Cisco Technology, Inc.

Francois Le Faucheur

Anna Charny

Eric Michel Levy-Abegnoli

Jean-Philippe Vasseur

John William Evans

Ashok Narayanan

Pascal Thubert

Wojciech Dec

Eric C Rosen

Daniel C Tappan

Luc Louis Revardel

Parag Kumar Jain

Mark Grayson

David R Oran

William Mark Townsley

Ole Troan

Horia Miclea

Ashwini Dahiya

Clarence Filsfils

Kent Kinchu Leung

Anand K Oswal

Jayaraman R Iyer

Brian Eliot Weis

Robert Drew Major

Toerless Eckert

Alton Lo

Subhasri Dhesikan

Ali C Begen

Sandeep Bajaj

James Martin Polk

Frederick Juergens Baker

Mark John Baugher

Eric G Vyncke

Viren K Malaviya

Qi Wang

Bruce Albert Thompson

Hussein Farouk Salama

David Lindert

Xinyang Zhang

Luc Billot

Pascal Delprat

In one embodiment a system component in a content delivery network (CDN), the CDN including a request router and edge caches, the request router being operable to determine which edge cache should serve content to a client, the system competent including a processor, and a memory to store data used by the processor, wherein the processor is operative to receive a request for content from the client, and based on a decision to shut down a first edge cache after the client has already downloaded some of the content from the first edge cache, participate in a process to transfer the client from downloading the content from the first edge cache to downloading the content from a second edge cache in the middle of the client downloading the content so that the client continues downloading the content from the second edge cache. Related apparatus and methods are also described.

CDN scale down

In one embodiment, for each port of an access node in an access-based computer network, one access server of a plurality of access servers is configured as a preferred access server for that port. Upon receiving a session initiation message at a particular port, the access node forwards the session initiation message to one or more of the access servers based on the configured preferred access server for the particular port.

Deterministic session load-balancing and redundancy of access servers in a computer network

The embodiments described herein present methods and apparatuses for on-path CAC operations in a MPLS-VPN environment. In an example embodiment, an ingress PE device receives a quality of service (QoS) resource reservation request; constructs an outgoing message that includes information allowing an egress PE device to identify the virtual private network routing and forwarding table (VRF) associated with a resource reservation resulting from the QoS resource reservation request; and transmits the outgoing message to the egress PE device, where the information allowing VRF identification is echoed back by the egress PE device and used by the ingress PE device to identify the VRF associated with the resource reservation resulting from the QoS resource reservation request. Other embodiments are described.

Pure control-plane approach for on-path connection admission control operations in multiprotocol label switching virtual private networks

A method is provided in one example embodiment and includes identifying an Internet protocol (IP) address for a serving gateway; establishing a link between the serving gateway and a congestion notification element; monitoring packets in order to identify whether a differentiated services code point (DSCP) bit has been set in the packets; determining that a threshold associated with congestion in a network has been exceeded; and communicating a signal to the serving gateway associated with the congestion. The serving gateway can be configured to correlate the congestion with identifiers associated with end users operating in the network, where the serving gateway communicates a signal to a network element to reduce the congestion.

System and method for managing congestion in a network environment

In one embodiment, a node (e.g., a router) performs reservations for data flows, each on a corresponding selected (reserved) path having adequate reservation availability. Also, the node forwards data from data flows, each over a corresponding selected (forwarded) path having adequate load availability, wherein forwarded paths are decoupled from reserved paths for the data flows.

Efficiently decoupling reservation and data forwarding of data flows in a computer network

In one embodiment, a method that receives at a cache server device a request from a client device for a first representation of a content chunk; determines whether the first representation is available at the cache server device; responsive to determining that the first representation is available at the cache server device, provides the first representation to the client device; responsive to determining that the first representation is unavailable at the cache server device, determines whether a congestion-like condition is present in an upstream network; and responsive to determining that the congestion-like condition is present in the upstream network, provides a second representation of the content chunk.

Reducing fetching load on cache servers in adaptive streaming

In one embodiment, a set of tunnels is determined that traverse a particular link connected to an intermediate node in a network. The intermediate node computes, in a coordinated path computation, paths for tunnels of the set of tunnels that do not include the particular link. The coordinated path computation considers each of the tunnels of the set of tunnels. The intermediate node selects one or more tunnels of the set of tunnels for preemption. The one or more tunnels are selected as tunnels that are reroutable by respective head-end nodes of the one or more other tunnels. Notifications are sent to one or more other intermediate nodes that inform the one or more other intermediate nodes of the one or more tunnels selected for preemption.

Optimization of distributed tunnel rerouting in a computer network with path computation at an intermediate node

A method and apparatus for demoting network traffic are disclosed. In one embodiment, a method includes transmitting traffic associated with a session over a first path, and maintaining state information identifying the first path as a forwarding path for the session. Traffic associated with the session is rerouted from the first path to a second path following a network failure and the rerouted traffic is marked so that at least a portion of the rerouted traffic can be dropped at any point in the network if rerouting causes network congestion.

Network traffic demotion

A method is provided in one embodiment and includes establishing a video session involving an endpoint and a server; evaluating network criteria associated with characteristics that can affect a bit rate for the video session; and communicating bit rate hint data, which is based on the network criteria, to the endpoint for consideration in a bit rate request. The bit rate request involves streaming data in the video session. The method also includes receiving the bit rate request from the endpoint.

System and method for data streaming in a computer network

Methods and apparatus for enabling a layer 2 node associated with an open systems interconnection (OSI) reference model to perform resource reservation protocol (RSVP) processing are disclosed. According to one aspect of the present invention a layer 2 device associated with an OSI reference model includes a first interface, a processing arrangement, and a second interface. The first interface intercepts a message associated with a on-path signaling protocol for at least one selected from a group including resource reservation and admission control at a layer above layer 2. The processing arrangement processes the message, and the second interface sends the message.

Snooping of on-path IP reservation protocols for layer 2 nodes

In one embodiment, a node determines an overload ratio for an output as a ratio of a total rate of received traffic at the output to a preemption threshold of the output. The node also determines a ratio of traffic that is to be marked at the output based on the overload ratio and a ratio of previously marked traffic destined for the output from each input to the total traffic from each input to the output, and whether, for a particular input, the ratio of previously marked traffic is less than the ratio of traffic that is to be marked at the output. If so, the node marks unmarked traffic of the particular input corresponding to a difference between the ratio of traffic that is to be marked at the output and the ratio of previously marked traffic destined for the output from the particular input.

Control of preemption-based beat-down effect

In one embodiment, an apparatus includes a processor for mapping packets associated with network flows to policy profiles independent of congestion level at the apparatus, and enforcing the policy profiles for the packets based on a congestion state. Packets associated with the same network flow are mapped to the same policy profile and at least some of the network flows are protected during network congestion. The apparatus further includes memory for storing the policy profiles. A method for protecting network flows during network congestion is also disclosed.

Protection of network flows during congestion in a communications network

Growing community of inventors

Valbonne, France

Francois Le Faucheur