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1. 发明授权

US07835276B2 Admission control mechanism for multicast receivers 有权
标题翻译：多播接收机接入控制机制
公开(公告)号：US07835276B2
公开(公告)日：2010-11-16
申请号：US11026465
申请日：2004-12-30
申请人： Chickayya G. Naik , Toerless Eckert , Senthilkumar Krishnamurthy
发明人： Chickayya G. Naik , Toerless Eckert , Senthilkumar Krishnamurthy
IPC分类号： H04L12/28
CPC分类号： H04L12/1428 , H04L12/185 , H04L47/15 , H04L47/20 , H04L47/2441 , H04L47/70 , H04L47/765 , H04L47/806 , H04L63/101 , H04L63/1458
摘要： A method and system for controlling admission of an end user to a multicast channel over a network implementing a source filtering protocol. Incoming packet traffic received by an edge router is snooped and, when a request to join a multicast channel is received, the traffic is analyzed. Any service policy associated with the traffic class is found and applied to packet traffic from the requesting user. The actions include accepting membership in a group associated with a multicast channel and pushing the packets to the end user. If the action is to deny membership, then the multicast packets are prevented from reaching the end user. In addition information is logged and may be used for billing purposes or for accumulating marketing or other such information. Also, the actions may be to limit the number of routing states, by denying admittance to a groups once a limit number of requests to join, or other such parameter, is reached. Such limiting will substantially prevent DOS attacks on a multicast router.
摘要翻译：一种用于通过实现源过滤协议的网络来控制终端用户接入多播信道的方法和系统。窥探由边缘路由器接收的入局分组流量，并且当接收到加入多播信道的请求时，分析流量。发现与流量类相关联的任何服务策略，并将其应用于来自请求用户的数据包流量。这些动作包括接受与多播信道相关联的组中的成员资格并将分组推送到最终用户。如果该动作是拒绝成员身份，则防止组播数据包到达最终用户。此外，信息被记录并且可以用于计费目的或用于累积营销或其他此类信息。此外，动作可以是限制路由状态的数量，一旦达到限制的加入请求数或其他此类参数，拒绝向组进行导入。这种限制将大大阻止对组播路由器的DOS攻击。

2. 发明授权

US08625603B1 Systems and methods for multicast switching in a private VLAN 有权
标题翻译：私有VLAN中组播切换的系统和方法
公开(公告)号：US08625603B1
公开(公告)日：2014-01-07
申请号：US13104554
申请日：2011-05-10
申请人： Vijayan Ramakrishnan , Marco E. Foschiano , Chickayya G. Naik
发明人： Vijayan Ramakrishnan , Marco E. Foschiano , Chickayya G. Naik
IPC分类号： H04L12/28 , G06F9/00
CPC分类号： H04L12/4641 , H04L45/16 , H04L49/201 , H04L49/354
摘要： A Multicast Listener Discovery (MLD) protocol query and/or report snooping process is modified to appropriately map secondary PVLAN identifiers to corresponding primary PVLAN identifiers, thereby accommodating other system elements that are otherwise unaware of primary/secondary PVLAN distinctions. Special cases are also accommodated where reverse path forwarding (RPF) checks in support of multicast operation might otherwise fail due to primary/secondary PVLAN distinctions. Additional steps are taken to ensure that PVLAN information properly accounts for changes in configuration and/or location of various network hosts.
摘要翻译：修改多播侦听器发现（MLD）协议查询和/或报告侦听进程，以将辅助PVLAN标识符适当地映射到对应的主PVLAN标识符，从而容纳否则不知道主/次PVLAN区别的其他系统元素。还适用于支持多播操作的反向路径转发（RPF）检查可能由于主要/次要PVLAN区别而失败的特殊情况。采取额外的步骤来确保PVLAN信息正确地解决了各种网络主机的配置和/或位置的变化。

3. 发明授权

US07953089B1 Systems and methods for multicast switching in a private VLAN 有权
标题翻译：私有VLAN中组播切换的系统和方法
公开(公告)号：US07953089B1
公开(公告)日：2011-05-31
申请号：US11434728
申请日：2006-05-16
申请人： Vijayan Ramakrishnan , Marco E. Foschiano , Chickayya G. Naik
发明人： Vijayan Ramakrishnan , Marco E. Foschiano , Chickayya G. Naik
IPC分类号： H04L12/28 , H04L12/56 , H04L12/54 , G06F9/26 , G06F9/34
CPC分类号： H04L12/4641 , H04L45/16 , H04L49/201 , H04L49/354
摘要： A Multicast Listener Discovery (MLD) protocol query and/or report snooping process is modified to appropriately map secondary PVLAN identifiers to corresponding primary PVLAN identifiers, thereby accommodating other system elements that are otherwise unaware of primary/secondary PVLAN distinctions. Special cases are also accommodated where reverse path forwarding (RPF) checks in support of multicast operation might otherwise fail due to primary/secondary PVLAN distinctions. Additional steps are taken to ensure that PVLAN information properly accounts for changes in configuration and/or location of various network hosts.
摘要翻译：修改多播侦听器发现（MLD）协议查询和/或报告侦听进程，以将辅助PVLAN标识符适当地映射到对应的主PVLAN标识符，从而容纳否则不知道主/次PVLAN区别的其他系统元素。还适用于支持多播操作的反向路径转发（RPF）检查可能由于主要/次要PVLAN区别而失败的特殊情况。采取额外的步骤来确保PVLAN信息正确地解决了各种网络主机的配置和/或位置的变化。

4. 发明授权

US06839348B2 System and method for distributing multicasts in virtual local area networks 失效
标题翻译：在虚拟局域网中分发多播的系统和方法
公开(公告)号：US06839348B2
公开(公告)日：2005-01-04
申请号：US09303296
申请日：1999-04-30
申请人： Cheng Tang , Chickayya G. Naik
发明人： Cheng Tang , Chickayya G. Naik
IPC分类号： H04L12/18 , H04L12/46 , H04L12/56 , H04L12/28
CPC分类号： H04L45/16 , H04L12/18 , H04L12/185 , H04L12/4645 , H04L45/04
摘要： The invention relates to a system and method for efficiently distributing multicast messages within computer networks configured to have one or more virtual local area network (VLAN) domains. A multicast network device (MND), having a plurality of interfaces, includes a multicast controller for efficiently distributing multicast messages among subscribing entities associated with various VLAN domains. The multicast controller, which is in communicating relationship with the interfaces, includes a VLAN assignment engine for assigning responsibility for the VLAN domains to the extent there are multiple MNDs. The multicast controller also accesses a multicast tag source to establish a plurality of novel VLAN tags for efficiently distributing multicast messages, including a sub-regional Multicast VLAN Identifier (MVLAN-ID) that encompasses all of the VLAN domains for which the respective MND is responsible, and one or more color-limited MVLAN-IDs that encompass all of the VLAN domains for which the MND is responsible except for one. The multicast controller then tags multicast messages with its sub-regional or a color-limited MVLAN-ID depending on whether the message is considered internal or external by the respective MND. The tagged messages are then forwarded for distribution to the subscribers associated with the various VLAN domains.

5. 发明授权

US08090805B1 System and method for performing cascaded lookups to forward packets 有权
标题翻译：用于执行级联查找以转发数据包的系统和方法
公开(公告)号：US08090805B1
公开(公告)日：2012-01-03
申请号：US10780022
申请日：2004-02-17
申请人： Mukul Chawla , Chickayya G. Naik , Jason A. Marinshaw
发明人： Mukul Chawla , Chickayya G. Naik , Jason A. Marinshaw
IPC分类号： G06F15/177 , G06F15/173
CPC分类号： H04L45/16 , H04L12/00 , H04L45/745
摘要： Cascading a lookup over multiple lookup tables when performing multicast forwarding involves accessing a first lookup table based on at least part of a multicast destination address included in a packet header. The first lookup table identifies the portion (e.g., one or more entries) of a second lookup table in response to a key generated from a first portion of the packet header. The portion of the second lookup table can be accessed based on a second portion of the packet header. The second lookup table identifies at least one output interface via which the packet should be output. Such systems and methods may, in some embodiments, allow existing hardware to be used to support a new addressing format that involves larger addresses than were previously supported by that hardware.
摘要翻译：在执行多播转发时，对多个查找表进行级联查找涉及基于分组报头中包括的多播目的地地址的至少一部分访问第一查找表。第一查找表响应于从分组报头的第一部分生成的密钥来识别第二查找表的部分（例如，一个或多个条目）。可以基于分组报头的第二部分来访问第二查找表的部分。第二查找表标识出应该输出分组的至少一个输出接口。在一些实施例中，这样的系统和方法可以允许现有硬件用于支持与先前由该硬件支持的地址相比较大的地址的新寻址格式。

6. 发明授权

US06553028B1 Method and apparatus for multicast switching using a centralized switching engine 有权
标题翻译：使用集中式交换引擎进行组播切换的方法和装置
公开(公告)号：US06553028B1
公开(公告)日：2003-04-22
申请号：US09302823
申请日：1999-04-30
申请人： Cheng Tang , Chickayya G. Naik , Jonathan Davar , Yiqun Cai
发明人： Cheng Tang , Chickayya G. Naik , Jonathan Davar , Yiqun Cai
IPC分类号： H04L1228
CPC分类号： H04L45/02 , H04L45/16
摘要： A technique implements forwarding operation shortcuts at a switch for multicast data traffic routed between subnetworks of a computer network. A first multicast frame is forwarded from the switch to a router, which peforms route processing and forwarding operations for a packet encapsulated within the frame. During execution of the operations, the router provides multicast flow and additional information concerning the routed packet to the switch in accordance with a novel multicast shortcut control protocol. The information is used by the switch to implement a novel multicast shortcut for subsequent frames received at the switch having the multicast packet flow.
摘要翻译：一种技术在交换机上实现转发操作快捷方式，用于在计算机网络的子网之间路由的多播数据流量。第一组播帧从交换机转发到路由器，该路由器对封装在帧内的分组进行路由处理和转发操作。在执行操作期间，路由器根据新的组播快捷控制协议向交换机提供有关路由分组的组播流和附加信息。交换机使用该信息为具有组播分组流的交换机接收到的后续帧实现新颖的多播快捷方式。

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