公开(公告)号：US09197583B2

公开(公告)日：2015-11-24

申请号：US13958746

申请日：2013-08-05

Applicant: Cisco Technology, Inc.

Inventor： John Joseph Mullooly ,  Ali Sajassi ,  Pradosh Kumar Mohapatra ,  Samer M. Salam

IPC: H04L12/933 ,  H04L12/775 ,  H04L12/715

CPC classification number: H04L49/15 ,  H04L45/04 ,  H04L45/58

Abstract: In an embodiment, a method of signaling status at a routing device is provided. In this method, the routing device establishes an inter-chassis control plane channel session with a remote routing device. Here, the routing device and the remote routing device are linked to a multi-homed routing device. The routing device then synchronizes with the remote routing device by way of the inter-chassis control plane channel session to identify a state of a link from the routing device to the multi-homed routing device. The state of the link is thereafter advertised by way of Border Gateway Protocol (BGP). Additionally, a method of discovering inter-chassis communication peers via BGP between the first and remote routing devices is provided.

Abstract translation: 在一个实施例中，提供了一种在路由设备处发信号通知状态的方法。 在该方法中，路由设备与远程路由设备建立机柜间控制平面信道会话。 这里，路由设备和远程路由设备链接到多宿主路由设备。 然后，路由设备通过机架间控制平面信道会话与远程路由设备同步，以识别从路由设备到多归属路由设备的链路的状态。 之后通过边界网关协议（BGP）通告链路的状态。 另外，提供了一种通过第一和远程路由设备之间的BGP发现机架间通信对等体的方法。

公开(公告)号：US20150280940A1

公开(公告)日：2015-10-01

申请号：US14740512

申请日：2015-06-16

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samer Salam ,  Sami Boutros

IPC: H04L12/46 ,  H04L12/18 ,  H04L29/12 ,  H04L12/751

CPC classification number: H04L12/4679 ,  H04L12/1863 ,  H04L45/02 ,  H04L45/48 ,  H04L45/50 ,  H04L61/2069

Abstract: Techniques for stitching multicast trees in a multiple data center environment. According to one embodiment, a technique for stitching multicast trees is provided, which includes determining, at an edge device of a data center, one or more Virtual Local Area Networks (VLANs) assigned to the edge device as a result of a designated forwarder election. An assigned forwarder message is sent by the edge device to one or more devices on the data center, the assigned forwarder message advertising the edge device as a designated forwarder for the VLANs assigned to the edge device. For each of the VLANs assigned to the edge device, the assigned forwarder message causes the edge device to be included in a multicast tree for the VLAN when the assigned forwarder message is received by specific ones of the devices in the data center that are associated with the VLAN.

Abstract translation: 在多数据中心环境中拼接多播树的技术。 根据一个实施例，提供了一种用于拼接多播树的技术，其包括在数据中心的边缘设备处确定由于指定的转发器选举而分配给边缘设备的一个或多个虚拟局域网（VLAN） 。 分配的转发器消息由边缘设备发送到数据中心上的一个或多个设备，所分配的转发器消息将边缘设备通告为分配给边缘设备的VLAN的指定转发器。 对于分配给边缘设备的每个VLAN，分配的转发器消息使得边缘设备被包含在VLAN的多播树中，当分配的转发器消息被数据中心中与数据中心相关联的特定设备接收时 VLAN。

公开(公告)号：US20150071080A1

公开(公告)日：2015-03-12

申请号：US14022382

申请日：2013-09-10

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samer Salam ,  Sami Boutros

IPC: H04L12/733

CPC classification number: H04L45/126 ,  H04L12/4641 ,  H04L45/48 ,  H04L45/66

Abstract: In one embodiment, a particular autonomous system border router (ASBR), in a control-plane media access control (MAC) learning (CPML) network, discovers other ASBRs in the CPML network, the particular ASBR and other ASBRs interconnected with respective ASBRs of a data-plane MAC learning (DPML) network. The particular ASBR calculates one or more internal shortest path first (SPF) trees rooted respectively at each of the other ASBRs in the CPML network, and upon receiving a MAC advertisement route for a given MAC address with a given next-hop IP address, it may determine a distance from the particular and each other ASBR in the CPML network to the given IP address based on the internal SPF trees. In response to the distance from the particular ASBR being shorter than the distance from each other ASBR, the particular ASBR is designated as a designated forwarder (DF) for traffic sourced from the given MAC address.

Abstract translation: 在一个实施例中，在控制平面媒体访问控制（MAC）学习（CPML）网络中的特定自治系统边界路由器（ASBR）发现CPML网络中的其他ASBR，与ASBR相关联的ASBR和ASBR 数据平面MAC学习（DPML）网络。 特定的ASBR计算分别在CPML网络中的每个其他ASBR上的一个或多个内部最短路径优先（SPF）树，并且在接收到具有给定下一跳IP地址的给定MAC地址的MAC广告路由时， 可以根据内部SPF树确定从CPML网络中的特定和彼此ASBR到给定IP地址的距离。 响应于距离特定ASBR的距离短于彼此的距离ASBR，特定ASBR被指定为来自给定MAC地址的流量的指定转发器（DF）。

公开(公告)号：US20150003450A1

公开(公告)日：2015-01-01

申请号：US13930680

申请日：2013-06-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Samer Salam ,  Ali Sajassi ,  Ayan Banerjee ,  Sami Boutros

IPC: H04L12/18

CPC classification number: H04L12/1836

Abstract: In one embodiment, a particular PE device of a plurality of multi-homing PE devices between a core network and a local network determines a subset of traffic for which the particular PE device is responsible. The particular PE also establishes, with itself as root, a multicast tree within the local network for underlay multicast groups. Traffic received at the particular PE from the core network is admitted into the local network only if the core traffic corresponds to the subset of traffic for which the particular PE device is responsible (and mapped into one of the underlay multicast groups for which the particular PE device is the root). Also, multicast traffic received at the particular PE from the local network is forwarded into the core network only if the multicast traffic corresponds to the subset of traffic for which the particular PE device is responsible.

Abstract translation: 在一个实施例中，核心网络和本地网络之间的多个多归属PE设备的特定PE设备确定特定PE设备负责的流量子集。 特定的PE还以本身为根建立本地网络内的组播树，用于底层组播组。 只有当核心流量对应于特定PE设备负责的流量子集（并映射到特定PE的底层多播组中的一个）时，才从核心网络在特定PE处接收到的流量被允许进入本地网络 设备是根）。 此外，仅当组播流量对应于特定PE设备所负责的业务子集时，才将来自本地网络的特定PE处接收到的组播流量转发到核心网络。

公开(公告)号：US12244509B2

公开(公告)日：2025-03-04

申请号：US18298552

申请日：2023-04-11

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Prasad Mishra ,  Nitin Kumar ,  Ali Sajassi ,  Swadesh Agrawal

IPC: H04L12/18 ,  H04L45/00 ,  H04L45/02 ,  H04L45/50 ,  H04L47/32

Abstract: A system and associated methods provide solutions for reducing a volume of traffic through a multicast network attributed to repeated maintenance messages, which are required in order to maintain a multicast connection. The system configures provider edge devices to generate and send maintenance messages on behalf of members of a multicast group to establish and maintain the multicast connection and provides options for determining unknown locations of sources and/or subscribers, thereby reducing the overall volume of traffic transmitted over the multicast network.

公开(公告)号：US12218908B2

公开(公告)日：2025-02-04

申请号：US17677599

申请日：2022-02-22

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Jerome Tollet ,  Ali Sajassi ,  Aloÿs Christophe Augustin ,  Nathan Roland Maryan Skrzypczak ,  Stephane Litkowski

IPC: G06F15/16 ,  G06F9/54 ,  H04L29/06 ,  H04L61/5061 ,  H04L61/5092 ,  H04L101/686

Abstract: Systems, methods, and computer-readable media are provided for securely advertising autoconfigured prefixes in a cloud environment. In some examples, a method can include, receiving, by a first router, an indication of an available network address prefix. In some aspects, the method can also include selecting, by the first router, a first network address prefix that is within the available network address prefix, wherein the first network address prefix provides at least one route to one or more network elements associated with the first router. In some cases, the method may further include sending, to a second router, a message including a stub registration option that indicates the first network address prefix.

公开(公告)号：US20240422140A1

公开(公告)日：2024-12-19

申请号：US18817596

申请日：2024-08-28

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Pradeep Kumar Kathail ,  Samir Thoria

IPC: H04L9/40 ,  H04L45/00

Abstract: A system and method for adaptive encryption for SD-WAN includes identifying an encrypted conversational flow and determining whether a duration of the encrypted conversational flow exceeds a threshold. The method also includes selecting a header-less tunnel for the encrypted conversational flow when the duration is more than the threshold. The method further includes transmitting the encrypted conversational flow to an egress router over the selected header-less tunnel.

公开(公告)号：US20240372747A1

公开(公告)日：2024-11-07

申请号：US18776894

申请日：2024-07-18

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Balaji Pitta Venkatachalapathy ,  Krishnaswamy Muddenahally Ananthamurthy ,  Ali Sajassi ,  Dhananjaya Kasargod Rao

IPC: H04L12/46 ,  H04L45/00 ,  H04L45/02 ,  H04L45/50 ,  H04L45/741 ,  H04L101/622

Abstract: In one embodiment, a method includes receiving, by a route reflector, a subscription request from a first provider edge node in a network and generating a subscription policy for the first provider edge node. The method also includes receiving a first Ethernet Virtual Private Network (EVPN) Type 2 Route from a second provider edge node, assigning a sequence number to the first EVPN Type 2 Route, and communicating the first EVPN Type 2 Route with the sequence number to the first provider edge node. The method further includes receiving a second EVPN Type 2 Route from a third provider edge node, generating an updated sequence number in response to receiving the second EVPN Type 2 Route from the third provider edge node, and communicating the second EVPN Type 2 Route with the updated sequence number to the first provider edge node and the second provider node.

公开(公告)号：US20240314060A1

公开(公告)日：2024-09-19

申请号：US18324574

申请日：2023-05-26

Applicant: Cisco Technology, Inc.

Inventor： Krishnaswamy Ananthamurthy ,  Lukas Krattiger ,  Ali Sajassi

IPC: H04L45/021 ,  H04L45/00 ,  H04L45/586

CPC classification number: H04L45/021 ,  H04L45/586 ,  H04L45/66

Abstract: A method includes creating a first routing table at each of a plurality of provider edge nodes in a first data center, the first routing table including a first sequence number tracking intra-data center movement of the host connected to one of the plurality of provider edge nodes; creating a second routing table at a corresponding gateway of each of a plurality of data centers, the plurality of data centers including the first data center, the second routing table including the first sequence number for the host and a second sequence number for tracking inter-data center movement of the host between the plurality of data centers host; and updating one of (1) the first sequence number when the host makes an intra-data center move, or (2) the second sequence number in the second routing table when the host makes an inter-data center move.

公开(公告)号：US12088552B2

公开(公告)日：2024-09-10

申请号：US18172225

申请日：2023-02-21

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samir Thoria ,  Lukas Krattiger ,  Manoj Kumar Pandey

IPC: H04L61/5053 ,  H04L9/40 ,  H04L61/5014 ,  H04L101/622

CPC classification number: H04L61/5053 ,  H04L61/5014 ,  H04L63/0236 ,  H04L63/101 ,  H04L2101/622

Abstract: Systems and techniques are provided for synchronizing DHCP snoop information. In some examples, a method can include, performing, by a first PE device from a plurality of PE devices, DHCP snooping of a first plurality of DHCP messages between a DHCP client and a DHCP server, wherein the plurality of PE devices is part of an ethernet segment for multihoming the DHCP client. In some aspects, the method includes determining, based on snooping the first plurality of DHCP messages, an association between an IP address corresponding to the DHCP client and a MAC address corresponding to the DHCP client. In some examples, the method includes sending, by the first PE device to at least one other PE device from the plurality of PE devices, a first route advertisement that includes the association between the IP address corresponding to the DHCP client and the MAC address corresponding to the DHCP client.