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FRR is configured on a network. What occurs when the headend router on the path is alerted to a link failure over IGP?
LSP attempts fast switching on the backup path until the primary path returns to the active state.
The headend router uses a presignaled LSP to bypass the failure point.
A new backup tunnel is established past the PLR to pass through the protected nodes
Backup tunnel is established and intersects with the primary tunnel at the headend.
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