Refer to the exhibit.
Autonomous systems 200 and 300 have EBGP sessions established
with their directly connected routers in autonomous system 100. IGP has been configured on
all routers in autonomous system 100 and they successfully exchange routing updates.
Traffic originated in autonomous system 200 cannot reach the destination autonomous
system 300. What configuration should be done on the routers in autonomous system 100 in
order for the traffic coming from autonomous system 200 to be forwarded to autonomous system 300?
A.
IBGP session must be established between routers R1 ?R2 and R2 ?R3, and the
synchronization must be turned off.
B.
IBGP speakers within autonomous 100 must be fully meshed, and the synchronization
must be turned on.
C.
IBGP session must be established between routers R1 ?R2 and R2 ?R3, and the
synchronization must be turned on.
D.
IBGP session must be established between routers R1 and R3, and the synchronization
must be turned off.
E.
IBGP speakers within autonomous 100 must be fully meshed, and the synchronization
must be turned off.
F.
IBGP session must be established between routers R1 and R3, and the synchronization
must be turned on.
The BGP synchronization rule states that if an AS provides transit service to another AS, BGP should not advertise a route until all of the routers within the AS have learned about the route via an IGP
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http://www.nnk.com.au/index.php?option=com_content&view=article&id=22:bgp-synchronization&catid=3:articles&Itemid=5
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“This is what synchronization is all about – not installing IBGP routes into the routing table before being synchronised to the IGP.”
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