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Method of managing hop-count in label switching network and node apparatus
| Details |
Inventors: Katsube, Yasuhiro; Tanaka, Hisako;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Lim; Krisna
Assistant Examiner:
Attorney, Agent or Firm: Foley & Lardner
In a label switched path (LSP) including label switching nodes, some of which process a Time To Live (TTL) value of a generic label header and others of which that do not process the TTL value, an adequate hop-count information regarding the LSP is reported from node to node by using a label distribution protocol. A node, which has received a message including a hop-count of the LSP from an upstream node or a downstream node, determines whether or not the node itself is to update the TTL value in a packet if received through the LSP. The node then transmits a message indicating that the hop-count is one or a message including the incremented hop-count, in accordance with this determination, to the downstream node or the upstream node. Thus, upon transferring packets on the LSP, the nodes forming the LSP that process the TTL value can appropriately decrement the TTL value of the packet. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method of managing a hop-count of a label switched path in a network, the label switched path being configured by a plurality of nodes for performing a label switching operation on a packet by using an input label and an output label assigned to a packet stream including the packet, said method comprising steps of: determining, by each of the plurality of nodes, whether or not said each of the plurality of nodes is to update information included in the packet when performing the label switching operation on the packet, the information being to represent how many nodes through which the packet has passed; transmitting, by each of a first type of nodes among the plurality of nodes which determine not to update said information, when said each of the first type of nodes is notified of a hop-count regarding the label switched path by a first neighboring node on one of an upstream side and a downstream side of said each of the first type of nodes, a first message including an incremented hop-count obtained by incrementing the hop-count notified regarding the label switched path, to a second neighboring node on another one of the upstream side and the downstream side; and transmitting, by each of a second type of nodes among the plurality of nodes which determine to update said information, a second message indicating that said each of the second type of nodes is to update said information, to the second neighboring node.
2.
The method according to claim 1, further comprising a step of: transferring, by said each of the second type of nodes, the packet received from an upstream node on the upstream side to a downstream node on the downstream side by performing the label switching operation on the packet and by updating the information included in the packet based on the incremented hop-count, when said each of the second type of nodes has received the first message as the second neighboring node.
3.
The method according to claim 1, further comprising a step of: transferring, by said each of the second type of nodes, the packet received from an upstream node on the upstream side to a downstream node on the downstream side by performing the label switching operation on the packet and by updating the information included in the packet based on a default value, when said each of the second type of nodes has received the second message as the second neighboring node
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Multiplexer-related 
