Enhanced messaging is described to support status notifications regarding backup nodes of a data communications network. In one example, a status of a network node at the network node is monitored. The network node is coupled to a network. It is determined that the node is operating in a backup state, and a backup alive packet is sent through the network in response to determining that the node is operating in a backup state.

The problem of being unable to run microBFD using an IPv6 address over any member links of a layer 2 LAG when the LAG is DOWN (and its IPv6 address becomes or is TENTATIVE), is solved by running DAD for the address configured for the microBFD once the individual link is in DISTRIBUTING or STANDBY state and triggering (or starting) microBFD once the DAD for that address completes successfully. Further, member links of the LAG may be permitted to continue running microBFD even if the LAG interface is DOWN and even if some other member links (but not all member links) of the LAG are DOWN.

The present invention relates to a redundancy system of routing paths and method thereof. By establishing corresponding routing paths from different ports of routers in a ring network to a terminal in advance and transmitting the identical packet to the terminal by the different ports in the different routing paths simultaneously, the time of reestablishing the routing paths may be saved when one of the routing paths is broken, so as to improve the routing efficiency.

One embodiment of the present invention provides a switch. The switch includes a service management module and a packet processor. During operation, the service management module identifies a service provided by an appliance coupled to the switch via a local port. The packet processor constructs a notification message for a remote switch. The notification message includes information about the service and the appliance. In this way, the switch allows the remote switch to request the service.

A method by a first controller in a software defined networking (SDN) network for programming a switch in the SDN network to use a controller port as a watch port. The method includes generating an instruction for the switch to create a first group entry for a first group in a packet processing pipeline of the switch, where the first group entry includes a first bucket that specifies a first controller port as a watch port and an action for the switch to forward packets to the first controller via the first controller port, where the first controller port being specified as the watch port in the first bucket indicates that execution of the action specified by the first bucket is to be contingent upon a liveness of the first controller port and sending the instruction to the switch to cause the switch to create the first group entry.

This disclosure describes methods, devices, and systems related to routing packets over enterprise network sites. A method may be disclosed for routing packets between hosts at a first site and hosts at a second site in a network using a firewall. The method may comprise receiving a request, in a first packet, from a first router to send one or more packets to two or more hosts at the second site. The method may comprise receiving a first sub-network prefix, in a route advertisement, corresponding to two or more hosts at the first site from the first router, and receiving a first community value, in a first advertisement, associated with the first sub-network prefix. The method may comprise generating a first local preference value based at least in part on the first community value. And the method may comprise sending the request, first sub-network prefix, and first local preference value to a second router, in a second advertisement.

A method for keeping remote connection, an electronic device, and a server are provided. After establishing a first network connection, the electronic device enters a power-saving state from an operation state. While operating in the power-saving state, a communication module of the electronic device continuously detects a keep-alive packet transmitted by the server via the first network connection. If an error of reception of the keep-alive packet occurs, the electronic device returns to the operation state from the power-saving state in response to a wake-up signal, so as to re-establish a second network connection between the electronic device and the server.

A content delivery method enabling a communication terminal to acquire a content held by a passing communication terminal with a lightened communication load between the communication terminals is provided as follows in the present invention. The content delivery method according to the present invention includes storing a content and a content holder list listing a content holder that holds the content, in a mutually associated manner, receiving an external signal, detecting a neighboring communication terminal, and outputting a terminal identifier of the neighboring communication terminal included in the external signal. The method further includes searching the content holder list in accordance with the terminal identifier, determining a content related to an unsearched content holder list as an unheld content, and outputting the unheld content as a transmitted content, with the terminal identifier as a destination terminal identifier. The method further includes creating, in accordance with the determination result, a content message including the transmitted content and the destination terminal identifier, with a local terminal identifier as a transmission terminal identifier, or a content list message including a content list of the transmitted content and the destination terminal identifier, with the local terminal identifier as a transmission terminal identifier, and transmitting the created message as a content information message to the neighboring communication terminal.

The described technology is generally directed towards a transport protocol for latency sensitive applications. The disclosed transport protocol is “semi-reliable” in that it allows for specification of an importance of data being transmitted, thereby allowing important data to be sent reliably, while other data can be dropped if necessary, e.g., under bad network conditions. A deadline can be specified for such other data, and if the other data cannot be sent prior to the deadline, it can be dropped. Furthermore, the disclosed transport protocol can allow for early discovery of network jitter. A client device can send regular acknowledgments which identify most recently received data packets as well as a number of “heartbeat transmissions” received at the client device. A server device can use the acknowledgments to discover and respond to jitter.

A method is disclosed comprising, checking, at a first node, for receipt of an advertisement message from a second node within an advertisement time interval (102), wherein the first node acts as a backup for the second node in a network. The method further comprises, in response to not receiving the advertisement message within the advertisement time interval (104), sending a probe message to the second node (106) and checking for a response to the probe message from the second node (108).