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    • 7. 发明授权
    • Routing apparatus and method for high-speed mesh connected local area
network
    • 高速网状局域网路由设备及方法
    • US5179558A
    • 1993-01-12
    • US746796
    • 1991-08-12
    • Charles P. ThackerLawrence C. Stewart
    • Charles P. ThackerLawrence C. Stewart
    • G06F15/173
    • G06F15/17381
    • A packet routing apparatus allows numerous packets to be routed simultaneously through a mesh connected network. The network consists of a number of interconnected switches which are coupled, in turn, to the hosts that are members of the local network. The switches are nonblocking switches that are coupled to each other and to the hosts by a multiplicity of point to point links. Each switch has a routing mechanism for automatically routing received packets toward their specified destinations. For each received packet the router generates a routing mask representing the output links that may be used to route the packet towards its destination. The routing mask includes a broadcast bit. If the broadcast bit is ON, the packet must be simultaneously routed to all of the output links specified by the routing mask. If the broadcast bit is OFF, the packet may be routed on any single one of the links specified by the routing mask. To ensure that every packet makes progress towards its destination, packets are processed in the order of their arrival by placing the corresponding routing masks in a queue. Periodically, the set of available output links is compared with all of the routing masks. Using a first come, first considered routing discipline, the first routing mask in the queue to match the available output lines is selected. A routing selection is then generated for the corresponding packet and the selected routing mask is removed from the queue.
    • 分组路由设备允许通过网状连接的网络同时路由许多分组。 该网络由多个互连的交换机组成,这些交换机又连接到作为本地网络成员的主机。 交换机是非阻塞交换机,其通过多个点对点链路彼此耦合并连接到主机。 每个交换机都有一个路由机制,用于自动将收到的数据包路由到其指定的目的地。 对于每个接收的数据包,路由器生成一个路由掩码,表示可用于将数据包路由到其目的地的输出链路。 路由掩码包括广播位。 如果广播位为ON,则该数据包必须同时路由到路由掩码指定的所有输出链路。 如果广播位为OFF,则可以在由路由掩码指定的任何一个链路上路由数据包。 为了确保每个数据包都朝着目的地进行,通过将相应的路由掩码放在队列中,按照到达顺序对数据包进行处理。 定期将可用输出链路的集合与所有路由掩码进行比较。 使用先到先得的路由规则,选择队列中匹配可用输出行的第一个路由掩码。 然后为相应的分组生成路由选择,并且从队列中移除选择的路由掩码。