TECHNIQUE FOR DETERMINING A POINT-TO-MULTIPOINT TREE LINKING A ROOT NODE TO A PLURALITY OF LEAF NODES
First Claim
1. A method of determining a point-to-multipoint tree connecting a root node to a plurality of leaf nodes, at least some of the nodes being in different domains, executed by a path calculation entity associated with a domain known as the current domain, said method comprising steps of:
- receiving from at least one other path calculation entity associated with a domain downstream of the current domain at least one message comprising a first set of identifiers comprising at least one identifier of a bunch of branches comprising at least one branch and a respective cost associated with said bunch, the bunch comprising at least one branch making it possible to connect to leaf nodes in downstream domains; and
determining at least one new bunch of branches comprising at least one branch as a function of said at least one first set received, said new bunch of branches having a minimum cost and making it possible to connect also to the leaf nodes of the current domain if necessary.
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Abstract
A method is provided for determining a point-to-multipoint tree connecting a root node to a plurality of leaf nodes (some nodes in different domains) used by a path calculation entity associated with a current domain. The method comprises receiving from at least one other path calculation entity associated with a downstream domain at least one message including a first set of identifiers including at least one identifier of a bunch of branches comprising at least one branch and a respective cost associated with said bunch, the bunch comprising at least one branch enabling connection to leaf nodes in downstream domains, and determining at least one new bunch of branches comprising at least one branch as a function of said at least one first set received, said new bunch of branches having a minimum cost and making it possible also to contact the leaf nodes of the current domain.
103 Citations
10 Claims
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1. A method of determining a point-to-multipoint tree connecting a root node to a plurality of leaf nodes, at least some of the nodes being in different domains, executed by a path calculation entity associated with a domain known as the current domain, said method comprising steps of:
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receiving from at least one other path calculation entity associated with a domain downstream of the current domain at least one message comprising a first set of identifiers comprising at least one identifier of a bunch of branches comprising at least one branch and a respective cost associated with said bunch, the bunch comprising at least one branch making it possible to connect to leaf nodes in downstream domains; and determining at least one new bunch of branches comprising at least one branch as a function of said at least one first set received, said new bunch of branches having a minimum cost and making it possible to connect also to the leaf nodes of the current domain if necessary. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A path calculation entity associated with a domain, called the current domain, for determining a point-to-multipoint tree connecting a root node to a plurality of leaf nodes, at least some of the nodes being in different domains, said entity comprising means for:
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receiving at least one message comprising a first set of identifiers comprising at least one identifier of a bunch of branches comprising at least one branch and a respective cost associated with said bunch from at least one other path calculation entity associated with a domain downstream of the current domain, the bunch of branches comprising at least one branch making it possible to connect to leaf nodes in downstream domains; and determining at least one new bunch of branches comprising at least one branch as a function of said at least one first set received, said new bunch of branches having a minimum cost and making it possible to connect to the leaf nodes of the current domain, if necessary. - View Dependent Claims (7, 8)
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10. A signal sent by a path calculation entity associated with a domain, said signal bearing a message comprising a set of identifiers comprising at least one identifier of a bunch of branches comprising at least one branch and a respective cost associated with said bunch, the bunch of branches comprising at least one branch making it possible to connect to leaf nodes in domains downstream of the domain and in said domain, if necessary.
Specification