The present invention provides an active/standby data center that avoids the delay associated with a cached DNS entry to switch from the active data center to the standby data center. When the active data center becomes unavailable, the standby data center advertises the same address as the primary data center so the change over occurs quickly. When the IP address of the primary data center is no longer visible to the standby data center, the standby data center begins to advertise.

Disaster recovery for active-standby data center using route health and bgp

Routers balance network traffic among multiple paths through a network according to an amount of bandwidth that can be sent on an outgoing interface computed for each of the paths. For example, a router receives a link bandwidth for network links that are positioned between the first router and a second router of the network, and selects a plurality of forwarding paths from the first router to the second router. Upon determining that one of the network links is shared by multiple of the plurality of forwarding paths, the router computes a path bandwidth for each of the plurality of forwarding paths so as to account for splitting of link bandwidth of the shared network link across the multiple forwarding paths that share the network link. The router assigns packet flows to the forwarding paths based at least on the computed amount of bandwidth for each of the forwarding paths.

Path weighted equal-cost multipath

Apparatus, methods, and related data structures for validating a routing configuration in a communication system are disclosed. Routing information in a communication system is passively collected, illustratively from routing protocol advertisement messages. A routing configuration of the communication system is validated based on the collected routing information. Validation may involve comparing information associated with electronic addresses in an address space of the communication system with the collected routing information, and also or instead comparing an intended routing configuration with an explicit routing configuration, for example. A data structure may include information indicating an electronic address and information indicating a result of validating a routing configuration associated with the electronic address.

Routing configuration validation apparatus and methods

This invention is to enable appropriate routing based on transition prediction of network traffic. This routing control method includes: reading out predicted utilization transition data (e.g. utilization rate, or utilized bandwidth) associated with a received connection set-up request from a predicted utilization transition data storage storing said predicted utilization transition data for each resource (e.g. links between routers, or server) in a network in future; and selecting a resource satisfying a predetermined condition based on the read predicted utilization transition data. Thus, by using said predicted utilization transition data, an appropriate resource is identified in accordance with future time transition of the resource utilization rate, for example, and thereby, appropriate routing is possible. For example, when a link that a traffic volume will increase after a predetermined time exists, it is possible to judge that such a link is not used even when there are a lot of available bandwidths now.

Routing control method, apparatus and system

A topology view of a network is generated on a visual display of a computer system. The topology view includes subnet objects, network device objects, and interface objects within the network device objects. Network flow records are acquired from each device within the network. Separate network flow records acquired from different devices in the network are correlated together into a common network flow record. Each of the separate network flow records shares a common source address and a common destination address. The common network flow record specifies transmission path segments of a communication through the network. The common network flow is rendered in the visual display over the topology view of the network by displaying an arrow for each transmission path segment traversed by the communication through the network.

System and Method for Network Topology and Flow Visualization

A system and method identifies the costs to be assigned to each link in a network that can more evenly balance the utilization of links in the network.

System and method for identifying cost metrics for a network

A system and method identifies ranges of addresses that can be reallocated and/or split to cause traffic to be redirected in a network to reduce the utilization of the most utilized links in an autonomous system. The system and method then identifies the utilization of the autonomous system after the reallocation and/or split and reports on the differences of utilization pre- and post-split.

System and method for identifying addresses to modify and the effects thereof

A system and method allocates ranges of addresses that are reachable by more than one border router to one of the border routers capable of reaching those ranges of addresses and advertises those addresses as being reachable only by the border router to which each such range of addresses were assigned.

Method and apparatus for allocating traffic among routers on a computer network

A system and method identifies the costs to be assigned to each link in a network that can more evenly balance the utilization of links in the network

System and method for reporting traffic information for a network

A system and method enables the balancing of inter-AS traffic from a primary AS to a target AS by adding a virtual node in the primary AS that appears connected to the edge routers that advertise via (I)BGP the ability to forward communications the target AS, and modifying the (I)BGP messages reflected to the primary AS to indicate that only the virtual node may forward communications to the target AS.

Haobo Yu

Papers

System and method for identifying cost metrics for a network

System and method for identifying addresses to modify and the effects thereof

Method and apparatus for allocating traffic among routers on a computer network

System and method for reporting traffic information for a network

Method and system for causing intra-AS network traffic to be more evenly balanced