Abstract: In a message delivery system, wherein messages are published by publishers and delivered to subscribers based on subscriptions relating to message content. A last message queue is associated with each publisher, and a last message from each publisher is stored in the message queue associated with that publisher based on an attribute of the publisher. In this way, it is not necessary to modify the content data within the message to create the last message queue.

Abstract: A method of managing shared resources for controlling message flows in an assured message delivery system having a plurality of clients involves identifying different classes of clients based on their performance behaviors, and providing differentiated access to said shared resources between said different classes of clients.

Abstract: In a message delivery system, messages are published by publishers and delivered to subscribers based on subscriptions relating to message content. Activation and de-activation notifications are supplied to applications that are bound to a queue in the message delivery system.

Abstract: In a message delivery system, messages are carried over a network in packets. Server hosts support applications for originating and receiving messages and network interfaces. Switches interconnect the server hosts and form the packet network. Some of the switches are linked to the local server hosts. Distributed filtering/matching modules associated with the local server hosts register interests for applications on the associated local server hosts, inspect packets received over the network or from a local server host to match messages with registered interests and remove any unmatched packets from the packets. The matched messages are forwarded to the local server host for delivery to the applications. This system offers the ability to use special purpose hardware for the filtering/matching function without requiring connections to a common message broker.

Abstract: An assured message delivery system with resiliency receives messages from publishing client(s) and delivers them to subscribing clients. A primary system delivers the messages during normal operation. A secondary system mirroring the configuration of the primary system takes over responsibility for delivering the messages in the event of failure of the primary system. The secondary system is connected to the primary system over a communications link. The primary system sends copies of the messages to the secondary system over the communications link. The secondary system stores replicate messages and sends acknowledgement messages back to the primary system.

Abstract: A method of propagating multicast subscription and routing information between routers in a network, and constructing forwarding tables in the routers, allowing providers of the data (the publishers), and the multicast recipients of the data (the subscribers) to be decoupled from and have no knowledge of one another. This is done without the need to maintain (Source Network, Published-Multicast-Group) State in the routers, for a highly scalable solution in those applications where there is a possibility for a large, or infinite number of Published-Multicast-Groups, and in those applications where messages are being routed by content, so it is impossible to identify published-multicast-groups.

Abstract: A method of propagating multicast subscription and routing information between routers in a network, and constructing forwarding tables in the routers, allowing providers of the data (the publishers), and the multicast recipients of the data (the subscribers) to be decoupled from and have no knowledge of one another. This is done without the need to maintain (Source Network, Published-Multicast-Group) State in the routers, for a highly scalable solution in those applications where there is a possibility for a large, or infinite number of Published-Multicast-Groups, and in those applications where messages are being routed by content, so it is impossible to identify published-multicast-groups.

Abstract: In method of providing assured message delivery across a distributed message delivery system with low delivery latency and network traffic, a set of destinations is first identified for a set of destinations for a message received at an ingress router to the network. The received message is stored in persistent storage along with meta-data about each destination for the message before the message is routed to each identified destination. The message is only removed from persistent storage when an acknowledgement has been received from each destination indicating that the message has been successfully received.

Abstract: A networking appliance includes a chassis, an off-the-shelf motherboard mounted on said chassis, said motherboard including at least one expansion bus, one or more separately removable expansion module mounted on said chassis, and a number of card slots in the expansion module for accommodating expansion cards. A connection arrangement provides a signal connection between the card slots in the expansion modules and the expansion buses.

Abstract: In source routed or hop-by-hop routed protocol communication networks, when congestion is detected at a certain network element, a notification message is sent to nodes. The nodes keep track of congestion condition and generally have knowledge of the congestion, thereby allowing them to make more intelligent routing decisions, i.e., rate controlling messages, routing traffic around congestion, regulating admission at the edge of the network. The intelligent routing decision is based on the congestion condition indicated by a restriction level which is periodically and dynamically updated.

Abstract: A method of performing connectivity verification in a content routed network including a plurality of routers and wherein messages are transported through the network over a message transport layer, involves sending from an originating router a ping request message over the message transport layer along a user data path to a terminating router using a content routing protocol. The terminating router responds with a ping reply message upon receipt of the ping request message, and the message transport layer is monitored for the ping reply message at the originating router. Trace messages can also be sent through the network to determine whether subscribers are reachable for messages originating from a particular publisher. Also trace messages can be sent through the network to determine whether subscriptions from a particular subscriber are reachable from a particular originating router.

Abstract: A method of managing a content routed network, involves distributing published documents through said network for delivery to subscribers; maintaining data logs pertaining to said published documents at different points in the network; and correlating the data logs to obtain information about the operation of the network.

Abstract: A method of providing a shared application infrastructure simultaneously to multiple independent virtual private networks with potentially overlapping IP addresses, involves connecting to an underlying layer 1, 2 or 3 virtual private network offering one or more virtual private networks, determining which virtual private network traffic is being received from or sent into, maintaining logically separate routing tables per VPN to allow overlapping addresses, and providing an application which provides a logical instance of the service to each VPN.

Abstract: A method of providing router redundancy within a distributed network of routers, wherein messages are routed within the network based on virtual router identifiers, involves organizing the routers into one or more redundancy groups; assigning a physical identifier to each router in each of the redundancy groups; assigning one or more virtual identifiers to each redundancy group; selecting one of the routers of a particular redundancy group as a currently active router associated with a particular virtual identifier assigned to that redundancy group; advertising among the distributed network of routers for each redundancy group the physical identifier for the active router and information enabling other routers to determine the virtual identifier with which the currently active router is associated; and forwarding messages destined for a particular virtual router identifier to the currently active router based on the physical identifier of the currently active router.

Abstract: In a method of managing a content-based network, which is typically XML-based, and optionally may be overlaid on an underlying network having a plurality of network elements interconnected by links, a link state protocol maintains each network element's topological view of the overlay network from the underlying network. A subscription management protocol ensures dissemination of published content within the content-based network independently of the link state protocol.

Abstract: In a method of performing the asynchronous delivery of messages from a server to a client, the server receives the messages for the client from a message source. The server and client communicate over a packet network using an asymmetric protocol that requires request messages to be originated from the client to the server. At least one request message is sent in advance from the client to the server, and these request messages are stored at the server. When the server receives a message for the client from the message source, it forwards the message to the client as a response to a stored request message.

Abstract: A method and apparatus for emulating VPLS within an ATM network. Provider Edge devices are configured for VPLS connections. For each pair of provider edge devices supporting the same VPLS ID, one device establishes a virtual circuit between the pair. Thus, a full mesh of virtual circuits is established between provider edge devices, and a VPLS-like service can be offered to users without having to implement MPLS. Establishing the virtual circuits within a PNNI hierarchy maybe facilitated by each provider edge device propagating through the hierarchy an information group containing an association between the ATM address of the device and a VPLS ID, so that each provider edge device learns all ATM addresses to be associated with each VPLS ID. The method of advertising ATM addresses can be applied to other services requiring a number of interconnections between provider edge devices, such as Virtual Private Networks.

Abstract: The present invention provides a method for permitting fully detailed advertising of reachability information for some addresses in a network while efficiently summarizing reachability information for other addresses. At least one embodiment is implemented as part of a process used by logical nodes for advertising reachability information for members of a group of nodes represented by the logical node. At least one embodiment provides an “exception” instruction that allows detailed reachable address information to be advertised for an address that would otherwise be included in summary address information. At least one embodiment allows detailed reachability information to be advertised for the particular address while still allowing summarization of reachable address information for addresses sharing a common prefix with the “exception” address.

Abstract: A method of providing assured message delivery with low latency and high message throughput, in which a message is stored in non-volatile, low latency memory with associated destination list and other meta data. The message is only removed from this low-latency non-volatile storage when an acknowledgement has been received from each destination indicating that the message has been successfully received, or if the message is in such memory for a period exceeding a time threshold or if memory resources are running low, the message and associated destination list and other meta data is migrated to other persistent storage. The data storage engine can also be used for other high throughput applications.

Abstract: The invention provides a system and method of a selecting an egress connection from egress connections at a node for a call being established in a network along a path being associated with the node. Each connection has sufficient bandwidth to carry the call and terminates at a same destination point in said path. The system and method comprise utilizing at least a bandwidth load balance value for each connection in a set of the connections to select the egress connection from the set. An administrative factor score may be used to further define members of the set.