Network restoration
First Claim
Patent Images
1. A method of determining an alternative route for a communication between nodes in a network, following failure of part of the network, the network comprising a plurality of nodes, and links between the nodes, the method comprising the steps of:
- determining a plurality of possible alternative routes around the failed part and having any spare capacity;
passing messages between nodes along the possible alternative routes to gather information relating to an amount of spare capacity of each link in the possible alternative routes; and
selecting the alternative route for the communication from said possible alternative routes on the basis of at least the gathered link spare capacities.
13 Assignments
0 Petitions
Accused Products
Abstract
For restoration of a network a plurality of possible alternative routes are determined. Messages are passed between nodes along the alternative routes to determine a spare capacity of each link in the alternative routes. An alternative route is selected from the possible alternative routes on the basis of a database of the determined link spare capacities for each of the possible alternative routes, built up at a chooser node at one side of the failed part of the network.
-
Citations
24 Claims
-
1. A method of determining an alternative route for a communication between nodes in a network, following failure of part of the network, the network comprising a plurality of nodes, and links between the nodes, the method comprising the steps of:
-
determining a plurality of possible alternative routes around the failed part and having any spare capacity; passing messages between nodes along the possible alternative routes to gather information relating to an amount of spare capacity of each link in the possible alternative routes; and selecting the alternative route for the communication from said possible alternative routes on the basis of at least the gathered link spare capacities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 22)
-
-
16. A method of providing alternative routes for multiple concurrent communications between nodes in a network, following failure of a part of the network affecting the multiple communications, the network comprising a plurality of nodes, and links between the nodes, the method comprising the steps of:
-
determining the route has failed; determining alternative routes around the failed part; selecting at least one of the nodes in the vicinity of the failed part, as a chooser node; determining an amount of spare capacity on the alternative routes, and using the chooser node to control allocation of the determined spare capacity on the alternative routes to the multiple concurrent communications.
-
-
17. A network comprising:
a plurality of nodes and links connecting the nodes, for passing information along a route set up across the network via the nodes, the network further comprising; means for determining a plurality of possible alternative routes having any spare capacity in the event of failure of part of the network; means for passing messages along the possible alternative routes to determine an amount of spare capacity of each link in the alternative routes; and means for selecting one of the possible alternative routes on the basis of the determined link spare capacities. - View Dependent Claims (24)
-
18. A node for a network, the network comprising a plurality of such nodes, interconnected by links, for passing information along a route set up across the network, the node comprising:
-
means for determining a plurality of possible alternative routes having any spare capacity for use in the event of failure of part of the network and; means for passing messages along the possible alternative routes to gather information relating to the spare capacity of each link in the possible alternative routes; and means for receiving information relating to the spare capacity of each link in the possible alternative routes, and selecting at least one of the alternative routes on the basis of the received information.
-
-
19. Apparatus for determining an alternative route for a communication between nodes in a network, following failure of part of the network, the network comprising a plurality of nodes, and links between the nodes, the network being arranged to determine plurality of possible alternative routes having sufficient spare capacity around the failed part for the communication the apparatus comprising;
-
circuitry for receiving messages from nodes along the possible alternative routes, the messages comprising an indication of an amount of spare capacity of the links in the possible alternative routes; and circuitry for selecting the alternative route for the communication from the possible alternative routes on the basis of at least the amounts of spare capacity of the links. - View Dependent Claims (20, 21)
-
-
23. Software for a node of a network, the network comprising a plurality of such nodes, interconnected by links, for passing information along a route set up across the network. The network being arranged to determine a plurality of possible alternative routes for use in the event of failure of part of the network, the software being arranged to carry out the steps of;
-
receiving messages from nodes along the possible alternative routes, the messages comprising an indication of an amount of spare capacity of the links in the possible alternative routes; and selecting the alternative route for the communication, from the possible alternative routes, on the basis of at least the link spare capacities.
-
Specification