Fast rerouting apparatus and method for MPLS multicast
First Claim
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1. A fast rerouting apparatus for multiprotocol label switching (MPLS) multicast, comprising:
- a message sender for sending and receiving a message to and from an upstream or downstream node;
a message processor for, when a path requested for routing through a routing request message from the upstream node is a path to perform fast rerouting, sending the routing request message for establishing a Next Hop database (NHDB) to the downstream node through the message sender, and establishing the Next Hop database (NHDB) using information included in a response message received from the downstream node; and
a storage for storing the established Next Hop database (NHDB).
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Abstract
Disclosed is a fast rerouting apparatus and method for multiprotocol label switching (MPLS) multicast. The fast rerouting apparatus and method is to rapidly cope with a failure occurring on an MPLS network. The fast rerouting method of redirecting a packet to be transmitted at the nearest location from a location where the failure occurs is applied to the MPLS multicast, so that it is possible to rapidly cope with the failure generated when an MPLS multicast packet is transmitted.
133 Citations
24 Claims
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1. A fast rerouting apparatus for multiprotocol label switching (MPLS) multicast, comprising:
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a message sender for sending and receiving a message to and from an upstream or downstream node;
a message processor for, when a path requested for routing through a routing request message from the upstream node is a path to perform fast rerouting, sending the routing request message for establishing a Next Hop database (NHDB) to the downstream node through the message sender, and establishing the Next Hop database (NHDB) using information included in a response message received from the downstream node; and
a storage for storing the established Next Hop database (NHDB). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A protocol for fast rerouting for multiprotocol label switching (MPLS) multicast, the protocol comprising:
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a Next Hop object including information for establishing a Next Hop database (NHDB) used when a path for the fast rerouting of the MPLS multicast is established;
a Next-Next Hop object including information for establishing the Next Hop database (NHDB); and
a Unicast Backup LSP (Label Switched Path) Request object requesting another node of a corresponding multicast tree to set up a unicast backup path. - View Dependent Claims (11, 12, 13)
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14. A fast rerouting apparatus for multiprotocol label switching (MPLS) multicast on a MPLS network where a replacement path for fast rerouting for the MPLS multicast, the fast rerouting apparatus comprising:
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a message sender for sending and receiving a message to and from an upstream and downstream node;
a failure detector for determining whether a failure occurs between the downstream node and another node or not;
a path computer for searching the replacement node of the node where the failure occurs; and
a packet processor for determining whether a multicast packet received from the upstream node is a packet which must be transmitted through both the path where the failure occurs and the replacement path, and when the multicast packet must be transmitted through both of the paths, transmitting the multicast packet to a next branch node in a multicast packet format, and setting up a unicast backup path from the next branch node to a destination node of the packet. - View Dependent Claims (15, 16, 17, 18)
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19. A fast rerouting method for multiprotocol label switching (MPLS) multicast, comprising:
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a first step of receiving information for establishing a Next Hop database (NHDB) used for fast rerouting on a network from a downstream node;
a second step of establishing the Next Hop database (NHDB) using the received information; and
a third step of establishing a path for the fast rerouting for the MPLS multicast using the established Next Hop database (NHDB). - View Dependent Claims (20, 21, 22)
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23. A fast rerouting method for multiprotocol label switching (MPLS) multicast on a network where a backup path for fast rerouting for the MPLS multicast used is established using a Next Hop database (NHDB), the fast rerouting method comprising:
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a first step of detecting generation of a failure on a protected path;
a second step of searching the backup path of the protected path where the failure occurs;
a third step of determining whether the backup path belongs to existing transmission path of a multicast packet received from an upstream node or not; and
a fourth step of transmitting the multicast packet to a next branch node on the backup path belonging to the existing transmission path in a multicast packet format, and requesting the branch node to establish a unicast backup path from the branch node to an end node of the backup node. - View Dependent Claims (24)
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Specification