公开(公告)号：US07167443B1

公开(公告)日：2007-01-23

申请号：US09393752

申请日：1999-09-10

申请人： Ram Dantu ,  Gary Ester ,  Pete O'Connell

发明人： Ram Dantu ,  Gary Ester ,  Pete O'Connell

IPC分类号： G01R31/08

CPC分类号： H04L49/309 ,  H04J2203/006 ,  H04J2203/0066 ,  H04J2203/0067 ,  H04J2203/0089 ,  H04L12/437 ,  H04L2012/5627 ,  H04L2012/563 ,  H04L2012/5631 ,  H04L2012/5672 ,  H04Q11/0062 ,  H04Q11/0066 ,  H04Q2011/0081 ,  H04Q2011/0086 ,  H04Q2011/0088 ,  H04Q2011/0092

摘要： An apparatus and a method for forwarding data packets through a fiber optic ring network includes forwarding data packets on a packet by packet basis. A node on the fiber optic ring network decides on a packet by packet basis whether to transmit on the working or protection path. Because this decision is being made on a packet level, reservation of throughput resources no longer is made at a one to one ratio. Rather, protection path resources are reserved at a ratio significantly less than one to one. In one embodiment, no resources are reserved for path restoration or protection path routing. Rather, quality of service provisioning is used to resolve interference situations wherein instantaneous demand exceeds capacity. A node evaluates ring conditions in relation to the demand of traffic resources and the relative quality of service ratings to determine whether and how to forward a packet. Additionally, a node decides whether to use the working or protection path by considering the final destination on the fiber optic ring network, any identified ring conditions and, in some embodiments, quality of service. The ring conditions to which the inventive nodes respond include OSI layer 1, layer 2 and layer 3 conditions.

摘要翻译： 通过光纤环网转发数据分组的装置和方法包括：逐包转发数据分组。 光纤环网上的一个节点决定逐个分组地在工作或保护路径上进行传输。 由于这种决定是在分组级别进行的，所以不再以一比一的比例预留吞吐量资源。 相反，保护路径资源以显着小于一比一的比例保留。 在一个实施例中，没有为路径恢复或保护路径路由保留资源。 相反，服务质量提供用于解决干扰情况，其中瞬时需求超过容量。 节点根据流量资源的需求和服务等级的相对质量评估环境条件，以确定是否以及如何转发数据包。 另外，节点通过考虑光纤环网上的最终目的地，任何识别的环状况，以及在一些实施例中，决定是否使用工作或保护路径。 本发明节点响应的环境条件包括OSI层1，层2和层3条件。

公开(公告)号：US06532088B1

公开(公告)日：2003-03-11

申请号：US09393747

申请日：1999-09-10

申请人： Ram Dantu ,  Pete O'Connell

发明人： Ram Dantu ,  Pete O'Connell

IPC分类号： H04B1020

CPC分类号： H04J14/0283 ,  H04J14/0227 ,  H04J14/0228 ,  H04J14/0238 ,  H04J14/0241 ,  H04J14/0293 ,  H04L45/00 ,  H04L45/22 ,  H04L45/28 ,  H04Q11/0062 ,  H04Q11/0066 ,  H04Q2011/0073 ,  H04Q2011/0081

摘要： An apparatus and a method for transporting IP user traffic over a fiber optic ring network that includes a plurality of fiber optic ring network nodes. One ring is for conducting the user traffic on a working path and the other ring is for conducting the same user traffic on a protection path in the event of a failure in a communication link in the first ring on a protection path. A central node is coupled to a plurality of nodes to provide forwarding tables and updates to the nodes. As a result, IP traffic may be routed through the fiber optic ring network in a manner that provides fast switching from a working path to a protection path to minimize lost data packets whenever a communication link in the working path fails. Additionally, this capability is provided without requiring each node to have full IP routing capability. The forwarding tables for the protection and working paths provide for path routes and forwarding for the packets on a packet by packet basis. Accordingly, a ring may serve as both a working path and a protection path according to the origin and destination of the data packets traveling thereon. Additionally, the central node is adapted to generate multiple forwarding tables to accommodate packet by packet forwarding in a network created to support virtual private networks. The forwarding tables also are set up to support multicast transmissions of data packets.

摘要翻译： 一种用于在包括多个光纤环网络节点的光纤环网上传送IP用户业务的装置和方法。 一环是用于在工作路径上进行用户流量，而另一个环用于在保护路径上的第一环中的通信链路中发生故障的情况下，在保护路径上执行相同的用户流量。 中央节点耦合到多个节点以向节点提供转发表和更新。 结果，IP通信可以以提供从工作路径到保护路径的快速切换的方式通过光纤环路进行路由，以在工作路径中的通信链路发生故障时最小化丢失的数据分组。 另外，提供了这种能力，而不需要每个节点具有完整的IP路由能力。 保护和工作路径的转发表为逐包提供路由路由和转发报文。 因此，环可以根据其上行进的数据分组的起点和目的地同时作为工作路径和保护路径。 此外，中央节点适于生成多个转发表以适应在创建以支持虚拟专用网络的网络中的分组转发。 转发表也被设置为支持数据分组的多播传输。