Cisco BGP 調整Weight 與Local_PREF

透過route-map調整Weight 與Local_PREF的值，來達到控制連出路徑的功能
router bgp 65002
 bgp log-neighbor-changes
 neighbor 1.1.1.1 remote-as 65051
 neighbor 1.1.1.1 ebgp-multihop 2
 neighbor 1.1.1.1 soft-reconfiguration inbound
 neighbor 1.1.1.1 route-map changelocal in
!
ip prefix-list any-route seq 5 permit 0.0.0.0/0 le 32
!
ip prefix-list google-local-140 seq 5 permit 12.0.0.0/8 le 32
!
ip prefix-list google-local-50 seq 5 permit 8.0.0.0/8 le 32
!
ip prefix-list google-route seq 5 permit 8.0.0.0/8 le 32
!

route-map google50 permit 10
 match ip address prefix-list google-route
 set weight 40
!
route-map google50 permit 20
 match ip address prefix-list any-route
!
route-map changelocal permit 10
 match ip address prefix-list google-local-50
 set local-preference 50
!
route-map changelocal permit 20
 match ip address prefix-list google-local-140
 set local-preference 140
!
route-map changelocal permit 30
 match ip address prefix-list any-route