Hello everyone! Today I will continue test with the methods of protection your LSP. I try to combine in this article the other three methods. It's all described in RFC4090, one of them is one-to-one backup method (FRR in terminology Juniper) when PLR computes a separate backup LSP called a detour LSP. In the one-to-one backup method, a label-switched path is established that intersects the original LSP somewhere downstream of the point of link or node failure. A separate backup LSP is established for each LSP that is backed up. About one-to-many (facility backup) I will describe later in this article. The normal is CE1-PE1-PE3-PE6-CE4, on the figure it is marked in red, and detour path will be CE1-PE1-PE4-PE3-PE6-CE4 and marked in green line.
