Method for diverting data packets when local link failures are identified
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Abstract
According to said method, routing information or a list of routing information is inserted or modified in the packet header of data packets, in response to a malfunction of the packet network, in order to avoid defective nodes or links. The data packets with modified headers are routed using the inserted routing information to avoid the network node that is not available. The routing information inserted in the packet header can be determined via the packet network with the aid of topological information. The invention allows a rapid response to malfunctions. Packet losses and delays in data transmission can thus be avoided immediately after the determination of the malfunction by routers adjoining the malfunction area, whereas in conventional packet networks, a problem-free data transmission can only be restored after the convergence of the modified topological information in the packet network.
32 Citations
36 Claims
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1-17. -17. (canceled)
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18. A method for diverting data packets due to a malfunction, the data packets transmitted over at least part of a packet network formed from a plurality of network nodes, comprising:
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identifying, by a first network node, an inaccessibility of a second network node;
identifying, by routing information of the first network node, a data packet to be forwarded to the second network node when the second network node is accessible, the data packet having a packet header;
modifying the packet header having a routing item in order to divert the data packet from the second network node when the second network node is inaccessible, the modification selected from the group consisting of inserting the routing item and changing the routing item; and
forwarding the modified data packet from the first network node in accordance with the modified header. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A network node in a packet network, comprising
a received data packet having a packet header including a routing item, the routing item indicating a first address of an inaccessible network node address; -
a modifier for modifying the routing item to a second address of an accessible network node, the modification selected from the group comprising changing the routing item and inserting a new routing item; and
a sending mechanism for sending the modified data packet in accordance with the modified routing item. - View Dependent Claims (35)
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36. A central control node in a packet network from a plurality of network nodes, comprising:
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a routing information determined via a network topology information adapted to avoid routing to an inaccessible node routing information; and
a transfer mechanism to convey the routing information to a network node.
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Specification