Head End Router:- The head end router sets the local protection desired flag in the path message, it might also set the node protection desired flag also in the path message depending link protection or node protection is desired.
During network failure when the headend router receives the Path error message it tries to optimize the LSP or find a new path for the lsp, depending on the mode used global revertive mode.
Point of Local repair:- This creates a detour for the LSP that needs to be protected. It sends a path error message to the HE router if the detour is in use with the local repair in use flag set.
It also responds to the path message from the HE router by sending a RESV message to the HE router by setting the local protection available flag set.
Merge Point :- The point where the protected LSP and the protecting tunnel meet. The MP merges the traffic back from the protecting tunnel to the original LSP. In link protection MP is next hop and in the case of node protection the MP is NNHOP.
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