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Path Option
You can configure multiple paths for an LSP with
the tunnel mpls path-option command. Each
path option has an identifying number; the lower the number the higher
the preference for that path option. In this scenario, only a single
LSP is up and active at a time. If the path option currently in use
by an LSP goes down, MPLS tries to reroute the tunnel using the path
option with the next highest preference. In certain circumstances—for
example, when a tunnel is preempted by another—MPLS first attempts
to reroute the tunnel with the current path option.
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