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公开(公告)号：US07672253B2
公开(公告)日：2010-03-02
申请号：US11834445
申请日：2007-08-06
申请人： Yi Yang , Russell Ivan White , Alvaro E. Retana , Abhay Kumar Roy
发明人： Yi Yang , Russell Ivan White , Alvaro E. Retana , Abhay Kumar Roy
CPC分类号： H04L45/02
摘要： An example embodiment of the present invention provides a process relating to the selective filtering of an LSA at a not-so-stubby-sub-area (NSSSA) border router. In one embodiment, the border router receives an LSA from another router inside the NSSSA, which might be in the access layer of the hierarchical network design model and which might use OSPF as its IGP. If the LSA is Type 1 and includes a subnet route or forwarder address, the border router floods it to its neighboring routers, regardless of whether they are inside the NSSSA. If the LSA is Type 7 and includes a host address, the border router floods it to a neighboring router if the neighboring router is inside the NSSSA, but filters the LSA if the neighboring router is outside the NSSSA, for example, in an OSPF area in the distribution layer of the hierarchical network design model.
摘要翻译： 本发明的一个示例性实施例提供了一种涉及在不那样的子区域（NSSSA）边界路由器上的LSA的选择性过滤的过程。 在一个实施例中，边界路由器从NSSSA内部的另一个路由器接收LSA，该LSA可能位于分层网络设计模型的接入层中，并且可能使用OSPF作为其IGP。 如果LSA为Type 1，并且包含子网路由或转发地址，则边界路由器会将其泛洪到邻近路由器，而不管它们是否位于NSSSA内。 如果LSA为Type 7并且包含主机地址，则如果相邻路由器位于NSSSA内，则边界路由器会将其洪泛到邻近路由器，如果相邻路由器在NSSSA之外，则过滤LSA，例如OSPF区域 在分层层次的网络设计模型中。
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公开(公告)号：US20090041037A1
公开(公告)日：2009-02-12
申请号：US11834445
申请日：2007-08-06
申请人： Yi Yang , Russell Ivan White , Alvaro E. Retana , Abhay Kumar Roy
发明人： Yi Yang , Russell Ivan White , Alvaro E. Retana , Abhay Kumar Roy
IPC分类号： H04L12/56
CPC分类号： H04L45/02
摘要： An example embodiment of the present invention provides a process relating to the selective filtering of an LSA at a not-so-stubby-sub-area (NSSSA) border router. In one embodiment, the border router receives an LSA from another router inside the NSSSA, which might be in the access layer of the hierarchical network design model and which might use OSPF as its IGP. If the LSA is Type 1 and includes a subnet route or forwarder address, the border router floods it to its neighboring routers, regardless of whether they are inside the NSSSA. If the LSA is Type 7 and includes a host address, the border router floods it to a neighboring router if the neighboring router is inside the NSSSA, but filters the LSA if the neighboring router is outside the NSSSA, for example, in an OSPF area in the distribution layer of the hierarchical network design model.
摘要翻译： 本发明的一个示例性实施例提供了一种涉及在不那样的子区域（NSSSA）边界路由器上的LSA的选择性过滤的过程。 在一个实施例中，边界路由器从NSSSA内部的另一个路由器接收LSA，该LSA可能位于分层网络设计模型的接入层中，并且可能使用OSPF作为其IGP。 如果LSA为Type 1，并且包含子网路由或转发地址，则边界路由器会将其泛洪到邻近路由器，而不管它们是否位于NSSSA内。 如果LSA为Type 7并且包含主机地址，则如果相邻路由器位于NSSSA内，则边界路由器会将其洪泛到邻近路由器，如果相邻路由器在NSSSA之外，则过滤LSA，例如OSPF区域 在分层层次的网络设计模型中。
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公开(公告)号：US07639680B1
公开(公告)日：2009-12-29
申请号：US09971298
申请日：2001-10-04
IPC分类号： H04L12/56
CPC分类号： H04L45/28 , H04L45/02 , H04L45/021 , H04L45/026 , H04L45/563 , H04L45/60 , Y10S707/99952
摘要： A method and apparatus resynchronizes a link state database (LSDB) of a non-stop forwarding (NSF) router with the LSDB of a neighboring router (“neighbor”) while maintaining an existing adjacency with the neighbor in a computer network. An out-of-band resynchronization process executes on the routers to essentially maintain the existing adjacency between the router and neighbor, rather than resetting that adjacency as defined by a conventional resynchronization approach. By keeping the adjacency “up” from the perspective of a routing protocol, such as the Open Shortest Path First routing protocol, the adjacency can be used for continued data traffic to and from the NSF router.
摘要翻译： 一种方法和装置在不间断转发（NSF）路由器的链路状态数据库（LSDB）与邻近路由器（“邻居”）的LSDB重新同步，同时在计算机网络中保持与邻居的现有邻接。 在路由器上执行带外重新同步过程，以基本上维护路由器和邻居之间的现有邻接关系，而不是重新设置由常规重新同步方法定义的邻接关系。 通过从路由协议（例如开放最短路径优先路由协议）的角度保持邻接“邻接”，邻接可以用于来自NSF路由器的连续数据流量。
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公开(公告)号：US08040795B2
公开(公告)日：2011-10-18
申请号：US11431873
申请日：2006-05-10
申请人： Sina Mirtorabi , Mukhtiar Shaikh , Abhay Kumar Roy , Yousuf Hasan
发明人： Sina Mirtorabi , Mukhtiar Shaikh , Abhay Kumar Roy , Yousuf Hasan
摘要： A SONET network terminated by routers includes working paths and backup paths. The routers pre-establishes in their link state data bases the links in both for both the working and backup paths. However, the links involved in the backup paths are given higher costs, then the links working paths, that the routers select only the links in the working path. If there is a failure in a link in a working path, an APS arrangement provides rapid switchover of the optical links so as to substitute one or more links in the corresponding backup path. This is accomplished by changing the relative costs of the working and backup links involved, so that the routers select the backup links for their routing tables.
摘要翻译： 由路由器终止的SONET网络包括工作路径和备份路径。 路由器在其链路状态数据库中预先建立了两个工作路径和备份路径的链路。 然而，备份路径中涉及的链路的成本较高，则链路工作路径，路由器只选择工作路径中的链路。 如果工作路径中的链路发生故障，则APS安排可以快速切换光链路，以替代相应备份路径中的一个或多个链路。 这是通过更改所涉及的工作和备份链路的相对成本来实现的，以便路由器为其路由表选择备份链路。
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5.发明授权Support of unidirectional link in IS-IS without IP encapsulation and in presence of unidirectional return path 有权支持IS-IS中的单向链路，无需IP封装，存在单向返回路径公开(公告)号：US07957380B2
公开(公告)日：2011-06-07
申请号：US11284639
申请日：2005-11-21
IPC分类号： G01R31/08 , G06F11/00 , G08C15/00 , H04J1/16 , H04J3/14 , H04L1/00 , H04L12/26 , H04L12/28 , H04L12/56
摘要： The present invention supports the operation of IS-IS over UDLs without the need for encapsulation of IS-IS PDUs in IP and without the need for a large-scale upgrade of the protocol in the network. The present invention also supports adjacency establishment when the return path from a router at the receive end of a to the router at the transmit end of the unidirectional link is via another unidirectional link.
摘要翻译： 本发明支持IS-IS在UDL上的操作，而不需要在IP中封装IS-IS PDU，而不需要大量升级网络中的协议。 当在单向链路的发送端的路由器到路由器的返回路径经由另一个单向链路时，本发明还支持邻接建立。
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6.发明授权Dynamic use of backup path computation elements across domains of a computer network 有权在计算机网络的域上动态使用备份路径计算元素公开(公告)号：US07886079B2
公开(公告)日：2011-02-08
申请号：US12706567
申请日：2010-02-16
IPC分类号： G06F15/173
CPC分类号： H04L47/10 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/28 , H04L45/42 , H04L47/125 , H04L63/0272 , H04L2212/00
摘要： In one embodiment, one or more path computation requests from path computation clients (PCCs) in a first network domain are received at a first border router (BR) arranged at the border of the first network domain and a second network domain. The first BR learns of a path computation element (PCE) in the second network domain. The PCE in the second network domain is informed of path computation information for the first network domain. One or more tunnels are established between the first BR and the PCE in the second network domain. One or more path computation requests from PCCs in the first network domain are passed from the first BR, through the one or more tunnels, to the PCE in the second network domain, to be serviced by the PCE in the second network domain using the path computation information for the first network domain.
摘要翻译： 在一个实施例中，在布置在第一网络域和第二网络域的边界处的第一边界路由器（BR）处接收来自第一网络域中的路径计算客户端（PCC）的一个或多个路径计算请求。 第一个BR学习第二个网络域中的路径计算元素（PCE）。 第二网域的PCE通知第一网域的路径计算信息。 在第二网络域中的第一BR和PCE之间建立一个或多个隧道。 来自第一网络域中的PCC的一个或多个路径计算请求从第一BR通过一个或多个隧道传递到第二网络域中的PCE，以由第二网络中的PCE使用路径 第一网域的计算信息。
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7.发明授权Dynamic path computation element load balancing with backup path computation elements 有权动态路径计算元素与备份路径计算元素的负载平衡公开(公告)号：US07668971B2
公开(公告)日：2010-02-23
申请号：US12013096
申请日：2008-01-11
IPC分类号： G06F15/173
CPC分类号： H04L47/10 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/28 , H04L45/42 , H04L47/125 , H04L63/0272 , H04L2212/00
摘要： In one embodiment, a first path computation element (PCE) operates between first and second network domains, and is adapted to service requests from path computation clients (PCCs) in at least the first domain. In response to a backup event (e.g., failure of a second PCE), a backup PCE in the second domain may be informed of path computation information for the first domain used by the first PCE, and tunnels may be bi-directionally established between the first PCE and the backup PCE. Once the tunnels are established, the backup PCE may be advertised into the first domain, and the backup PCE may operate to load balance service requests for the first domain through the bi-directionally established tunnels.
摘要翻译： 在一个实施例中，第一路径计算元件（PCE）在第一和第二网络域之间操作，并且适于在至少第一域中对来自路径计算客户端（PCC）的请求进行服务。 响应于备份事件（例如，第二PCE的故障），可以向第二域中的备用PCE通知第一PCE使用的第一域的路径计算信息，并且隧道可以在第二域之间双向建立 第一个PCE和备份PCE。 一旦建立了隧道，备用PCE可以被通告到第一域，并且备份PCE可以通过双向建立的隧道来操作以对第一域的业务请求进行负载平衡。
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8.发明申请DYNAMIC PATH COMPUTATION ELEMENT LOAD BALANCING WITH BACKUP PATH COMPUTATION ELEMENTS 有权动态路径计算元件负载平衡与备用路径计算元件公开(公告)号：US20100146149A1
公开(公告)日：2010-06-10
申请号：US12706567
申请日：2010-02-16
IPC分类号： G06F15/173 , H04L12/56
CPC分类号： H04L47/10 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/28 , H04L45/42 , H04L47/125 , H04L63/0272 , H04L2212/00
摘要： In one embodiment, one or more path computation requests from path computation clients (PCCs) in a first network domain are received at a first border router (BR) arranged at the border of the first network domain and a second network domain. The first BR learns of a path communication element (PCE) in the second network domain. The PCE in the second network domain is informed of path computation information for the first network domain. One or more tunnels are established between the first BR and the PCE in the second network domain. One or more path computation requests from PCCs in the first network domain are passed from the first BR, through the one or more tunnels, to the PCE in the second network domain, to be serviced by the PCE in the second network domain using the path computation information for the first network domain.
摘要翻译： 在一个实施例中，在布置在第一网络域和第二网络域的边界处的第一边界路由器（BR）处接收来自第一网络域中的路径计算客户端（PCC）的一个或多个路径计算请求。 第一个BR学习第二个网络域中的路径通信元素（PCE）。 第二网域的PCE通知第一网域的路径计算信息。 在第二网络域中的第一BR和PCE之间建立一个或多个隧道。 来自第一网络域中的PCC的一个或多个路径计算请求从第一BR通过一个或多个隧道传递到第二网络域中的PCE，以由第二网络中的PCE使用路径 第一网域的计算信息。
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9.发明申请DYNAMIC PATH COMPUTATION ELEMENT LOAD BALANCING WITH BACKUP PATH COMPUTATION ELEMENTS 有权动态路径计算元件负载平衡与备用路径计算元件公开(公告)号：US20090182894A1
公开(公告)日：2009-07-16
申请号：US12013096
申请日：2008-01-11
IPC分类号： G06F15/173
CPC分类号： H04L47/10 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/28 , H04L45/42 , H04L47/125 , H04L63/0272 , H04L2212/00
摘要： In one embodiment, a first path computation element (PCE) operates between first and second network domains, and is adapted to service requests from path computation clients (PCCs) in at least the first domain. In response to a backup event (e.g., failure of a second PCE), a backup PCE in the second domain may be informed of path computation information for the first domain used by the first PCE, and tunnels may be bi-directionally established between the first PCE and the backup PCE. Once the tunnels are established, the backup PCE may be advertised into the first domain, and the backup PCE may operate to load balance service requests for the first domain through the bi-directionally established tunnels.
摘要翻译： 在一个实施例中，第一路径计算元件（PCE）在第一和第二网络域之间操作，并且适于在至少第一域中对来自路径计算客户端（PCC）的请求进行服务。 响应于备份事件（例如，第二PCE的故障），可以向第二域中的备用PCE通知第一PCE使用的第一域的路径计算信息，并且隧道可以在第二域之间双向建立 第一个PCE和备份PCE。 一旦建立了隧道，备用PCE可以被通告到第一域，并且备份PCE可以通过双向建立的隧道来操作以对第一域的业务请求进行负载平衡。
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