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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
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AXISHK
Asked:
AXISHK
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2 Solutions
 
JFrederick29Commented:
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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602650528Commented:
If synchronisation is off, bgp must run on all routers in AS65500; that is the rule. And if you don't want to run BGP on all routers in AS65500, then you must redistribute, like JFrederick said, on routers B & E at the minimum.
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AXISHKAuthor Commented:
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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JFrederick29Commented:
In that case, only Router B and C would have the route without route reflection enabled.  With iBGP, you can peer across layer3 so all routers could fully mesh without being physically fully meshed in order for all routers in the AS to receive the route.
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AXISHKAuthor Commented:
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
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JFrederick29Commented:
No, nothing to do with synchronization but rather split horizon.
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AXISHKAuthor Commented:
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
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JFrederick29Commented:
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.
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