mRSVP-TE based fast reroute in detour (1:1) protection mode

1. An apparatus comprising:

a processor;

a memory coupled to the processor; and

a transmitter coupled to the processor and configured to:

transmit a multicast Resource Reservation Protocol-Traffic Engineering (mRSVP-TE) path request (PATH) message upstream,

wherein the PATH message requests reservation of a backup Label Switched Path (LSP) to protect an active LSP configured to transmit multicast data,

wherein the processor is configured to:

assign a downstream label to the backup LSP; and

encode the downstream label in the PATH message,

wherein the memory comprises a Forwarding Information Base (FIB), and

wherein the processor is further configured to store information designating the backup LSP and the downstream label as a binding in the FIB.

2. The apparatus of claim 1 , wherein the PATH message is transmitted to support a detour mode fast reroute protocol.

3. The apparatus of claim 1 , wherein the active LSP traverses the apparatus.

4. The apparatus of claim 1 , wherein the apparatus is a terminal network node on the active LSP.

5. The apparatus of claim 4 , wherein the apparatus is positioned at an edge of a Multiprotocol Label Switching (MPLS) domain in a data center, and further configured to communicate with MPLS transit nodes in the data center.

6. The apparatus of claim 1 , wherein the PATH message is transmitted toward a Point of Local Repair (PLR) network node via a backup path network node (Pn) positioned on the requested backup LSP.

7. The apparatus of claim 6 , wherein Pn is not positioned on the active LSP.

8. The apparatus of claim 6 further comprising a receiver coupled to the processor and configured to receive an mRSVP-TE reserve (RESV) message from the PLR network node via the Pn.

9. The apparatus of claim 8 , wherein the RESV message comprises an upstream label associated with the backup LSP.

10. The apparatus of claim 1 , wherein the backup LSP protects a link of the active LSP, a node of the active LSP, or combinations thereof.

11. A non-transitory computer readable medium comprising a computer program product comprising executable instructions, wherein the instructions when executed by a processor cause a network element (NE) to:

receive a first multicast Resource Reservation Protocol-Traffic Engineering (mRSVP-TE) path request (PATH) message from a first downstream node, wherein the first PATH message requests reservation of an active Label Switch Path (LSP);

receive a second PATH message from a second downstream node, wherein the second PATH message requests reservation of a backup LSP to protect the active LSP; and

transmit a mRSVP-TE reserve (RESV) message toward the downstream node via the requested backup LSP,

wherein the RESV confirms reservation of resources for the backup LSP,

wherein the NE acts as a Point of Local Repair (PLR) along the active LSP,

wherein the active LSP is configured to transmit multicast data, and wherein the instructions further cause the NE to:

assign an upstream label to the backup LSP when the active LSP is part of a Receiver-Driven Multipoint-to-Multipoint (RD MP2MP) tree; and

encode the upstream label in the RESV message.

12. A non-transitory computer readable medium comprising a computer program product comprising executable instructions, wherein the instructions when executed by a processor cause a network element (NE) to:

receive a first multicast Resource Reservation Protocol-Traffic Engineering (mRSVP-TE) path request (PATH) message from a first downstream node, wherein the first PATH message requests reservation of an active Label Switch Path (LSP);

receive a second PATH message from a second downstream node, wherein the second PATH message requests reservation of a backup LSP to protect the active LSP; and

transmit a mRSVP-TE reserve (RESV) message toward the downstream node via the requested backup LSP,

wherein the RESV message confirms reservation of resources for the backup LSP,

wherein the NE acts as a Point of Local Repair (PLR) along the active LSP,

wherein the active LSP is configured to transmit multicast data, and

wherein the NE does not assign a downstream label when the active LSP is part of a Receiver-Driven Point-to-Multipoint (RD P2MP) tree.

13. A non-transitory computer readable medium comprising a computer program product comprising executable instructions, wherein the instructions when executed by a processor cause a network element (NE) to:

receive a first multicast Resource Reservation Protocol - Traffic Engineering (mRSVP-TE) path request (PATH) message from a first downstream node, wherein the first PATH message requests reservation of an active Label Switch Path (LSP); and

receive a second PATH message from a second downstream node, wherein the second PATH message requests reservation of a backup LSP to protect the active LSP,

wherein the NE acts as a Point of Local Repair (PLR) along the active LSP,

wherein the active LSP is configured to transmit multicast data,

wherein the PATH message comprises a downstream label assigned by a backup path network node (Pn) positioned on the requested backup LSP, and wherein the instructions further cause the NE to:

store the downstream label in a Forwarding Information Base (FIB); and

when the active LSP fails, perform a fast reroute protocol by:

encoding the downstream label in a multicast data packet; and

forwarding the multicast data packet along the backup LSP.