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1. WO2007139542 - UNINTERRUPTED NETWORK CONTROL MESSAGE GENERATION DURING LOCAL NODE OUTAGES

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]
What is claimed is:

1. A method for providing uninterrupted network control message generation during local node outages, comprising:
receiving a plurality of sent messages from a protocol state machine;
forwarding the sent messages to a plurality of nodes in a network;
receiving a plurality of received messages from the nodes;
storing the sent and received messages in a buffer; and
sending messages to and receiving messages from the nodes, upon failure of the protocol state machine, so long as the buffer remains valid.

2. The method of claim 1 , wherein the messages are sent periodically to the nodes.

3. The method of claim 1 , further comprising:
determining whether the buffer is valid based on the sent and received message in the buffer and messages received from the nodes after the failure.

4. The method of claim 1 , further comprising:
switching to a standby protocol state machine, upon failure of the protocol state machine, the standby protocol state machine including another buffer including replicas of the sent and received messages.

5. A system for providing uninterrupted network control message generation during local node outages, comprising:
a protocol state machine for generating a plurality of messages;
a message cache for receiving the messages from the protocol state machine and forwarding them to a plurality of nodes in a network, the message cache storing both messages sent to the nodes and messages received from the nodes in at least one buffer;
wherein the message cache sends messages to and receives message from the nodes, upon failure of the protocol state machine, so long as the message cache remains valid.

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6. The system of claim 5, wherein the message cache includes a timer for sending periodic messages to the nodes.

7. The system of claim 5, wherein the message cache includes a status control for determining whether the message cache is valid.

8. The system of claim 7, wherein the protocol state machine is a worker protocol state machine, the message cache is a worker message cache, and a worker node includes the worker protocol state machine and the worker message cache; and further comprising:
a protection node including a protection protocol state machine and a protection message cache;
wherein the protection state machine is able to become active upon failure of the worker protocol state machine.

9. The system of claim 7, wherein the protection message cache replicates the worker message cache, while the worker protocol state machine is active.

10. A computer readable medium storing instructions for performing a method for providing uninterrupted network control message generation during local node outages, the method comprising:
receiving a plurality of sent messages from a protocol state machine;
forwarding the sent messages to a plurality of nodes in a network;
receiving a plurality of received messages from the nodes;
storing the sent and received messages in a buffer; and
sending messages to and receiving messages from the nodes, upon failure of the protocol state machine, so long as the message cache remains valid.

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