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Synchronization Behavior During Graceful Restart

LDP-IGP synchronization does not take place while the IGP is in the process of a graceful restart. When the graceful restart completes, links for which synchronization has been configured are advertised with maximum metrics in either of the following cases:

LDP is not yet operational on the link and no holddown timer has been configured.
The configured holddown timer has not expired.

During LDP graceful restart, no synchronization operations are done. If the LDP graceful restart is terminated, LDP notifies the IGPs to advertise the links with the maximum metric.

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