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What is synchronization, and how does it influence BGP routes installed in the IP routing table?

April 26, 2017BGP influence installed IP routes routing synchronization Table

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What is synchronization, and how does it influence BGP routes installed in the IP routing table?

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A. If your AS passes traffic from another AS to a third AS, BGP should not advertise a route before all routers in your AS learn about the route via IGP. BGP waits until IGP propagates the route within the AS and then advertises it to external peers. A BGP router with synchronization enabled does not install iBGP learned routes into its routing table if it is not able to validate those routes in its IGP. Issue the no synchronization command under router bgp in order to disable synchronization. This prevents BGP from validating iBGP routes in IGP. Refer to BGP Case Studies: Synchronization for a more detailed explanation.