Method and apparatus for scaling traffic engineering routing in a network
First Claim
1. A method for scaling Traffic Engineering, TE, routing in a network, comprising a plurality of network elements (nodes) connected in a given layer to each other via links,wherein contiguous TE domain segments, TE-SEGs, of a TE domain of said network are collapsed into virtual TE nodes, VN, each having an allocated TE domain unique identifier, VNID, and a detailed connectivity matrix, DCM, to provide a hierarchically virtualized network topology of said network,wherein a TE domain segment, TE-SEG, is selected by a network operator as an arbitrary contiguous part of the TE domain, and is collapsed into at least one virtual TE node, VN, representing the selected TE domain segment, TE-SEG,wherein the virtual TE node, VN, collapsing is achieved by reconfiguring the TE links, connecting the selected TE domain segment, TE SEG, with the rest of the TE domain, thus forming VN access links, ALs, as well as all of the TE domain segment TE links, thus forming VN internal TE links, ILs, in such a way, that the AL advertisements flooded across the TE domain represent said TE domain segment, TE-SEG, to the remaining part of the TE domain as at least one virtual TE node, while the IL advertisements are contained within the respective VN(s) and are not leaked into said TE domain.
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Abstract
A method for scaling traffic engineering, TE, routing in a network, having a plurality of network elements (nodes) connected in a given layer to each other via links TE domain segments of a TE domain of said network are collapsed into a virtual TE nodes (VNs). Each VN having an allocated DE domain unique identifier and a detailed connectivity matrix, DCM, to provide a hierarchically virtualized network topology of the network.
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Citations
13 Claims
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1. A method for scaling Traffic Engineering, TE, routing in a network, comprising a plurality of network elements (nodes) connected in a given layer to each other via links,
wherein contiguous TE domain segments, TE-SEGs, of a TE domain of said network are collapsed into virtual TE nodes, VN, each having an allocated TE domain unique identifier, VNID, and a detailed connectivity matrix, DCM, to provide a hierarchically virtualized network topology of said network, wherein a TE domain segment, TE-SEG, is selected by a network operator as an arbitrary contiguous part of the TE domain, and is collapsed into at least one virtual TE node, VN, representing the selected TE domain segment, TE-SEG, wherein the virtual TE node, VN, collapsing is achieved by reconfiguring the TE links, connecting the selected TE domain segment, TE SEG, with the rest of the TE domain, thus forming VN access links, ALs, as well as all of the TE domain segment TE links, thus forming VN internal TE links, ILs, in such a way, that the AL advertisements flooded across the TE domain represent said TE domain segment, TE-SEG, to the remaining part of the TE domain as at least one virtual TE node, while the IL advertisements are contained within the respective VN(s) and are not leaked into said TE domain.
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8. An apparatus for scaling Traffic Engineering, TE, routing in a network comprising a plurality of network elements (nodes) connected in a given network layer to each other via links, is adapted to collapse selected by the operator arbitrary contiguous TE domain segments, TE-SEGs, of a TE domain of said network into virtual TE nodes, VNs, each having an allocated TE domain unique identifier, VNID, and a detailed connectivity matrix, DCM, to provide a hierarchically virtualized network topology of said network,
wherein a contiguous TE domain segment, TE-SEG, is selected by a network operator and collapsed into at least one virtual TE node, VN, representing said TE-SEG by reconfiguring access TE links, ALs, connecting the TE-SEG with the remaining part of said TE domain such that the ALs advertise the TE domain unique identifier(s), VNID(s), of the respective virtual TE nodes, VNs, as local node identifiers.
Specification