Refer to the exhibit. Which configuration change will force BR2 to reach 209.165.201.0/27 via BR1?

A. Set the origin to igp on BR2 toward PE2 inbound
B. Set the local preference to 150 on PE1 toward BR1 outbound
C. Set the weight attribute to 65,535 on BR1 toward PE1
D. Set the MED to 1 on PE2 toward BR2 outbound

Refer to the exhibit. Which configuration change will force BR2 to reach 209.165.201.0/27 via BR1?

A. Set the origin to igp on BR2 toward PE2 inbound
B. Set the local preference to 150 on PE1 toward BR1 outbound
C. Set the weight attribute to 65,535 on BR1 toward PE1
D. Set the MED to 1 on PE2 toward BR2 outbound

Correct Answer: D

We cannot set the local preference on PE1 because local preference is only sent to iBGP neighbors so this attribute cannot reach BR1 -> Answer is not correct.

Weight attribute is only used locally in a router (not be exchanged between BGP neighbors) so we cannot affect BR2 from BR1 with this attribute -> Answer is not correct.

We cannot affect BR2 routing decision by modifying BGP advertisements from BR2 toward PE2 (inbound) -> is not correct. Also if network 209.165.201.0/27 is advertised with “network” statement in BGP, BR2 will match it with origin “IGP”. Please check the example in the link below.

By default, the MED attribute is set to 0 so by increasing the MED on PE2 toward BR2, BR2 would think the metric of its direct link to PE2 is higher than the path advertised by BR1 -> BR2 would use BR1 to reach 209.165.201.0/27.

Good lab example and reference: Use Multi-Exit Discriminator to Select Best Path for BGP Router