A system for setting expressions at an agent including a processor configured to receive a SNMP message from a management station specifying objects for notifications supported by the agent and expressions based on the objects, set expressions for the notification, evaluate expressions when the notification containing the expression is generated, and send the notification to the management station.

Truly random numbers are generated with a minimum of extra hardware by taking advantage of the inherent noise in a communication channel. Random numbers can thus be generated without specialized manufacturing requirements and can be incorporated to conventional integrated circuits with minimal additional logic. The random number generation technique offloads the processor from performing extensive generation calculations without the use of the hardware accelerator. This random number generation ...

Methods and apparatus for caching information associated with packets are disclosed. According to one aspect of the present invention, a system for processing a packet includes a controller with a processor and a controller data cache, a bus, a memory interface, and a separate data cache. The memory interface may be accessed by the controller via the bus, and is arranged to be in communication with a substantially external memory. The separate data cache, which is also in communication with the ...

A method for providing BGP route updates in an MPLS network is disclosed. The route update is performed at a router having a forwarding information table containing BGP routes and an internal label, and an adjacency table containing BGP/VPN labels and said internal label. The internal label corresponds to at least one IGP route and has an adjacency associated therewith. The method includes updating the adjacency associated with the internal label following an IGP route change.

Systems and methods for controlling power of WDM channels in a WDM receiver. A preamplifier is provided prior to a demultiplexer in the WDM receiver chain. The gain of the preamplifier may be controlled based on power measurements made on individual WDM channels. A filter with controllable tilt may be employed to compensate for amplifier gain tilt and assure that all of the WDM channels remain within the dynamic range of the photodetector and receiver electronics. This provides improved bit erro...

Systems and methods for implementing per-session load balancing of packets that increase traffic sharing and reduce systematic unequal distribution of traffic are provided by virtue of one embodiment of the present invention. A method for operating a selected router is provided that uses a load balancing algorithm that is configured to de-correlate distribution of sessions among the active paths at the selected router relative to distributions of sessions of other algorithms at other routers of ...

Load balancing enables the use of linear programming techniques to reduce the complexity of computing backup tunnel placement for guaranteed bandwidth protection. The ability to load balance among multiple backup tunnels transforms the placement problem into one that may be characterized as a series of linear constraints usable as input to a linear programming procedure such as the simplex method. Each node may compute its own backup tunnels and signal the tunnels to its neighbors with zero band...

Techniques for implementing forwarding in network devices are provided. Proxy addresses are used in place of next hop addresses so that a large routing table is not required. Pairs of proxy IP and MAC addresses can be used to allow this optimization to occur completely transparent to any other device in the network. One or more smaller tables can be utilized in place of a large routing table to more efficiently implement forwarding. Additionally, the technique can be utilized without requiring m...

Techniques for switching facilities in cross-connect systems are provided. Redundant line cards can determine line card path status and insert the path status into the associated data stream. A switch matrix can analyze the path status of the redundant line cards in hardware and switch the selected line card based on which line is providing the best performance. Additionally, consecutive path status information can be analyzed before switching line cards.

A method for defining hardware routing paths for networks having IP and MPLS paths generally comprises assigning a path ID for each path within a path group. The path ID for each path is an IP address and the path group contains all IP paths, all MPLS paths, or both IP and MPLS paths. The path ID for each MPLS path is a unique IP multicast address. The method further includes comparing all path IDs in each path group and assigning a common hardware resource to groups having matching path IDs.