If an OMP peer becomes unavailable, OMP graceful restart allows other OMP peers to continue operating temporarily. When a WAN Edge router loses connection to the SD-WAN Controllers, the router can continue forwarding traffic using last known good routing information. The default OMP graceful restart value is 12 hours and can be set to a maximum of 604,800 seconds, which is equivalent to 7 days. The IPsec rekey timer is set to 24 hours by default, and although both timers are configurable, the IPsec rekey timer must be at least two times the value of the OMP graceful restart timer. This is because the SD-WAN Controllers distribute the IPsec keys to the WAN Edge routers, and if connections to the SD-WAN Controllers are lost, any IPsec rekeying that occurs within the graceful restart time would cause traffic loss.
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