Synchronisation Rule

Answered Question
Jun 3rd, 2010
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Conditions

1. all routers are using BGP
2. synchronization is OFF in AS 647000



Synchronisation 1.JPG



Regarding the route to 198.12.1.0; which routers will this route propagate to?
A. Router TK6
B. Routers TK2 and TK6
C. Routers TK2, TK4, and TK6
D. Routers TK2, TK3, TK4, and TK6
E. Routers TK1, TK2, TK3, TK4, and TK6
F. Routers TK1, TK2, TK3, TK4, TK5, and TK6
G. It will not be propagated to any other router

Correct Answer by Giuseppe Larosa about 6 years 10 months ago

Hello Sohail,


the question is different:


>> Regarding the route to 198.12.1.0; which routers will this route propagate to?


the route is originated by TK6 and sent to TK2, TK2 propagates it to all its iBGP neighbors, TK1 propagates it to its eBGP neighbor TK5 because sync is OFF.


so the answer should be F in this case


if sync where on on TK1 it would not propagate the route to TK5 waiting to see the same route in the IGP


Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Thu, 06/03/2010 - 06:31
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Hello Sohail,


the question is different:


>> Regarding the route to 198.12.1.0; which routers will this route propagate to?


the route is originated by TK6 and sent to TK2, TK2 propagates it to all its iBGP neighbors, TK1 propagates it to its eBGP neighbor TK5 because sync is OFF.


so the answer should be F in this case


if sync where on on TK1 it would not propagate the route to TK5 waiting to see the same route in the IGP


Hope to help

Giuseppe

Mohamed Sobair Thu, 06/03/2010 - 10:40
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None of the answers is correct,



It will be propagated to TK2 and TK3,



HTH

Mohamed

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