| Patent application number | Description | Published |
|---|
| 20090161531 | INTELLIGENT DATABASE EXCHANGE FOR OSPF - The present invention relates to systems and methods for eliminating unnecessary link state database exchanges and processes when two OSPF routers are forming a full adjacency. In particular, the invention provides methods and mechanisms for deducing information about unreachable routers from link state changes received, recording the information about the unreachable routers for a given period of time, constructing a neighbor database summary list that does not contain the LSAs that the neighbor has through using the information about the unreachable routers and reachable routers, and determining whether the neighbor router is restarted after it becomes unreachable. In addition, the present invention provides a few of options to deduce and use the information about the unreachable routers and the information in the link state database for eliminating unnecessary link state database exchanges and processes. | 06-25-2009 |
| 20090245253 | Computing Point-to-Multipoint Paths - An apparatus comprising a path computation element (PCE) configured to communicate with a path computation client (PCC) and compute a point-to-multipoint (P2MP) path across an autonomous system (AS) domain. Also included is a network component comprising at least one processor configured to implement a method comprising obtaining a computation request for a P2MP path across a plurality of AS domains, attempting to calculate the P2MP path across the AS domains, thereby generating a computed path or a failure reason, and transmitting a reply comprising the computed path or an indication of the failure reason. Included is a method comprising exchanging a request message and a reply message about a P2MP path across an AS domain between a PCC and a PCE. | 10-01-2009 |
| 20090252058 | Multi-Protocol Label Switching Multi-Topology Support - A network component comprising at least one processor configured to implement a method comprising receiving a packet, determining whether the packet comprises a topology label, and adding the topology label to the packet if the packet does not comprise the topology label. Included is a method comprising routing a plurality of packets corresponding to a plurality of forwarding equivalence classes (FECs) over a plurality of network topologies using a topology label and plurality of forwarding labels for each network topology. Also included is a network comprising a plurality of nodes in communication with each other and having a plurality of network topologies, wherein at least some of the nodes are configured to route data packets for a plurality of FECs along a path in each network topology using a topology label corresponding to each network topology and an inner label corresponding to each FEC. | 10-08-2009 |
| 20090274066 | SYSTEMS AND METHODS FOR IMPLEMENTING MULTI-TOPOLOGY SUPPORT FOR LABEL DISTRIBUTION PROTOCOL (LDP) OF A MULTIPROTOCOL LABEL SWITCHING NETWORK - System and method for support multiple topology in Label Distribution Protocol of Multi-Protocol Label Switching (MPLS) network are disclosed. The system includes a number of network elements and a communication mechanism used to connect the network elements. The network elements discover LDP peers within the network topology, and create and maintain LDP sessions for each of the network topologies. The network elements further establish LSPs by mapping network layer routing information within each network topology to data link layer switches paths. Furthermore, the communication mechanism enables the network elements to advertise the multi-topology capability and exchange the mapping information of label and FECs within each network topology. | 11-05-2009 |
| 20090303904 | System and Method for Multi-Topology Support - A system and method for providing multi-topology support in RSVP-TE in a multi-protocol label switching network is provided. A method includes reserving path states for a traffic engineered label switched path (TE LSP), and releasing the reserved path states. The TE LSP is established within a single network topology in an environment of multiple network topologies, and the reserving path states includes sending a first resource reservation protocol with traffic engineering (RSVP-TE) message containing multi-topology information. | 12-10-2009 |
| 20100177631 | Protecting Ingress and Egress of a Label Switched Path - An apparatus comprising a backup node coupled to an ingress node of a point-to-multipoint (P2MP) label switched path (LSP) and to a plurality of next-hop nodes of the ingress node of the P2MP LSP via a backup tree, wherein the backup node and the ingress node are both coupled to an external node, and wherein the backup node is configured to ensure data delivery in the P2MP LSP when the ingress node fails. Included is a network component comprising at least one processor configured to implement a method comprising detecting a failure in an ingress node of a P2MP LSP, receiving a data packet destined for the ingress node and to be transported by the P2MP LSP from a provider node when the ingress node fails, and transmitting the data packet on a backup tree that merges with the P2MP LSP prior to reaching an egress node. | 07-15-2010 |
| 20100208733 | System and Method for Point to Multipoint Inter-Domain Multiprotocol Label Switching Traffic Engineering Path Calculation - A system comprising a plurality of path computation elements (PCEs) configured to communicate with an ingress node, jointly compute a core tree for an inter-domain point-to-multipoint (P2MP) tree across a plurality of network domains, and independently compute a plurality of sub-trees in at least some of the network domains, wherein the core tree connects the ingress node to a boundary node (BN) in each one of the network domains that have a destination node and each sub-tree connects the BN to a plurality of destination nodes in one of the network domains that have a destination node. | 08-19-2010 |
| 20110199891 | System and Method for Protecting Ingress and Egress of a Point-to-Multipoint Label Switched Path - A network comprising a first edge node, a second edge node, a third edge node that backs up either the first edge node or the second edge node, and an internal node coupled to the first edge node, the second edge node, and the third edge node, wherein a point-to-multipoint (P2MP) label switched path (LSP) extends across the network from the first edge node, through the internal node, and to the second edge node, and wherein a LSP sub-tree extends between the third edge node and the internal node, but does not extend across the network. | 08-18-2011 |
