Mrsvp-te based fast reroute in detour (1:1) protection mode

An apparatus comprising:

• at least one receiver;
• at least one transmitter configured to send a first multicast Resource Reservation Protocol-Traffic Engineering (mRSVP-TE) path request (PATH) message toward a multicast sender over a primary Label Switch Path (LSP);
• and
• a non-transitory memory comprising instructions;
• a processor coupled to the memory that reads and executes the instructions to:
• cause the apparatus to act as a merge point (MP) for merging traffic between a detour LSP and a primary LSP;
• check whether a detour route is available for protection of the primary LSP;
• and
• select a shortest detour route on a hop-by-hop basis and initiate setup of the detour LSP when at least one detour route is found, wherein detour LSP setup comprises assigning a Point of Local Repair (PLR) as an end point of a detour LSP by:
• sending, via the transmitter, a second PATH message toward the PLR along the shortest detour route;
• and
• receiving, via the receiver, a mRSVP-TE reserve (RESV) message from the PLR.

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:

• send a first multicast Resource Reservation Protocol-Traffic Engineering (mRSVP-TE) path request (PATH) message toward a multicast sender over a primary Label Switch Path (LSP);
• check whether a detour route is available for protection of the primary LSP;
• and
• select a shortest detour route on a hop-by-hop basis and initiate a detour LSP setup when at least one detour route is found, wherein detour LSP setup comprises assigning a Point of Local Repair (PLR) as an end point of a detour LSP by:
• sending a second PATH message toward the PLR along the shortest detour route;
• and
• receiving a mRSVP-TE reserve (RESV) message from the PLR.