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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

Published: 2012-11-29

Supported Platforms

Published: 2012-11-29