A method (400) for providing support for elasticity within a domain of a multi-domain network. The method comprises receiving (401) information for a requested virtual link forming part of an end-to-end path across the multi-domain network; wherein the information of the virtual link comprises a service parameter and an elasticity parameter. The method further comprises selecting (402) a physical path (150) corresponding to the virtual link on which to send traffic. The physical path is selected based on a service parameter and an elasticity parameter of the physical path.

A wind turbine having a Controller Area Network communication system is provided. Electrical and/or electronic components of the wind turbine are coupled to CAN nodes. The communication system has a plurality of CAN nodes. At least one CAN distributor unit is coupled via a first communication segment to one of the plurality of CAN nodes and via a second communication segment to at least one further CAN distributing unit. The CAN distributor units are designed to carry out a data communication via the first communication segment on the basis of a first CAN protocol which represents a standard CAN protocol, and to carry out a data communication via a second communication segment on the basis of a second CAN protocol which is different from the standard CAN protocol.

Web-enabled routers are remotely and securely administered in a centralized fashion. A router receives a configuration profile from a dedicated web domain that maintains a repository of configuration profiles for multiple routers. The web domain also provides a web portal for customized generation of new configuration profiles based on stored profiles. When a new profile is deployed to and instantiated on a router, the router transmits a “heartbeat” to ensure that it can maintain connectivity with the web domain; if not, the router reverts to a previous “failover” configuration profile that ensures connectivity to the web domain. A router also may be equipped with both a wired and a wireless (e.g., a 3G, 4G, or 4G LTE) WAN communication interface. In the event of a wired connectivity issue, the router controls the wireless WAN interface to prioritize traffic for the router heartbeat and data backup/restore operations between a computer network for which the router serves as a gateway and the web domain.

Web-enabled routers are remotely and securely administered in a centralized fashion. A router receives a configuration profile from a dedicated web domain that maintains a repository of configuration profiles for multiple routers. The web domain also provides a web portal for customized generation of new configuration profiles based on stored profiles. When a new profile is deployed to and instantiated on a router, the router transmits a “heartbeat” to ensure that it can maintain connectivity with the web domain; if not, the router reverts to a previous “failover” configuration profile that ensures connectivity to the web domain. A router also may be equipped with both a wired and a wireless (e.g., a 3G, 4G, or 4G LTE) WAN communication interface. In the event of a wired connectivity issue, the router controls the wireless WAN interface to prioritize traffic for the router heartbeat and data backup/restore operations between a computer network for which the router serves as a gateway and the web domain.

In an example, a network device may receive a L3VPN packet of which an egress label edge router (LER) is the network device, and acquire an adjacency index of an adjacency entry in an adjacency table according to the destination IP address of the inner IP datagram from the L3VPN packet. The network device may acquire a PW extended index of a PW extended entry in a PW extended table and a private network layer-2 header for the inner IP datagram from an adjacency entry having the adjacency index. By using the private network layer-2 header and a public network label, a private network label and a public network layer-2 header in a PW extended entry having the PW extended index, the network device may encapsulate the inner IP datagram into a L2VPN packet and forward the L2VPN packet through a physical egress interface in the PW extended entry.

For logical multicasting in overlay networks, at a data processing system, an original unicast packet is received from a first component in a first computing node in an overlay network. To cause multicasting in the overlay network the received original unicast packet was unicast by the first computing node only to the data processing system, and a multicast data structure for the overlay network is maintained only by the data processing system, the multicast data structure containing information of each receiver that is configured to receive unicast packets during logical multicasting in the overlay network. From a set of subscriber receivers in the multicast data structure, a subset of the subscriber receivers is selected. A copy of the original unicast packet is unicast to each subscriber receiver in the subset.

A network device is configured to provide, via an Ethernet segment with a customer network, active-active multi-homing L2 virtual bridge connectivity to the customer network using an EVPN instance (EVI) and L3 routing using an IRB interface that is a L3 routing interface assigned to the EVI; to receive, from a peer PE device of the EVPN instance, an EVPN route comprising an L2-L3 binding for a customer device of the customer network and associating the L2-L3 binding with the Ethernet segment, the L2-L3 binding comprising an L2 and an L3 address assigned to the customer device, wherein the peer PE device provides, with the network device and via the Ethernet segment, active-active multi-homing L2 virtual bridge connectivity to the customer network; and to forward, via the Ethernet segment and based at least on the L2-L3 binding received from the peer PE device, an L3 packet to the customer device.

Techniques are described for automatic discovery of two or more virtual service instances configured to apply a given service to a packet in a software-defined networking (SDN)/network functions virtualization (NFV) environment. Virtual service instances may be deployed as virtual entities hosted on one or more physical devices to offer individual services or chains of services from a service provider. The use of virtual service instances enables automatic scaling of the services on-demand. The techniques of this disclosure enable automatic discovery by a gateway network device of virtual service instances for a given service as load balancing entities. According to the techniques, the gateway network device automatically updates a load balancing group for the given service to include the discovered virtual service instances on which to load balance traffic for the service. In this way, the disclosed techniques provide auto-scaling and auto-discovery of services in an SDN/NFV environment.

A control apparatus, includes a first unit configured to be capable of specifying an identification rule to identify a packet based on a user of a virtual network including a plurality of virtual nodes; and a second unit configured to be capable of sending an instruction to a physical node corresponding to each of the virtual nodes of the virtual network, wherein each of the virtual nodes includes a predetermined network function being capable of providing a first packet operation to the packet, wherein the instruction includes that the physical node provides a second packet operation to the packet so as to emulate the first packet operation.

One embodiment of the present invention provides a switch system. The switch includes a port that couples to a server hosting a number of virtual machines. The switch also includes a link tracking module. During operation, the link tracking module determines that reachability to at least one end host coupled to a virtual cluster switch of which the switch is a member is disrupted. The link tracking module then determines that at least one virtual machine coupled to the port is affected by the disrupted reachability, and communicates to the server hosting the affected virtual machine about the disrupted reachability.