Solved: Synchronisation Rule

sohail_sarwar · ‎06-03-2010

Conditions

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

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

Giuseppe Larosa · ‎06-03-2010

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

View solution in original post

Giuseppe Larosa · ‎06-03-2010