The backup LSP tunnels for local repair are needed to be pre-established. And then FRR enable the re-direction of traffic onto backup LSP tunnels in 10s of milliseconds, in the event of a node or link in the LSP fails.

• 因此,FRR需要为主LSP隧道预先建立备份LSP隧道来进行本地修复,然后当有失效发生时,流量会在几十毫秒内自动切换往备份LSP隧道。