Tellabs San Jose, Inc.

Brocade Communications Systems, Inc.

Tellabs Operations, Inc.

Sanjay Khanna

Ivy Pei-Shan Hsu

David S Curry

Sheng-Yih Wang

Lok Yan Hui

Ravi Medikonda

Granville D Dillon

Balaji Rajagopalan

Rishi Mehta

Vivek Venkatraman

Ravindra Sunkad

Samer Isam Nubani

Man-Tung T Hsiao

Robert Colvin

Paul M Hallinan

Ajay Virginkar

A solution for virtual router redundancy for server virtualization includes, at a network device configured as a backup router of a virtual router, examining a packet stored in a memory of the network device. Responsive to the examining, the network device determines whether to forward the packet via a network towards a destination or to send the packet via the network to a master router of the virtual router for forwarding of the packet, by the master router, towards the destination.

Virtual router redundancy for server virtualization

A method or corresponding apparatus is employed for distributing media on a ring network. Multiple nodes and communications links are configured to distribute media in the ring network. Distribution of the media is disabled on a communications link between a selected pair of adjacent nodes in the ring network in a manner maintaining communications between the selected pair of adjacent nodes other than for distribution of the media. This configuration results in a 'horseshoe' topology of the ring network with respect to the media, where distribution of the media on the ring network occurs in one or two downstream directions from head-end ingress node(s) on the ring network. Virtual Private LAN Service (VPLS) may be employed to transport the media. In an event of a link or node failure, the disabled link is enabled, allowing for continued distribution of the media with network recovery in a timeframe typically unobservable by an end user.

Method and apparatus for media distribution using VPLS in a ring topology

Differentiated services for network traffic using weighted quality of service is provided. Network traffic is queued into separate per flow queues, and traffic is scheduled from the per flow queues into a group queue. Congestion management is performed on traffic in the group queue. Traffic is marked with priority values, and congestion management is performed based on the priority values. For example, traffic can be marked as 'in contract' if it is within a contractual limit, and marked as 'out of contract' if it is not within the contractual limit. Marking can also include classifying incoming traffic based on Differentiated Service Code Point. Higher priority traffic can be scheduled from the per flow queues in a strict priority over lower priority traffic. The lower priority traffic can be scheduled in a round robin manner.

Differentiated services using weighted quality of service (QoS)

A method of managing faults in a ring network may include configuring a ring network to be in a 'horseshoe' topology by disabling a communications link from distributing media between a selected pair of adjacent nodes while allowing other communications or non-related media to continue to be distributed via the adjacent nodes. In the event of a failure, the disabled communications path may be re-enabled, and first or second backup communications paths may be employed, where the first backup communications path may use primary connections between adjacent nodes used for primary communications paths normally used to carry the media, and the second backup communications paths may use secondary connections between non-adjacent nodes. The disabled communications path may be dynamically moved in a logical or physical manner in an event of a communications link or node failure to maintain a 'horseshoe' topology in the ring network.

Method and apparatus for managing faults in a ring network

A method or corresponding apparatus in an exemplary embodiment of the present invention determines how many copies of a multicast packet are to be sent, as copies, to multiple destinations based on information in the multicast packet and a group (e.g., bridge node) with which the packet is associated. The copies of the multicast packets are then generated. After generating the copies, an action to take for each copy is determined. This determination is made using the information in the multicast packet and based on the group with which the packet is associated. After the action is determined for each copy, the action is performed on each copy. Through use of an embodiment of the present invention, memory space is conserved, allowing for continued use of a device in a multicast environment of an ever growing network, such as the Internet.

Method and apparatus for multicast forwarding

Growing community of inventors

Fremont, CA, United States of America

Sanjay Khanna