Failure restoration system suitable for a large-scale network
First Claim
1. A failure restoration system comprising distributed hierarchical routing means capable of exchanging, in a distributed and hierarchical manner, link state parameters between nodes in a connection-oriented network having a plurality of subnetworks, the link state parameter including information about a bandwidth of a link and delay to discover a hierarchical topology, the routing means being adapted to set up a main path and previously determine an alternate path for the main path, wherein:
- the failure restoration system further comprises alternate path selection means adapted to obtain complete source route information for the main path when it attempts to set up the main path, said alternate path selection means adding the complete source information to a SETUP signaling message for setting up the alternate path, thereby providing said alternate path as much different as possible from the main path.
1 Assignment
0 Petitions
Accused Products
Abstract
In a failure restoration system comprising a distributed hierarchical routing section which is adapted to set up a main path and previously determine an alternate path for the main path in a network, an alternate path selection section is adapted to obtain complete source route information for the main path when it attempts to set up the main path. The alternate path selection section adds the complete source information to a SETUP signaling message for setting up the alternate path, thereby provides a physical alternate path as much different as possible from the main path.
145 Citations
10 Claims
-
1. A failure restoration system comprising distributed hierarchical routing means capable of exchanging, in a distributed and hierarchical manner, link state parameters between nodes in a connection-oriented network having a plurality of subnetworks, the link state parameter including information about a bandwidth of a link and delay to discover a hierarchical topology, the routing means being adapted to set up a main path and previously determine an alternate path for the main path, wherein:
the failure restoration system further comprises alternate path selection means adapted to obtain complete source route information for the main path when it attempts to set up the main path, said alternate path selection means adding the complete source information to a SETUP signaling message for setting up the alternate path, thereby providing said alternate path as much different as possible from the main path. - View Dependent Claims (2)
-
3. A failure restoration system comprising distributed hierarchical routing means capable of exchanging, in a distributed and hierarchical manner, link state parameters between nodes in a connection-oriented network having a plurality of subnetworks, the link state parameters including information about a bandwidth of a link and delay to discover a hierarchical topology, the routing means being adapted to set up a main path and previously determine an alternate path for the main path, wherein:
the failure restoration system further comprises alternate path selection means adapted to flood a combination of hierarchical source route information for the main path assigned for each subnetwork and a unique connection ID for identification of the main path throughout the network, among all nodes other than the flooding source node within the same subnetwork for each subnetwork on the main path when it attempts to set up the main path, said alternate path selection means also being adapted to add the connection ID of the main path to a SETUP signaling message for setting up the alternate path, thereby providing said alternate path as much different as possible from the main path. - View Dependent Claims (4)
-
5. A failure restoration system comprising distributed hierarchical routing means capable of exchanging, in a distributed and hierarchical manner, link state parameters between nodes in a connection-oriented network having a plurality of subnetworks, the link state parameters including information about a bandwidth of a link and delay to discover a hierarchical topology, wherein:
each node comprises alternate path selection means that floods or advertises, among other nodes, the link state parameters with the addition of a reliability factor obtained depending on a degree of reliability of nodes/links, thereby selecting a route based on the reliability factor. - View Dependent Claims (6, 7, 8, 9, 10)
Specification