Fast reroute: one-to-one backup and facility backup

In simple term 1-to-1 Backup will swap the LSP label where Facility Backup ( node or link ) will create an new LSP and tunnel all the LSP inside / so added a new label.

https://www.nanog.org/meetings/nanog30/presentations/soricelli.pdf

https://www.juniper.net/documentation/en_US/junos-space-apps/connectivity-services-director2.0/topics/concept/link-node-protection-types-overview.html