Refer to the exhibit. An engineer is configuring path selection on router R1 for two ASNs as shown. Which additional task must the engineer perform on Router 1 so that all outbound traffic utilizes the link between R1 and R3 to reach ASN 4567?
A.
Configure a low weight on the peer to ASN 4567.
B.
Configure a high weight on the peer to ASN 4567.
C.
Configure an AS path prepend on the peer to ASN 4567.
B is the correct answer.
FYI: Route Selection Decision Process: Prefer ->
1. Highest weight (local to router) = Cisco Proprietary
2. Highest local preference (global within AS / antar iBGP saja)
3. Route originated by the local router (next hop = 0.0.0.0)
4. Shortest AS path
5. Lowest origin code (IGP < EGP < incomplete)
6. Lowest MED (exchanged between AS) "Metric" / antar eBGP)
7. The EBGP path over the IBGP path
8. The path through the closest IGP neighbor
9. The oldest route for EBGP paths
10. The path with the lowest neighbor BGP router ID
11. The path with the lowest neighbor IP address
AS PATH Prepending would affect the traffic coming into your AS from neighboring AS So C is wrong, you would use weight to answer the question is B, IN real life you would use LP.
Correct B
To force the traffic exit point towards link R1-R3 we have to configure a high Weight value to AS4567. The Weight attribute can be used as an alternative to the Local Preference attribute and it has "local meaning" to the R1.
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