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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 OS 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 OS 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.
Table 1 summarizes the traffic protection types.
Table 1: One-to-One Backup Compared with Facility Backup
Comparison | 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 |
