Quality-ensuring routing technique
AssigneeNEC Corporation
InventorNorihito Fujita
Life of this patent
Estimating the term…
Abstract
A routing information notifying method improving the efficiency of a network composed of an IP network including an ATM network is disclosed. A virtual circuit (VC) is initially established in the ATM network. The IP network is notified about link resource information of the ATM network in such a way that an alternative route to the virtual circuit in the ATM network is searched for and then the IP network is notified about a link resource of the alternative route found in the ATM network to ensure the required QoS.
Claims31
In a network composed of a connectionless network including a connection-oriented network, wherein at least two routers are connected to each other through a virtual circuit established in the connection-oriented network, a method for notifying the connectionless network about link resource information of the connection-oriented network, comprising the steps of:
- a) searching for an alternative route to the virtual circuit in the connection-oriented network;
- and
- b) notifying the connectionless network about a link resource of the alternative route found in the connection-oriented network.
In a network composed of a connectionless network including a connection-oriented network, wherein at least two routers are connected to each other through a virtual circuit established in the connection-oriented network, a method for notifying the connectionless network about link resource information of the connection-oriented network, comprising the steps of:
- a) determining whether a link resource of the virtual circuit satisfies required quality;
- b) notifying the connectionless network about only the link resource of the virtual circuit, when the link resource of the virtual circuit satisfies the required quality;
- c) searching for an alternative route to the virtual circuit in the connection-oriented network, when the link resource of the virtual circuit does not satisfy the required quality;
- and
- d) notifying the connectionless network about a link resource of the alternative route found in the connection-oriented network.
A quality-ensuring routing method in a network composed of a connectionless network including a connection-oriented network, wherein the connectionless network includes a plurality of routers and at least two routers thereof are connected to each other through a virtual circuit established in the connection-oriented network, comprising the steps of:
- a) searching for an alternative route to the virtual circuit in the connection-oriented network;
- b) distributing link resource information of the alternative route found in the connection-oriented network to each router included in the connectionless network;
- and
- c) determining a path with required quality through the connection-oriented network by referring to the link resource information of the alternative route.
A quality-ensuring routing method in a network composed of a connectionless network including a connection-oriented network, wherein the connectionless network includes a plurality of routers and at least two routers thereof are connected to each other through a virtual circuit established in the connection-oriented network, comprising the steps of:
- a) determining whether a link resource of the virtual circuit satisfies required quality;
- b) distributing only the link resource of the virtual circuit to each router included in the connectionless network, when the link resource of the virtual circuit satisfies the required quality;
- c) searching for an alternative route to the virtual circuit in the connection-oriented network, when the link resource of the virtual circuit does not satisfy the required quality;
- d) distributing a link resource of the alternative route found in the connection-oriented network to each router included in the connectionless network;
- and
- e) determining a path with required quality through the connection-oriented network by referring to the link resource information of the alternative route.
A router connecting a connectionless network and a connection-oriented network, wherein at least two routers are connected to each other through a virtual circuit established in the connection-oriented network, comprising:
- a searcher for searching for an alternative route to the virtual circuit in the connection-oriented network;
- and
- a distributor for distributing link resource information of the alternative route found in the connection-oriented network to other routers included the connectionless network.
Dependencies are inferred from the claim text.