CN1921457A - 一种网络设备和基于多核处理器的报文转发方法 - Google Patents

一种网络设备和基于多核处理器的报文转发方法 Download PDF

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CN1921457A
CN1921457A CNA2006101542008A CN200610154200A CN1921457A CN 1921457 A CN1921457 A CN 1921457A CN A2006101542008 A CNA2006101542008 A CN A2006101542008A CN 200610154200 A CN200610154200 A CN 200610154200A CN 1921457 A CN1921457 A CN 1921457A
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message
taxon
unit
session
core
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CN100466629C (zh
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龚一斌
常利民
傅志刚
孟丹
任治国
王飓
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New H3C Technologies Co Ltd
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Hangzhou Huawei 3Com Technology Co Ltd
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Abstract

本发明公开了一种网络设备和基于多核处理器的报文转发方法。该网络设备中包括：分类单元和包括多个核(Core)单元的转发处理单元。分类单元在网络设备的任意一个端口接收到报文时，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；转发处理单元中的任意一个Core单元，在接收到报文时进行报文转发处理。本发明可以通过分类单元选择Core单元的做法来实现各个Core单元之间的负载均衡，使得各个Core单元能够并发地执行报文转发处理，从而有效地提高了网络设备的报文转发处理能力，从根本上保证了网络设备的报文转发处理。

Description

一种网络设备和基于多核处理器的报文转发方法
技术领域
本发明涉及网络通信技术，特别是涉及一种网络设备和基于多核处理器的报文转发方法。
背景技术
在网络通信过程中，具有路由器功能的网络设备(为便于描述，以下将具有路由器功能的网络设备简称为网络设备)在接收到报文时，根据报文头中的地址信息对报文进行一系列的转发处理，比如转发入处理、表项查找处理和转发出处理等。
随着通信业务的不断发展，网络设备往往需要同时对大量的报文进行转发处理。这样，则要求网络设备必须具有较高的处理能力。
图1是在现有技术中网络设备内部的结构示意图。参见图1，为了提高网络设备的处理能力，保证网络设备在接收到大量报文时，能够完成转发处理，现有技术的处理方式为：将网络设备的不同物理端口分布在不同的接口板上，并在每一个接口板上设置一个CPU；当网络设备在各个物理端口上分别接收到报文后，由各个物理端口所在接口板上的CPU分别对报文进行转发处理。
由以上描述可以看出，在现有技术中，保证网络设备在同时接收到大量报文时可完成转发处理的方式为：由网络设备中的不同CPU同时进行不同端口上的报文转发处理。但是，此种方式存在以下缺点：当网络设备在自身的一个或几个物理端口上接收到大量报文，而在其他物理端口上却未接收到报文或接收到少量报文时，则会出现网络设备中的一个或几个CPU需要进行大量的报文转发处理，处理速度无法满足报文的转发处理要求，而其他CPU则处于空闲状态，因此，导致了CPU之间的负载不均衡，无法有效地提高网络设备的报文转发处理能力，从而无法从根本上保证网络设备的报文转发处理。
发明内容
有鉴于此，本发明的主要目的在于提供一种网络设备，本发明的另一目的在于提供一种基于多核处理器的报文转发方法，从而有效地提高网络设备的报文转发处理能力。
为了达到上述目的，本发明的技术方案是这样实现的：
一种网络设备，该网络设备中包括：分类单元和包括多个核Core单元的转发处理单元，其中，
分类单元，用于在网络设备的任意一个端口接收到报文时，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；
转发处理单元中的任意一个Core单元，在接收到报文时进行报文转发处理。
所述分类单元，在网络设备接收到报文时，确定报文所属的会话，从转发处理单元中选择与所确定报文所属会话对应的Core单元。
所述转发处理单元中的任意一个Core单元，进一步用于在初始接收到一个会话的报文后，确定该报文所属会话是否需要保序，在确定不需要保序后，将携带该报文所属会话信息的非保序通知发送至分类单元；
所述分类单元，判断所确定的报文所属会话与非保序通知中携带的会话信息是否相同，在判断出不相同后，从转发处理单元中选择与报文所属会话对应的Core单元。
所述分类单元中包括第一级分类单元和多个第二级分类单元，其中，
第一级分类单元，用于在网络设备的一个端口接收到报文时，从多个第二级分类单元中选择一个第二级分类单元，将报文发送至所选的第二级分类单元；
任意一个第二级分类单元，用于在接收到报文时，从转发处理单元中选择Core单元。
所述任意一个Core单元中包括多个串联的Core，该多个串联的Core用于对接收到的报文分别进行各级报文转发处理。
该网络设备进一步包括：发送调度单元，
转发处理单元中的任意一个Core单元，进一步用于将报文转发处理后的报文发送至发送调度单元；
发送调度单元，用于对转发处理单元中Core单元发来的报文进行发送调度。
所述发送调度单元包括：第一级发送调度单元和多个第二级发送调度单元，其中，
第一级发送调度单元，用于在接收到转发处理单元中Core单元发来的报文后，从多个第二级发送调度单元中选择一个第二级发送调度单元，将Core单元发来的报文发送至所选的第二级发送调度单元；
任意一个第二级发送调度单元，用于在接收到Core单元发来的报文时，对报文进行发送调度。
该网络设备进一步包括：控制Core，用于生成指导报文转发处理的控制信息，将该控制信息发送至转发处理单元中的各个Core单元；
转发处理单元中的任意一个Core单元，用于根据接收到的控制信息，对接收到的报文进行报文转发处理。
所述分类单元为Core、FPGA或ASIC。
所述发送调度单元为Core、FPGA或ASIC。
一种基于多核处理器的报文转发方法，在网络设备中设置分类单元和包括多个核Core单元的转发处理单元，该方法还包括：
A、分类单元接收发送给网络设备的报文，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；
B、所选的Core单元对接收到的报文进行报文转发处理。
该方法进一步包括：设置经过所述网络设备的不同会话与不同Core单元之间的对应关系；
在步骤A中，所述选择Core单元的步骤包括：分类单元确定报文所属的会话，根据所设置的对应关系，从转发处理单元中选择与报文所属会话对应的Core单元。
在分类单元确定报文所属的会话之后，并在选择Core单元之前，进一步包括：分类单元判断是否需要对所确定的报文所属会话进行保序，如果是，则继续执行所述的根据所设置的对应关系从转发处理单元中选择与所确定会话对应的Core单元的步骤。
所述分类单元判断是否需要对所确定的报文所属会话进行保序的步骤包括：所述分类单元判断所述网络设备需要对所述报文进行的处理是否存在保序要求，如果是，则确定需要对所确定的报文所属会话进行保序。
该方法进一步包括：设置不需要保序的会话信息；
所述分类单元判断是否需要对所确定的报文所属会话进行保序的步骤包括：分类单元判断在所设置的不需要保序的会话信息中是否可查找到所确定的报文所属的会话信息，如果不可查找到，则确定需要对所确定的报文所属会话进行保序。
所述设置不需要保序的会话信息的步骤包括：任意一个Core单元在初始接收到一个会话的报文后，根据报文中携带的特征信息，判断该会话的报文是否顺序到达，如果没有顺序到达，则将该会话的信息携带在非保序通知中发送至分类单元；分类单元根据接收到的非保序通知设置不需要保序的会话信息。
在步骤A中，所述选择Core单元的步骤包括：分类单元监测各个Core单元的业务负荷量，从转发处理单元中选择当前业务负荷量最小的Core单元；或者，分类单元从转发处理单元中任意选择一个Core单元。
该方法进一步包括：设置调度策略；
在步骤B之后，进一步包括：根据所设置的调度策略对报文转发处理后的报文进行调度。
由此可见，本发明具有以下优点：
1、在本发明中，分类单元可以根据特定的策略选择Core单元，从而将网络设备不同端口上的报文分发到转发处理单元中的不同Core单元，这样，则可以通过分类单元选择Core单元的做法来实现各个Core单元之间的负载均衡，使得各个Core单元能够并发地执行报文转发处理，从而有效地提高了网络设备的报文转发处理能力，从根本上保证了网络设备的报文转发处理。
2、在本发明中，分类单元通过选择Core单元，可以实现同一个会话的所有报文在同一个Core单元上进行报文转发处理，这样，对于存在保序要求的会话则避免了报文乱序问题，提高了业务服务质量。
3、在本发明中，对于不存在保序要求的会话，分类单元可以将该会话的不同报文分发到不同的Core单元上进行报文转发处理，进一步保证了Core单元上的负载均衡，使系统达到最佳的总体性能。
附图说明
图1是在现有技术中网络设备内部的结构示意图。
图2是在本发明中网络设备内部的基本结构示意图。
图3是在本发明中包括两级分类单元的网络设备的基本结构示意图。
图4是在本发明中Core单元中包括多个Core的网络设备的基本结构示意图。
图5是在本发明中网络设备内部的第一种优化结构示意图。
图6是在本发明中包括两级发送调度单元的网络设备的第一种优化结构示意图。
图7是在本发明中网络设备内部的第二种优化结构示意图。
图8是在本发明中包括两级分类单元的网络设备的优化结构示意图。
图9是在本发明中Core单元中包括多个Core的网络设备的优化结构示意图。
图10是在本发明中同时包括控制Core和发送调度单元的优化结构示意图。
图11是在本发明实施例中基于多核处理器实现报文转发处理的流程图。
具体实施方式
目前，多核处理器是一种内部集成了多个执行核心以及专用加速处理单元的通用处理器，多核处理器中的多个执行核心可以完全并发的执行指令，在不提升处理器工作频率的情况下使处理器的处理能力得到很大的提升。
基于多核处理器的上述优点，为了更加有效地提高网络设备的报文转发处理能力，本发明提出了一种具有多核处理器的网络设备。图2是在本发明中网络设备内部的基本结构示意图。参见图2，在本发明中，具有多核处理器的网络设备内部包括：分类单元和包括多个核(Core)单元的转发处理单元，其中，
分类单元，用于在网络设备的任意一个端口接收到报文时，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；
转发处理单元中的任意一个Core单元，在接收到报文时进行报文转发处理。
图3是在本发明中包括两级分类单元的网络设备的基本结构示意图。参见图2和图3，为了提升分类处理效率，使分类单元不会成为系统处理的瓶颈，在本发明中，网络设备内部的分类单元具体可以包括两级分类单元，即第一级分类单元和多个第二级分类单元，其中，
第一级分类单元，用于在网络设备的一个端口接收到报文时，从多个第二级分类单元中选择一个第二级分类单元，将报文发送至所选的第二级分类单元；
任意一个第二级分类单元，用于在接收到报文时，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元。
图4是在本发明中Core单元中包括多个Core的网络设备的基本结构示意图。参见图2和图4，在本发明中，转发处理单元的每一个Core单元可以由多个串联的Core组成，该多个串联的Core用于对接收到的报文分别进行各级报文转发处理，即由该多个串联的Core共同完成对报文的报文转发处理。
图5是在本发明中网络设备内部的第一种优化结构示意图。参见图2和图5，在本发明中，较佳地，具有多核处理器的网络设备内部还可以进一步包括：发送调度单元，
转发处理单元中的任意一个Core单元，进一步用于将转发处理后的报文发送至发送调度单元；
发送调度单元，用于对转发处理单元中各个Core单元发来的报文进行发送调度。
图6是在本发明中包括两级发送调度单元的网络设备的第一种优化结构示意图。参见图5和图6，在本发明中，网络设备内部的发送调度单元具体可以包括：第一级发送调度单元和多个第二发送调度单元，其中，
第一级发送调度单元，用于在接收到转发处理单元中各个Core单元发来的报文后，从多个第二级发送调度单元中选择一个第二级发送调度单元，将各个Core单元发来的报文发送至所选的第二级发送调度单元；
任意一个第二级发送调度单元，用于在接收到各个Core单元发来的报文时，对报文进行发送调度。
图7是在本发明中网络设备内部的第二种优化结构示意图。参见图2和图7，在本发明中，较佳地，具有多核处理器的网络设备内部还可以进一步包括：控制Core，用于生成指导报文转发处理的控制信息，将该控制信息发送至转发处理单元中的Core单元；
转发处理单元中的Core单元，用于根据接收到的控制信息，对报文进行转发处理。
需要说明的是，上述图3至图7只是针对网络设备内部的基本结构和优化结构列举了几种可能的组成情况。在具体的业务实现中，上述图3至图7的中的组成结构也可以进行任意组合。比如，参见图8所示，网络设备中可以同时包括图3中所示的两级分类单元和图5中所示的发送调度单元；再如，参见图9所示，网络设备中可以同时包括图4中所示的Core单元中的多个Core以及图5中所示的发送调度单元；又如，参见图10所示，网络设备中可以同时包括图7中所示的控制Core和图5中所述的发送调度单元。
相应的，本发明还提出了一种基于多核处理器的报文转发方法，其核心思想是：在网络设备中设置分类单元和包括多个核Core单元的转发处理单元；分类单元接收发送给网络设备的报文，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；所选的Core单元对接收到的报文进行报文转发处理。
为使本发明的目的、技术方案和优点更加清楚，下面结合附图及具体实施例对本发明作进一步地详细描述。
图11是在本发明实施例中基于多核处理器实现报文转发处理的流程图。参见图2至图11，在本发明中，基于多核处理器实现报文转发处理的过程包括以下步骤：
步骤1101：预先在网络设备中设置分类单元和包括多个核Core单元的转发处理单元。
这里，转发处理单元中的各个Core单元是由多核处理器的各个Core组成的。
参见图3，较佳地，在本步骤中，所设置的分类单元中可以包括第一级分类单元和多个第二级分类单元。参见图4，较佳地，在本步骤中，所设置的每一个Core单元可以由多个串联的Core组成。
步骤1102：预先在网络设备中设置发送调度单元。
在本步骤中，设置发送调度单元是为了在后续过程中通过发送调度单元的发送调度，保证网络设备发送出去的报文符合特定的服务质量要求，比如对于报文延迟、抖动和丢包率等的要求。
参见图6，较佳地，在本步骤中，所设置的发送调度单元中可以包括第一级发送调度单元和多个第二级发送调度单元。
步骤1103：预先在网络设备中设置控制Core。
步骤1104：在网络设备运行过程中，控制Core生成指导报文转发处理的控制信息，将该控制信息发送至转发处理单元中的各个Core单元。
这里，所述的控制信息可以包括指导报文转发处理的任意一种信息，比如路由表等。
步骤1105：当网络设备在一个端口上接收到报文时，分类单元接收该报文，并从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元。
这里，参见图3，在本发明中，当网络设备内部包括第一级分类单元和多个第二级分类单元时，本步骤1105的过程具体包括：由第一级分类单元接收网络设备端口上的报文，然后该第一级分类单元从多个第二级分类单元中选择一个第二级分类单元，将报文发送至所选的第二级分类单元；该所选的第二级分类单元在接收到报文时，执行从转发处理单元中选择Core单元的过程。其中，
第一级分类单元从多个第二级分类单元中选择一个第二级分类单元的具体实现过程可以包括但不限于以下两种方式：
方式A、第一级分类单元实时监测各个第二级分类单元的业务负荷情况，并从中选择一个当前业务负荷量最小的第二级分类单元；
方式B、第一级分类单元根据报文中携带的部分会话信息，选择一个第二级分类单元。比如，对于携带特定源地址的报文，第一级分类单元选择第二级分类单元1，对于携带特定目的地址的报文，第一级分类单元选择第二级分类单元2等。
在本步骤1105中，分类单元(当分类单元中包括第一级分类单元和多个第二分类单元时，此处所述的分类单元为第一级分类单元所选择的第二级分类单元)从转发处理单元中选择Core单元的具体实现过程包括但不限于以下方式：
方式一、根据报文所属会话进行选择。
在该方式一中，预先设置经过所述网络设备的不同会话与不同Core单元之间的对应关系；分类单元接收到报文时，确定报文所属的会话，根据所设置的对应关系，从转发处理单元中选择与报文所属会话对应的Core单元。
较佳地，为了进一步提高报文转发处理效率，在本发明中，对于需要保序的会话，可以采用方式一，选择同一个Core单元对该会话的所有报文进行转发处理；对于不需要保序的会话，可以不采用方式一，利用不同的Core单元对该会话的所有报文进行转发处理。因此，在该方式一中，当分类单元确定报文所属会话后，分类单元可以首先判断是否需要对所确定的报文所属会话进行保序，如果是，则继续执行方式一中所述的根据所设置的对应关系从转发处理单元中选择与所确定会话对应的Core单元的步骤，否则，不采用方式一，而采用其他方式选择Core单元。
其中，所述分类单元判断是否需要对所确定的报文所属会话进行保序的实现过程包括：
所述分类单元判断所述网络设备后续需要对所述报文进行的处理是否存在保序要求，如果是，则认定需要对所确定的报文所属会话进行保序，否则，认定不需要对所确定的报文所属会话进行保序；
或者，预先设置不需要保序的会话信息，分类单元判断在所设置的不需要保序的会话信息中是否可查找到所确定的报文所属的会话信息，如果不可查找到，则确定需要对所确定的报文所属会话进行保序，如果可查找到，则确定不需要对所确定的报文所属会话进行保序。其中，所述设置不需要保序的会话信息的实现过程可以为：预先根据实际业务需要，直接在分类单元中设置不需要保序的会话信息；或，任意一个Core单元在初始接收到一个会话的前一个或几个报文后，根据报文中携带的特征信息，判断该会话的报文是否顺序到达，如果没有顺序到达，则确定该会话的报文不需要保序，将该会话的信息携带在非保序通知中发送至分类单元；分类单元根据接收到的非保序通知设置不需要保序的会话信息。
在该方式一中，分类单元确定报文所属会话的过程包括：当接收到的报文为IPv4报文时，分类单元根据报文中携带的五元组(源IP地址、目的IP地址、协议类型、源端口号和目的端口号)以及私网索引信息确定报文所属的会话；当接收到的报文为IPv6报文时，分类单元根据报文中携带的源IP地址以及流标记信息确定报文所属的会话；当接收到的报文为多协议标签交换(MPLS)报文时，分类单元根据报文中携带的最外层标签信息确定报文所属的会话；当接收到的报文为以太网二层交换报文时，分类单元根据报文中携带的源媒质接入控制(MAC)地址和目的MAC地址信息确定报文所属的会话。
方式二、根据转发处理单元中各个Core单元的业务负荷情况进行选择。
在该方式二中，分类单元实时监测各个Core单元的业务负荷量；在本步骤中，分类单元从转发处理单元中选择当前业务负荷量最小的Core单元。
方式三、分类单元从转发处理单元中任意选择Core单元。
步骤1106：所选的Core单元根据控制Core发来的控制信息，对接收到的报文进行报文转发处理。
这里，所述的报文转发处理为现有技术，但可以举例为：第一次外层转发处理、内层转发处理和第二次外层转发处理。
参见图4，在本发明中，当所设置的每一个Core单元由多个串联的Core组成时，在本步骤1106中，是由所选Core单元中各个串联的Core共同完成各级报文转发处理，比如，所选的Core单元中包括3个串联的Core，那么，在本步骤中，可以由串联的第一个Core完成第一次外层转发处理，由串联的第二个Core完成内层转发处理，并由串联的第三个Core完成第二次外层转发处理。
步骤1107：发送调度单元根据预先设置的调度策略对报文转发处理后的报文进行发送调度。
这里，参见图6，在本发明中，当网络设备内部包括第一级发送调度单元和多个发送调度单元时，本步骤的具体实现过程可以包括：第一级发送调度单元接收转发处理单元中Core单元发来的报文，从多个第二级发送调度单元中选择一个第二级发送调度单元，将Core单元发来的报文发送至所选的第二级发送调度单元；第二级发送调度单元在接收到Core单元发来的报文时，根据预先设置的调度策略对报文进行发送调度。
其中，所述第一级发送调度单元选择第二级发送调度单元的方式可以包括：随机选择，或根据业务符合情况选择，或根据不同Core单元与不同第二级发送调度单元间的对应关系进行选择等。
至此，则实现了对报文进行报文转发处理的过程。
需要说明的是，在本发明中，所述的分类单元可以是多核处理器中的Core，也可以是其他可完成分类单元功能的硬件单元，比如可编程逻辑阵列(FPGA)或专用集成电路(ASIC)等。
并且，在本发明中，所述的发送调度单元可以是多核处理器中的Core，也可以是其他可完成发送调度单元功能的硬件单元，比如FPGA或ASIC等。
总之，以上所述仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (18)

1、一种网络设备，其特征在于，该网络设备中包括：分类单元和包括多个核Core单元的转发处理单元，其中，
分类单元，用于在网络设备的任意一个端口接收到报文时，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；
转发处理单元中的任意一个Core单元，在接收到报文时进行报文转发处理。
2、根据权利要求1所述的网络设备，其特征在于，所述分类单元，在网络设备接收到报文时，确定报文所属的会话，从转发处理单元中选择与报文所属会话对应的Core单元。
3、根据权利要求2所述的网络设备，其特征在于，所述转发处理单元中的任意一个Core单元，进一步用于在初始接收到一个会话的报文后，确定该报文所属会话是否需要保序，在确定不需要保序后，将携带该报文所属会话信息的非保序通知发送至分类单元；
所述分类单元，判断所确定的报文所属会话与非保序通知中携带的会话信息是否相同，在判断出不相同后，从转发处理单元中选择与报文所属会话对应的Core单元。
4、根据权利要求1所述的网络设备，其特征在于，所述分类单元中包括第一级分类单元和多个第二级分类单元，其中，
第一级分类单元，用于在网络设备的一个端口接收到报文时，从多个第二级分类单元中选择一个第二级分类单元，将报文发送至所选的第二级分类单元；
任意一个第二级分类单元，用于在接收到报文时，从转发处理单元中选择Core单元。
5、根据权利要求1所述的网络设备，其特征在于，所述任意一个Core单元中包括多个串联的Core，该多个串联的Core用于对接收到的报文分别进行各级报文转发处理。
6、根据权利要求1所述的网络设备，其特征在于，该网络设备进一步包括：发送调度单元，
转发处理单元中的任意一个Core单元，进一步用于将报文转发处理后的报文发送至发送调度单元；
发送调度单元，用于对转发处理单元中Core单元发来的报文进行发送调度。
7、根据权利要求6所述的网络设备，其特征在于，所述发送调度单元包括：第一级发送调度单元和多个第二级发送调度单元，其中，
第一级发送调度单元，用于在接收到转发处理单元中Core单元发来的报文后，从多个第二级发送调度单元中选择一个第二级发送调度单元，将Core单元发来的报文发送至所选的第二级发送调度单元；
任意一个第二级发送调度单元，用于在接收到Core单元发来的报文时，对报文进行发送调度。
8、根据权利要求1所述的网络设备，其特征在于，该网络设备进一步包括：控制Core，用于生成指导报文转发处理的控制信息，将该控制信息发送至转发处理单元中的各个Core单元；
转发处理单元中的任意一个Core单元，用于根据接收到的控制信息，对接收到的报文进行报文转发处理。
9、根据权利要求1至8中任意一项所述的网络设备，其特征在于，所述分类单元为Core、FPGA或ASIC。
10、根据权利要求6或7所述的网络设备，其特征在于，所述发送调度单元为Core、FPGA或ASIC。
11、一种基于多核处理器的报文转发方法，其特征在于，在网络设备中设置分类单元和包括多个核Core单元的转发处理单元，该方法还包括：
A、分类单元接收发送给网络设备的报文，从转发处理单元中选择Core单元，将接收到的报文发送至所选的Core单元；
B、所选的Core单元对接收到的报文进行报文转发处理。
12、根据权利要求11所述的方法，其特征在于，该方法进一步包括：设置经过所述网络设备的不同会话与不同Core单元之间的对应关系；
在步骤A中，所述选择Core单元的步骤包括：分类单元确定报文所属的会话，根据所设置的对应关系，从转发处理单元中选择与报文所属会话对应的Core单元。
13、根据权利要求12所述的方法，其特征在于，在分类单元确定报文所属的会话之后，并在选择Core单元之前，进一步包括：分类单元判断是否需要对所确定的报文所属会话进行保序，如果是，则继续执行所述的根据所设置的对应关系从转发处理单元中选择与所确定会话对应的Core单元的步骤。
14、根据权利要求13所述的方法，其特征在于，所述分类单元判断是否需要对所确定的报文所属会话进行保序的步骤包括：所述分类单元判断所述网络设备需要对所述报文进行的处理是否存在保序要求，如果是，则确定需要对所确定的报文所属会话进行保序。
15、根据权利要求13所述的方法，其特征在于，该方法进一步包括：设置不需要保序的会话信息；
所述分类单元判断是否需要对所确定的报文所属会话进行保序的步骤包括：分类单元判断在所设置的不需要保序的会话信息中是否可查找到所确定的报文所属的会话信息，如果不可查找到，则确定需要对所确定的报文所属会话进行保序。
16、根据权利要求15所述的方法，其特征在于，所述设置不需要保序的会话信息的步骤包括：任意一个Core单元在初始接收到一个会话的报文后，根据报文中携带的特征信息，判断该会话的报文是否顺序到达，如果没有顺序到达，则将该会话的信息携带在非保序通知中发送至分类单元；分类单元根据接收到的非保序通知设置不需要保序的会话信息。
17、根据权利要求11所述的方法，其特征在于，在步骤A中，所述选择Core单元的步骤包括：分类单元监测各个Core单元的业务负荷量，从转发处理单元中选择当前业务负荷量最小的Core单元；或者，分类单元从转发处理单元中任意选择一个Core单元。
18、根据权利要求11所述的方法，其特征在于，该方法进一步包括：设置调度策略；
在步骤B之后，进一步包括：根据所设置的调度策略对报文转发处理后的报文进行调度。
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