Weight_Attribute (MED)

MED
1)configure normally

traceroute 4.4.4.4 sourece 5.5.5.5

R4
receives the traffic towards 4.4.4.0/24 from R1
and the traffic towards 44.44.44.0/24 from R2 when use MED

R4
ip prefix-list lo 0 seq 5 permit 4.4.4.0/24
ip prefix-list lo 1 seq 5 permit 44.44.44.0/24
route-map RETURN_TRAFFIC-R1 permit 10
match ip address prefix-list lo 1
set metric 300
route-map RETURN-TRAFFIC-R1 permit 999
route-map RETURN_TRAFFIC-R2 permit 10
match ip address prefix-list lo 0
set metric 300
route-map RETURN-TRAFFIC-R2 permit 999
router bgp 40
nei 10.1.14.1 route-map RETURN_TRAFFIC R1 out
nei 10.1.24.2 route-map RETURN_TRAFFIC R2 out