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    • 10. 发明授权
    • Routing over large clouds
    • 路过大云
    • US06711152B1
    • 2004-03-23
    • US09345121
    • 1999-07-06
    • Charles Robert Kalmanek, Jr.Anthony G LauckKadangode K. Ramakrishnan
    • Charles Robert Kalmanek, Jr.Anthony G LauckKadangode K. Ramakrishnan
    • H04L1228
    • H04L45/04
    • The present invention discloses an efficient architecture for routing in a very large autonomous system where many of the layer 3 routers are attached to a common connection-oriented layer 2 subnetwork, such as an ATM network. In a preferred embodiment of the invention, a permanent topology of routers coupled to the subnetwork is connected by permanent virtual circuits. The routers can further take advantage of both intra-area and inter-area shortcuts through the layer 2 network to improve network performance. The routers pre-calculate shortcuts using information from link state packets broadcast by other routers and store the shortcuts to a given destination in a forwarding table, along with corresponding entries for a next hop along the permanent topology. The present invention allows the network to continue to operate correctly if layer 2 resource limitations preclude the setup of additional shortcuts.
    • 本发明公开了一种用于在非常大的自治系统中路由的有效架构,其中许多第三层路由器附接到诸如ATM网络的公共连接取向层2子网。 在本发明的优选实施例中,连接到子网的路由器的永久拓扑通过永久虚拟电路连接。 路由器可以进一步利用第二层网络的区域内和区域间快捷方式来改善网络性能。 路由器使用来自其他路由器广播的链路状态分组的信息预先计算快捷方式,并将快捷方式存储在转发表中的给定目的地以及沿着永久拓扑的下一跳的相应条目。 如果第2层资源限制排除了额外的快捷方式的设置,本发明允许网络继续正确地操作。