配置
R1
interface GigabitEthernet0/0/0
ip address 10.1.12.1 255.255.255.0
#
interface GigabitEthernet0/0/1
ip address 10.1.13.1 255.255.255.0
interface LoopBack0
ip address 1.1.1.1 255.255.255.255
#
interface LoopBack1
ip address 201.1.1.1 255.255.255.0
#
bgp 100
peer 10.1.12.2 as-number 200
peer 10.1.13.3 as-number 200
#
ipv4-family unicast
undo synchronization
network 201.1.1.0
peer 10.1.12.2 enable
peer 10.1.13.3 enable
R2
acl number 2000
rule 5 permit source 200.1.1.1 0
interface GigabitEthernet0/0/0
ip address 10.1.12.2 255.255.255.0
#
interface GigabitEthernet0/0/1
ip address 10.1.24.2 255.255.255.0
#
interface GigabitEthernet0/0/2
#
interface NULL0
#
interface LoopBack0
ip address 2.2.2.2 255.255.255.255
#
bgp 200
peer 10.1.12.1 as-number 100
peer 10.1.24.4 as-number 200
#
ipv4-family unicast
undo synchronization
peer 10.1.12.1 enable
peer 10.1.12.1 route-policy MED export
peer 10.1.24.4 enable
peer 10.1.24.4 next-hop-local
#
route-policy MED permit node 10
if-match acl 2000
apply cost 10
#
route-policy MED permit node 20
R3
acl number 2000
rule 5 permit source 200.1.1.1 0
#
interface GigabitEthernet0/0/0
ip address 10.1.13.3 255.255.255.0
#
interface GigabitEthernet0/0/1
ip address 10.1.34.3 255.255.255.0
bgp 200
peer 10.1.13.1 as-number 100
peer 10.1.34.4 as-number 200
#
ipv4-family unicast
undo synchronization
peer 10.1.13.1 enable
peer 10.1.13.1 route-policy MED export
peer 10.1.34.4 enable
peer 10.1.34.4 route-policy LOC export
peer 10.1.34.4 next-hop-local
#
route-policy MED permit node 10
if-match acl 2000
apply cost 5
#
route-policy MED permit node 20
#
route-policy LOC permit node 10
if-match ip-prefix LOC
apply local-preference 200
#
route-policy LOC permit node 20
#
ip ip-prefix LOC index 10 permit 201.1.1.0 24 greater-equal 24 less-equal 24
R4
interface GigabitEthernet0/0/0
ip address 10.1.24.4 255.255.255.0
#
interface GigabitEthernet0/0/1
ip address 10.1.34.4 255.255.255.0
interface LoopBack0
ip address 4.4.4.4 255.255.255.255
#
interface LoopBack1
ip address 200.1.1.1 255.255.255.255
#
interface LoopBack2
ip address 100.1.1.1 255.255.255.255
#
bgp 200
peer 10.1.24.2 as-number 200
peer 10.1.34.3 as-number 200
#
ipv4-family unicast
undo synchronization
network 100.1.1.1 255.255.255.255
network 200.1.1.1 255.255.255.255
peer 10.1.24.2 enable
peer 10.1.34.3 enable