Mechanism for protecting a pseudo-wire
View Patent ↗A method is provided for setting up at least two pseudo-wires able to broadcast a stream of data, wherein a first pseudo-wire is set up between an input router of a packet-switched network and first output router of the packet-switched network, and a second pseudo-wire is set up between the input router and a second output router of the packet-switched network. A first link of the first pseudo-wire is set up between the first output router and an intermediate router of the packet-switched network. A second link of the second pseudo-wire is set up between the second output router and the intermediate router. A third link of both pseudo-wires is set up between the intermediate router and the input router.
1. A method of setting up at least two pseudo-wires able to broadcast a data stream, comprising:
setting up a first pseudo-wire comprising a first link set up between an input router of a packet-switched network and an intermediate router of the packet-switched network and a second link set up between said intermediate router and a first output router of the packet-switched network; and
setting up a second pseudo-wire between said input router and a second output router of the packet-switched network, wherein the second pseudo-wire comprises said first link and a third link set up between said intermediate router and said second output router, said first link being shared by the first and second pseudo-wires.
2. The method according to claim 1 , wherein the steps of setting up the first and second pseudo-wires are performed at the initiative of said input router by sending said intermediate router a message for setting-up said third link including an identifier of said input router, an identifier of said first output router, and a field containing an identifier of said second output router and a parameter specifying that the second pseudo-wire is a back-up pseudo-wire.
3. A method of broadcasting a data streams over a first pseudo-wire comprising a first link set up between an input router of a packet-switched network and an intermediate router of said packet-switched network and a second link set up between said intermediate router and a first output router of said packet-switched network, said method comprising:
a step of detecting a fault affecting the first output router; and
on reception of information on a fault affecting said first output router, a step of switching the data stream to a second pseudo-wire comprising said first link and a third link set up between said intermediate router and a second output router of said packet-switched network, said first link being shared by the first and second pseudo-wires.
4. An intermediate router configured to be connected by a first link to an input router of a packet-switched network and by a second link to a first output router of said packet-switched network, said first and second links constituting a first pseudo-wire able to broadcast a data stream, the intermediate router comprising:
means for receiving a first message for setting up the first link including an identifier of said input router, an identifier of said first output router, and a field containing an identifier of a second output router of said network;
means for sending a second message for setting up said second link between said intermediate router and said first output router and a third message for setting up a third link between said intermediate router and said second output router, the second message including the identifier of said input router and the identifier of said first output router, the third message including the identifier of said input router and the identifier of said second output router, and said first and third links constituting a second pseudo-wire;
means for configuring at least one switching table for said broadcasting with a parameter specifying that the second pseudo-wire is a back-up pseudo-wire, said parameter being included in the first set-up message.
5. The intermediate router according to claim 4 , wherein the intermediate router includes means for detecting a fault affecting said first output router and means for switching the stream of data from the second link to the third link.
6. A computer program product stored on a non-transitory computer-readable medium and comprising program code instructions for implementing a method of setting up at least two pseudo-wires able to broadcast a data stream when said program is executed by a computer, the program code instructions comprising instructions for:
setting up a first pseudo-wire comprising a first link set up between an input router of a packet-switched network and an intermediate router of the packet-switched network and a second link set up between said intermediate router and a first output router of the packet-switched network; and
setting up a second pseudo-wire between said input router and a second output router of the packet-switched network, wherein the second pseudo-wire comprises said first link and a third link set up between said intermediate router and said second output router, said first link being shared by the first and second pseudo-wires.
7. A computer program product stored on a non-transitory computer-readable medium and comprising program code instructions for implementing a method of broadcasting a data streams over a first pseudo-wire when said program is executed by a computer, wherein the first pseudo-wire comprises a first link set up between an input router of a packet-switched network and an intermediate router of said packet-switched network and a second link set up between said intermediate router and a first output router of said packet-switched network, the program code instructions comprising instructions for:
detecting a fault affecting the first output router; and on reception of information on a fault affecting said first output router, switching the data stream to a second pseudo-wire comprising said first link and a third link set up between said intermediate router and a second output router of said packet-switched network, said first link being shared by the first and second pseudo-wires.
8. A method comprising:
generating a signal configured to be transmitted between an input router of a packet-switched network and an intermediate router of said packet-switched network, said signal carrying a message for setting up at least two pseudo-wires able to broadcast a stream of data, a first pseudo-wire being set up between said input router and a first output router of said packet-switched network, a second pseudo-wire being set up between said input router and a second output router of said packet-switched network, said set-up message including:
an identifier of said input router;
an identifier of said first output router; and
a field containing an identifier of said second output router and a parameter specifying that the second pseudo-wire is a back-up pseudo-wire; and transmitting the signal between the input router of the packet-switched network and the intermediate router of said packet-switched network.
9. The method according to claim 8 , wherein the field further contains an identifier of said intermediate router.