这两个参考模型将为集群路由器的后续研究提供参照系统、实验系统和IP流处理场景。
These models will provide reference systems, experiment systems and IP flow processing scenarios for future studies.
对于集群路由器面临的问题，本文依次从软件平台、负载模型、负载均衡、路由查找等方面展开研究。
This thesis discusses some problems of router cluster, such as software platform, traffic model, load balance, and address lookup.
如前所述，在超级集群拓扑结构中可以使用各种各样的路由器。
As mentioned earlier, various kinds of routers can be used in a super cluster topology.
目前为止，您已经了解了在使用HTTP插件或代理服务器作为路由器时如何配置超级集群拓扑结构。
So far, you have seen how to configure a super cluster topology when the router is either the HTTP plug-in or the proxy server.
超级集群的原理主要依赖于拓扑结构中涉及的各种路由器的请求转发能力。
The principle of the super cluster depends heavily on the request forwarding capabilities of various routers involved in the topologies.
现在，让我们看看在什么情况下需要对超级集群拓扑结构结合使用这两种路由器类型。
Now, let’s examine some reasons why you might want to use of both types of routers together with your super cluster topology.
用于分发客户机请求的路由器的类型直接影响超级集群的应用和相关限制。
The type of router that is used to distribute client requests directly influences the use of a super cluster and its associated limitations.
假设使用的是熟悉的HTTP插件路由器，生成的超级集群拓扑结构类似于图6。
Assuming the use of the familiar HTTP plug-in router, the resulting super cluster topology would look something like Figure 6.
对于超级集群，与使用HTTP插件路由器相比，使用代理服务器的优势在于不需要手动编辑任何静态路由信息。
For super clustering, the advantage of using a proxy server in this configuration instead of the HTTP plug-in router is that there is no need to manually edit any static routing information.
大多数路由器组件在向集群成员(应用服务器)转发请求时都可以维护相应的亲缘性。
Most router components can maintain the appropriate affinities while forwarding requests to the cluster members (application servers).
需要对适用的路由器进行相应配置，使所有WebSphere集群成员都可接收到相同比例的通信。
The applicable router (s) should be configured in a way such that all the WebSphere cluster members receive an equal proportion of traffic.
如图7所示，Web服务器和插件路由器组合将使用严格的轮循(round - robin)方式把HTTP请求转发给所有odr集群成员。
As shown in Figure 7, the Web server and plug-in router combination will forward HTTP requests to all the ODR cluster members in a strict round-robin fashion.
对于集群，http路由器将客户机请求发送给ServerCluster元素中内嵌的所有Server因素。
For a cluster, the HTTP router will send the client requests to all of the Server elements embedded within the ServerCluster element.
配置使用HTTP插件路由器的超级集群拓扑结构的基本步骤包括。
The basic steps involved in configuring a super cluster topology with the HTTP plug-in router are.
路由器并不会检查目标服务器是否确实是已配置的WebSphere集群的一部分。
The router does not check whether the target server is indeed part a configured WebSphere cluster.
相关的WebSphere路由器维护事务关联，并且属于某项事务的所有请求都将被路由到同一 WebSphere集群成员。
The relevant WebSphere router maintains the transactional affinity, and all the requests belonging to a transaction are routed to the same WebSphere cluster member.
本节介绍了如何设置和配置超级集群，使用的路由器为WebSphereApplicationServerHTTP插件。
This section explains how you can set up and configure a super cluster when the router used is the WebSphere Application Server HTTP plug-in.
随需应变路由器将这些请求发送到动态集群，该动态集群是一个应用程序服务器和应用程序实例可以消耗的资源池。
The on demand router sends these requests to dynamic clusters, which represent a pool of resource that application servers and application instances can consume.
如果其中一个集群成员失败，那么路由器可以将客户机请求传递到其他集群成员上的应用程序中。
If one cluster member fails, the router can direct client requests to the application on one of the other cluster members.
如果路由器可被配置为将客户机请求转发给每个集群中的成员，那么就可以有效地解决集群大小受限的问题。
If a router can then be configured to forward client requests to the members of each cluster, then you have effectively addressed the cluster size limitation issue.
通过使用这种配置，D MZ中的Web服务器将使用传统的HTTP插件路由器把请求转发给代理集群成员。
With this configuration, Web servers in the DMZ will forward requests to the proxy cluster members using the traditional HTTP plug-in router.
很明显，有两个关键性组成部分提供应用程序虚拟化功能：随需应变路由器(on demand router)和动态集群。
Notably, there are two components critical to providing application virtualization capabilities: the on demand router and the dynamic cluster.
编辑plugin-cfg.xml文件的主要目的是使HTTP插件路由器相信，分层（超级）集群中的所有成员都属于一个传统的（扁平式）集群。
The main purpose of editing the plugin-cfg.xml file is to make the HTTP plug-in router believe that all the members of the hierarchical (super) cluster belong to a traditional (flattened) cluster.
本文首先分析和比较了现有的负载均衡技术，然后提出了一种基于虚拟路由器集群系统的负载均衡技术。
In this paper, the authors first analyze and compare the existing technologies, and then put forward a new kind of load balancing technology based on virtual router clusters.
本文首先分析和比较了现有的负载均衡技术，然后提出了一种基于虚拟路由器集群系统的负载均衡技术。
In this paper, the authors first analyze and compare the existing technologies, and then put forward a new kind of load balancing technology based on virtual router clusters.
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