bgp always-compare-med and bgp deterministic-med

bgp always-compare-med 

R8

ip prefix-list routefromr1 seq 5 permit 11.11.11.11/32

route-map routefromr1 permit 10

 match ip address prefix-list routefromr1

 set metric 100

!

route-map routefromr1 permit 20

router bgp 201

 bgp asnotation dot

 neighbor 98.0.0.9 remote-as 401

 neighbor 98.0.0.9 route-map routefromr1 out

R6

ip prefix-list routefromr1 seq 5 permit 11.11.11.11/32

route-map routefromr1 permit 10

 match ip address prefix-list routefromr1

 set metric 50

!

route-map routefromr1 permit 20

router bgp 1.301

 bgp asnotation dot

 neighbor 96.0.0.9 remote-as 401

 neighbor 96.0.0.9 route-map routefromr1 out

R9

We can see there is no effect of metric in route selection as prefixes are from different AS.

We can change this behavior   by below command

R9(config)#router bgp 401

R9(config-router)#bgp always-compare-med

bgp deterministic-med

 *>i 9.9.9.9/32       16.0.0.6                50    100      0 1.301 401 i
 *                    56.0.0.6               100             0 1.301 401 i

 * i                  28.0.0.8                25    100      0 201 401 i