ネットワーク【3分】シンキング – BGPのMulti Exit Discriminator(MED) アトリビュートについて理解しよう！

AS1-R1 コンフィグ
hostname AS1-R1
!
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface Loopback10
ip address 10.10.10.10 255.255.255.255
!
interface Loopback20
ip address 20.20.20.20 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
!
interface FastEthernet1/0
ip address 192.168.2.1 255.255.255.0
!
router bgp 1
no synchronization
redistribute connected route-map ConnectedToBGP
neighbor 192.168.1.2 remote-as 100
neighbor 192.168.1.2 route-map MED-1 out
neighbor 192.168.2.2 remote-as 100
neighbor 192.168.2.2 route-map MED-2 out
no auto-summary
!
ip prefix-list LB10 seq 5 permit 10.10.10.10/32
ip prefix-list LB20 seq 5 permit 20.20.20.20/32
!
route-map ConnectedToBGP permit 10
match interface Loopback10 Loopback20
!
route-map MED-1 permit 10
match ip address prefix-list LB10
set metric 100
!
route-map MED-1 permit 20
set metric 200
!
route-map MED-2 permit 10
match ip address prefix-list LB20
set metric 100
!
route-map MED-2 permit 20
set metric 200
!
end

AS100-R3 コンフィグ
hostname AS100-R3
!
interface Loopback1
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
ip address 172.16.1.2 255.255.255.0
!
interface FastEthernet1/0
ip address 172.16.2.2 255.255.255.0
!
router ospf 1
network 4.4.4.4 0.0.0.0 area 0
network 172.16.1.0 0.0.0.255 area 0
network 172.16.2.0 0.0.0.255 area 0
!
router bgp 100
no synchronization
neighbor 2.2.2.2 remote-as 100
neighbor 2.2.2.2 update-source Loopback1
neighbor 3.3.3.3 remote-as 100
neighbor 3.3.3.3 update-source Loopback1
no auto-summary
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
end