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BGP Synchronization

Suppose iBGP is not running on AS 65500 and synchronization is OFF. What will happen when Router B receive route to network 172.16.0.0. Which router in AS 65500 will also receive this network update ?

Thanks.

BGP-Synchronization.bmp

JFrederick29

No others than Router B will receive the route without running iBGP unless Router B is redistributing BGP into an IGP like OSPF or EIGRP which is running between all AS 65500 routers.

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AXISHK

ASKER

Thanks. But how about if all iBGP is running on each routers, but they are not fully meshed. ie. there is only physical connection between B - C - D - E. In this case, can each of them receive network 172.16.0.0 ??

Thanks again.

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JFrederick29

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AXISHK

ASKER

To clarify my understanding, do you mean that only Router B & C network receive 172.16.0.0 within AS 65500 through iBGP. Do I get the same result if synchronization is turn on / off ?

Thanks

JFrederick29

No, nothing to do with synchronization but rather split horizon.

AXISHK

ASKER

Thanks.

So, does it mean even though iBGP is running on B, C, D and E, only Router B could receive route to 172.16.0.0 as they are not physically full meshed ?

Thanks

JFrederick29

Yes, correct. You can fully mesh logically however, i.e. Router C could peer with Router A through router B (physically). There is no directly connected requirements in iBGP like there is in eBGP.