Example BGP Synchronization

AS 65500

AS 64520

All routers in AS 65500 are running BGP; there are no matching IGP routes.

If synchronization is on, then:

AS 65500

All routers in AS 65500 are running BGP; there are no matching IGP routes.

- Routers A, C, and D would not use or advertise the route to 172.16.0.0 until they receive the matching route via an IGP.

- Router E would not hear about 172.16.0.0. If synchronization is off (the default), then:

- Routers A, C, and D would use and advertise the route that they receive via iBgP; router E would hear about 172.16.0.0.

- If router E sends traffic for 172.16.0.0, routers A, C, and D would route the packets correctly to router B.

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