自收到的组播数据报文重定向到复制组G至复制组L。
以入成员口10.1接收到的组播数据报文被重定向到复制组A为例，交换芯片10上配置的一个接入控制表项(access control list，ACL)表项；其中，匹配项是端口标识10.1和组播报文类型，动作项是添加复制组标识A以及发送到交换网板23；以入成员口11.6接收到的组播数据报文被重定向到复制组L为例，交换芯片10上配置的一个ACL表项；其中，匹配项是端口11.6和组播报文类型，动作是添加复制组标识L以及发送到交换网板23。图2中交换机100是分流交换机，需要将组播组的数据流分流到设备301、302、303和304四台设备上，因此，交换机100的主控板设置的重定向表项的匹配项不包含组播组地址。
如图2和图3所示，组播源200发出组播数据报文91，接口板20上的入成员口10.1接收到待转发组播数据报文91后，转发芯片12可以根据预先配置的ACL为该组播数据报文91添加与该入成员口对应的复制组标识A，并将组播数据报文91发送给该交换网板23。交换网板23查找到组播数据报文91携带的复制组标识A对应的转发表项，根据查找到表项中连接待转发复制组A的每个出成员口所在的物理芯片的四个芯片口复制四份。也就是说，从一个入成员口接收到的组播数据报文91被复制添加了与该入成员口对应的复制组标识，然后在交换网板上组播数据报文91被复制成了多份，并且每份复制的报文均携带了与该入成员口对应的复制组标识A。
交换网板23的转发芯片基于查找到转发表项识别每个查找到的出成员口所在的交换芯片，然后向每个识别的交换芯片发送一份携带复制组标识A的组播数据报文91。交换芯片23向查找到的待转发复制组A的转发表项中的每个芯片口发送一份带有待转发复制组A标识的组播数据报文91。
出成员口12.1所在的接口板21上交换芯片12收到携带复制组标识A的组播数据报文91，剥除组播数据报文91携带的复制组标识A，通过关联的出成员口12.1发送组播数据报文91；出成员口14.1所在的接口板21上交换芯片14收到携带复制组标识A的组播数据报文91，剥除复制组标识A，通过关联的出成员口14.1发送组播数据报文91；出成员口16.1所在的接口板22上交换芯片16收到携带复制组标识A的组播数据报文91，剥除复制组标识A，通过关联的出成员口16.1发送组播数据报文91；出成员口18.1所在的接口板22上交换芯片18收到携带复制组标识A的组播数据报文91，剥除复制组标识A，通 过关联的出成员口18.1发送组播数据报文91。
在图3中，接收入成员口10.1接收到的组播数据报文91经交换网板23复制后，发往交换芯片12、14、16和18。某些已有设备中，交换网板需要将待转发组播数据报文发往出聚合口的所有成员口所在的每个交换芯片进行hash计算，然后各转发芯片基于hash计算结果判断本芯片上出聚合口的成员端口允许或者阻塞待转发组播数据报文。
本公开避免上述已有设备存在的问题，本公开中，交换机的接口板的交换芯片从交换网板23接收到的报文都是需要由该交换芯片转发的报文，这样不仅减少了交换网板需要复制的报文数量，还就减少了交换网板23在交换机100内发出的数据报文的流量。
图5所示为本公开另一例子的提供的交换机500转发组播数据报文的示意图。图5中，交换机500的聚合口(aggregated port)550位于连接组播源200的路径上，是组播组G1的入聚合口。入聚合口550的多个成员端口为入成员口。
交换机500的聚合口510、520、540分别位于连接组播组G1的各成员的路径上，是组播组G1的出聚合口。
图6中，入聚合口550的入成员口是接口板51上转发芯片10的端口10.1到10.4。出聚合口510的出成员口是接口板52上的转发芯片12的端口12.1到12.4及转发芯片13的端口13.1到13.4。出聚合口540的出成员口是接口板53上转发芯片18的端口18.1到18.4及转发芯片19的端口19.1到19.4。
交换机500的主控板(图6中未示)基于组播组的入聚合口550的入成员口数目设置4个复制组。
图6中，交换芯片12、13、14、15的端口带宽小于交换芯片18、19的端口带宽。交换机500的主控板将出聚合口510位于不同转发芯片上的2个出成员口、出聚合口520位于不同转发芯片上的2个出成员口，以及出聚合口540的一个出成员口分别分配给设置的每个复制组，以使每个设置的复制组包含出聚合口510、520的2个位于不同转发芯片的出成员口，出聚合口540的一个出成员口。
本实施例中，第一至第四复制组的所有出成员端口的带宽的总和大于或等于第一至第四复制组各自关联的入成员口的带宽。
交换机500的主控板分配给设置的第1个复制组的出成员口包括出成员口12.1、13.1、14.1、15.1以及18.1；分配给设置的第2个复制组的出成员口包括出成员口12.2、13.2、14.2、15.2以及18.2；分配给第3个复制组的出成员口包括出成员口12.3、13.3、14.3、15.3以及18.3；分配给第4个复制组的出成员口包括出成员口12.4、13.4、14.4、15.4 以及18.4。
交换机500的主控板将入成员口10.1至10.4分别关联第1个复制组至第4个复制组；为每个设置的复制组分配一个标识。
交换机500的主控板在设置的第一复制组的转发表项中记录连接出成员口12.1所在的交换芯片12的芯片口，连接出成员口13.1所在的交换芯片13的芯片口，连接出成员口14.1所在的交换芯片14的芯片口，连接出成员口15.1所在的交换芯片15的芯片口，连接出接口18.1所在的交换芯片18的芯片口；同样的，交换机500的主控板在设置的第二复制组至第四复制组的转发表项记录连接交换芯片12、13、14、15、18的芯片口。
交换机100的主控板将设置的这四个复制组的转发表项同步到交换网板54，在入成员口10.1至10.4所在的接口板51的物理芯片，即转发芯片10，设置四个ACL表项作为复制组重定向表项，入成员口10.1至10.4各自收到的组播组G1的组播数据报文分别被重定向到第一复制组至第四复制组。将各入成员口收到的组播数据报文重定向到各自关联的复制组，并发往交换网板54查找各复制组的转发表项执行转发。
以入成员口10.1接收到的组播数据报文被重定向到第一复制组为例，交换芯片10上配置的一个ACL表项；其中，匹配项是端口标识10.1和组播组地址G1，动作项是添加第一复制组标识以及发送到交换网板54；以入成员口10.4接收到的组播数据报文被重定向到第四复制组为例，交换芯片10上配置的一个ACL表项；其中，匹配项是端口10.4和组播组G1地址，动作是添加第四复制组标识以及发送到交换网板54。为组播数据报文添加关联的复制组的复制组标识。
如图5和图6所示，组播源500发出组播数据报文92，接口板51上的入成员口10.1接收到待转发组播数据报文92后，转发芯片10可以根据接收端口标识和组播组地址G1查找到配置的ACL表项，根据查找到的ACL表项为组播数据报文92添加接收入成员口10.1关联的第一复制组的标识，并将带有第一复制组标识的组播数据报文92发送给该交换网板54。
交换网板54查找到组播数据报文92携带的第一复制组标识对应的转发表项，根据查找到的转发表项中连接五个出成员口所在的物理芯片的五个芯片口复制五份。
交换网板54向查找到的待转发第一复制组的转发表项中的每个芯片口发送一份带有第一复制组标识的组播数据报文92。
出成员口12.1所在的接口板52上交换芯片12收到携带第一复制组标识的组播数据报文92，剥除第一复制组标识，通过关联的出成员口12.1发送组播数据报文92；出成员口13.1所在的接口板52上交换芯片13收到携带第一复制组标识的组播数据报文92，剥除第 一复制组标识，通过关联的出成员口13.1发送组播数据报文92；出成员口14.1所在的接口板52上交换芯片14收到携带第一复制组标识的组播数据报文92，剥除第一复制组标识，通过关联的出成员口14.1发送组播数据报文92；出成员口15.1所在的接口板52上交换芯片15收到携带第一复制组标识的组播数据报文92，剥除第一复制组标识，通过关联的出成员口15.1发送组播数据报文92；出成员口18.1所在的接口板22上交换芯片18收到携带第一复制组标识的组播数据报文92，剥除第一复制组标识，通过关联的出成员口18.1发送组播数据报文92。
图5和图6所示的例子以一个组播组为例进行了说明，交换机500的聚合口210收到其他组播组的组播数据报文时，通过设置重定向表项中匹配项的组播组地址，就能将聚合口210的各成员口收到的其他组播组的数据报文重定向到第一到第四复制组之外的其他复制组。
综上所述，本公开提供的组播数据报文转发方法及设备，交换机将接收到组播数据报文重定向到接收入成员口的关联的复制组，向复制组包含的出成员口所在的交换芯片发送一份组播数据报文，能够降低大流量组播场景下，因向全部交换芯片发送复制的组播数据报文用以计算hash而导致的交换机内部交换芯片之间的报文流量，降低了交换机内部的交换芯片的互联端口流量限制导致报文丢失的风险。
在本公开中，流程图或框图中的每个方框可以代表一个模块、程序段或代码的一部分，所述模块、程序段或代码的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。
本公开各个实施例中的各功能模块可以集成在一起形成一个独立的部分，也可以是各个模块单独存在，也可以两个或两个以上模块集成形成一个独立的部分。
本公开的技术方案可以通过软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本公开各个实施例所述方法的全部或部分步骤。而前述的存储介质包括移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、等各种可以存储程序代码的介质。
“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应所述以权利要求的保护范围为准。

Claims (12)

  1. 一种组播数据报文转发方法，应用于交换机，其特征在于，所述方法包括：
    识别待转发的组播数据报文的接收入成员口关联的待转发复制组；所述待转发复制组包含所述待转发组播报文所属组播组的每个出聚合口的一个以上的出成员口且所述待转发复制组的所有出成员口位于不同芯片；
    将待转发组播数据报文重定向到所述待转发复制组；
    向所述待转发复制组的每个出成员口所在的物理芯片发送一份复制的组播数据报文；
    通过所述待转发复制组的每个出成员口发送一份复制的组播数据报文。
  2. 根据权利要求1所述的方法，其特征在于，识别待转发的组播数据报文的接收入成员口关联的待转发复制组之前，所述方法还包括：
    基于所述待转发的组播数据报文的组播组的入聚合口的入成员口数目设置多个复制组；
    将所述组播组的每个出聚合口中位于不同物理芯片的一个以上出成员口分配给每个复制组，以使每个设置的复制组包含每个所述出聚合口的一个以上的出成员口且每个设置的复制组的所有出成员口位于不同物理芯片；
    将每个所述入成员口关联一个设置的复制组；
    为每个设置的复制组分配一个标识；
    在每个设置的复制组的转发表项中记录连接每个设置的复制组的每个出成员口所在的物理芯片的芯片口。
  3. 根据权利要求1所述的方法，其特征在于，将待转发组播数据报文重定向到识别的复制组是为所述待转发组播数据报文添加识别的所述待转发复制组的标识。
  4. 根据权利要求1所述的方法，其特征在于，向识别的复制组的每个出成员口所在的物理芯片发送一份复制的组播数据报文包括:
    查找所述待转发数据报文携带的所述待转发复制组的标识对应的转发表项；
    根据查找到转发表项中连接所述待转发复制组的每个出成员口所在的物理芯片的芯片口数目复制所述待转发的组播数据报文；
    向查找到转发表中每个所述芯片口发送一份携带的所述待转发复制组的标识的所述待转发组播数据报文。
  5. 根据权利要求1所述的方法，其特征在于，通过所述待转发复制组的每个出成员口发送一份复制的组播数据报文，包括：
    收到携带所述待转发复制组的标识的所述待转发组播数据报文的每个物理芯片，剥除 所述待转发复制组的标识，通过所述待转发复制组的标识关联的出成员口发送所述待转发组播数据报文。
  6. 根据权利要求2所述的方法，其特征在于，每个设置的复制组的所有出成员端口的带宽的总和大于或等于自身关联的入成员口的带宽。
  7. 一种组播数据报文转发设备，其特征在于，所述设备包括：主控板，多个接口板以及网板；
    待转发的组播数据报文的接收入成员口所在的接口板，用于识别所述接收入成员口关联的待转发复制组；将待转发组播数据报文重定向到所述待转发复制组；其中，所述待转发复制组包含所述待转发组播报文所属组播组的每个出聚合口的一个以上的出成员口且所述当前复制组的所有出成员口位于不同芯片；
    所述网板向所述待转发复制组的每个出成员口所在的物理芯片发送一份复制的组播数据报文；
    所述待转发复制组的每个出成员口所在的接口板，通过所述待转发复制组的每个出成员口发送一份复制的组播数据报文。
  8. 根据权利要求7所述的设备，其特征在于，所述主控板，用于基于所述待转发的组播数据报文的组播组的入聚合口的入成员口数目设置多个复制组；将所述组播组的每个出聚合口中位于不同物理芯片的一个以上出成员口分配给每个复制组；将每个所述入成员口关联一个设置的复制组；为每个设置的复制组分配一个标识；在每个设置的复制组的转发表项中记录每个设置的复制组的每个出成员口所在的物理芯片的芯片口。
  9. 根据权利要求7所述的设备，其特征在于，待转发的组播数据报文的接收入成员口所在的接口板,用于通过为所述待转发组播数据报文添加识别的所述待转发复制组的标识，将待转发组播数据报文重定向到所述待转发复制组；以及用于将携带所述待转发复制组的标识的所述待转发组播数据报文发往所述网板。
  10. 根据权利要求7所述的设备，其特征在于，所述网板，用于查找所述待转发数据报文携带的所述待转发复制组的标识对应的转发表项；根据查找到转发表项中连接所述待转发复制组的每个出成员口所在的物理芯片的芯片口数目复制所述待转发的组播数据报文；向查找到转发表项中每个所述芯片口发送一份携带的所述待转发复制组的标识的所述待转发组播数据报文。
  11. 根据权利要求7所述的设备，其特征在于，所述待转发复制组的每个出成员口所在的接口板的每个物理芯片，剥除收到所述待转发组播数据报文携带的所述待转发复制组的标识的，通过所述待转发复制组的标识关联的出成员口发送所述待转发组播数据报文。
  12. 根据权利要求8所述的设备，其特征在于，每个设置的复制组的所有出成员端口的带宽的总和大于或等于自身关联的入成员口的带宽。
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