Method of forming routing data
First Claim
1. A method for forming routing information for a connection set-up, satisfying adjustable communications conditions, from a source switching node to a destination switching node, in a communications network having at least two subnetworks with switching nodes and connecting lines which connect the at least two subnetworks, subnetworks being connected to one another via connecting lines and topology information on the subnetwork to which the source switching node belongs, and at least on an interconnection of the subnetworks being stored so as to be available for said source switching node, comprising the steps of:
- selecting a subset of the switching nodes and connecting lines which satisfies the communications conditions and whose topology information is stored in the source switching node;
determining a route using elements of this set, which, in a direction from the source switching node to the destination switching node, leaves at least one subnetwork once and returns to said at least one subnetwork, and forming routing information from the route which has been determined.
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Accused Products
Abstract
Switching nodes of a communications network are assigned subnetworks and are interconnected to one another in any desired fashion. Stored in a source switching node is at least topology information on the node'"'"'s own subnetwork and on the interconnection of the subnetworks. In addition, the source switching node is provided with the communications conditions which are required for the communications link to be set up. By reference to the topology information, a subset of switching nodes and connecting lines which satisfies the communications conditions is selected and a route to the destination switching node is determined. Included in this process is a route which, in the direction from the source switching node to the destination switching node, leaves at least one subnetwork once and returns to the subnetwork again in the further course of the route. The routing information is then formed from the route which has been determined.
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Citations
10 Claims
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1. A method for forming routing information for a connection set-up, satisfying adjustable communications conditions, from a source switching node to a destination switching node, in a communications network having at least two subnetworks with switching nodes and connecting lines which connect the at least two subnetworks, subnetworks being connected to one another via connecting lines and topology information on the subnetwork to which the source switching node belongs, and at least on an interconnection of the subnetworks being stored so as to be available for said source switching node, comprising the steps of:
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selecting a subset of the switching nodes and connecting lines which satisfies the communications conditions and whose topology information is stored in the source switching node;
determining a route using elements of this set, which, in a direction from the source switching node to the destination switching node, leaves at least one subnetwork once and returns to said at least one subnetwork, and forming routing information from the route which has been determined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification