The BGP synchronization rule states that a BGP router should not use, or advertise to an external neighbor, a route learned by IBGP, unless that route is local or is learned from the IGP.
If synchronization is enabled and your autonomous system is passing traffic from one autonomous system to another, BGP should not advertise a route before all routers in your autonomous system have learned about the route via IGP. In other words, BGP and the IGP must be synchronized before networks learned from an IBGP neighbor can be used.
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