Refer to the exhibit. An engineer has successfully fixed BGP peering issue. R1 has an established eBGP peering with R2 and R3. Which mechanism should the engineer apply in order to steer the traffic correctly?
A.
The MED attribute can be applied on R2 to influence R1 to use it as the primary path.
B.
The local preference attribute can be applied on R3 to influence AS 65513 to use AS 65515 as the secondary path.
C.
The weight attribute can be applied on R2 to influence AS 65513 to use AS 65515 as the primary path.
D.
The IGP metric can be manipulated on R1 to allow traffic to be load balanced between R2 and R3.
'A' is the only option that makes sense, guessing that 'always compare med' must be configured on R1. 'B' and 'C' are obviously wrong, while 'D' would have had some logic only if there was another PE in AS 65513 (which is not the case).
I would vote for D.
A - could be correct if we configure 'always compare med' on R1 and assume that for all prefixes advertised by AS65514 and 65515 has same AS_PATH length.
B - Local preference on R3 will influance routers in AS6514 not R1 or AS6513.
C - Weight is router lacal feature will not influance Rq
D - Some level of load balncing is achived by dafult as BGP prefers shortest AS_PATH for certain prefix (Cisco BGP path selection alghortm - rule 4) . If 1-7 rules gives no preference for certain prefix then with rule 8. Prefere lowest IGP metric to BGP next hop we can force traffic to R2 or R3 influancing load distribution.
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