Fast Reroute, Node Protection, and Link Protection

RFC 4090, Fast Reroute Extensions to RSVP-TE for LSP Tunnels, describes two different types of traffic protection for RSVP-signaled LSPs:

One-to-one backup—In the JUNOS software this type of traffic protection is provided by fast reroute. Each LSP requires a protecting LSP to be signaled at each hop except the egress router. This protecting LSP cannot be shared.
Facility backup—This is sometimes called many-to-one backup. In the JUNOS software this type of traffic protection is provided by node and link protection. Each LSP requires a protecting LSP to be signaled at each hop except the egress router. Unlike fast reroute, this protecting LSP can be shared by other LSPs.

The information above is summarized in Table 9.

Table 9: One-to-One Backup Compared with Facility Backup

	One-to-One Backup	Facility Backup
Name of the protecting LSP	Detour LSP	Bypass LSP
Sharing of the protecting LSP	Cannot be shared	Can be shared by multiple LSPs
JUNOS configuration statements	fast-reroute	node-link-protection and link-protection