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QUESTION: 381

Refer to the exhibit.

An engineer is reaching network 172.16.10.0/24 via the R1-R2-R4 path. Which configuration forces the traffic to take a path of R1-R3-R4?

R1(config)#route-map RM_LOCAL_PREF permit 10
R1(config-route-map)#set local-preference 101
R1(config-route-map)#exit
R1(config)#router bgp 100
R1(config-router)#neighbor 13.13.13.3 route-map RM_LOCAL_PREF in
R1(config-router)#end
R1#clear ip bgp 13.13.13.3 soft in
R1(config)#route-map RM_AS_PATH_PREPEND
R1(config-route-map)#set as-path prepend 200 200
R1(config-route-map)#exit
R1(config)#router bgp 100
R1(config-router)#neighbor 12.12.12.2 route-map RM_AS_PATH_PREPEND in
R1(config-router)#end
R1#clear ip bgp 12.12.12.2 soft in
R1(config)#router bgp 100
R1(config-router)#neighbor 13.13.13.3 weight 1
R1(config-router)#end
R2(config)#route-map RM_MED permit 10
R2(config-route-map)#set metric 1
R2(config-route-map)#exit
R2(config)#router bgp 200
R2(config-router)#neighbor 12.12.12.1 route-map RM_MED out
R2(config-router)#end
R2#clear ip bgp 12.12.12.1 soft out

Answer(s): A

Explanation:

A: This will prefer both router to choose R1 - R3 - R4, as Local Preference is shared within the same AS.
B: AS-PREPEND is adding 200 200 - that's is NOT allowed as this is the neighbor AS and you can only prepend the local AS.
C: This will not work because Weight attribute requires a route map - The Router won't allow to set the weight directly like this - TESTED.
D. The MED attribute is only affecting how inbound traffic will reach us and NOT how we go out.

route-map Q_381 permit 10
set local-preference 101
!
router bgp 3
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor GR_AS2 peer-group
neighbor GR_AS2 remote-as 2
neighbor GR_AS2 password 7 1511021F0725
neighbor 192.168.255.22 peer-group GR_AS2
neighbor 192.168.255.55 remote-as 5
!
address-family ipv4
redistribute connected
neighbor GR_AS2 soft-reconfiguration inbound
neighbor GR_AS2 route-map Q_381 in
neighbor 192.168.255.22 activate
neighbor 192.168.255.55 activate
neighbor 192.168.255.55 soft-reconfiguration inbound
neighbor 192.168.255.55 route-map to_R5 in
exit-address-family
!