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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