526互联

HCIP-BGP选路作业

发布时间 2023-04-13 18:13:41作者: 胧月北宸

 

一、配置接口IP地址与环回地址

[r1-GigabitEthernet0/0/0]ip address 12.0.0.1 24
[r1-GigabitEthernet0/0/1]ip address 13.0.0.1 24
[r1-GigabitEthernet0/0/2]ip address 15.0.0.1 24
[r1-LoopBack0]ip address 1.1.1.1 32
[r1-LoopBack1]ip address 192.168.100.1 24

 

[r2-GigabitEthernet0/0/0]ip address 24.0.0.2 24
[r2-GigabitEthernet0/0/1]ip address 12.0.0.2 24
[r2-LoopBack0]ip address 2.2.2.2 32 
[r2-LoopBack1]ip address 192.168.20.1 24

 

[r3-GigabitEthernet0/0/0]ip address 34.0.0.3 24
[r3-GigabitEthernet0/0/1]ip address 13.0.0.3 24
[r3-LoopBack0]ip address 3.3.3.3 32
[r3-LoopBack1]ip address 192.168.30.1 24

 

[r4-GigabitEthernet0/0/0]ip address 24.0.0.4 24
[r4-GigabitEthernet0/0/1]ip address 34.0.0.4 24
[r4-LoopBack0]ip address 192.168.1.1 24
[r4-LoopBack1]ip address 192.168.2.1 24
[r4-LoopBack2]ip address 192.168.3.1 24

 

[r5-GigabitEthernet0/0/0]ip address 15.0.0.5 24
[r5-LoopBack0]ip address 192.168.10.1 24
[r5-LoopBack1]IP address 192.168.11.1 24
[r5-LoopBack2]ip address 192.168.12.1 24

 

二、配置OSPF配通路由器

[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]a 0
[r1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[r1-ospf-1-area-0.0.0.0]network 192.168.100.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 12.0.0.1 0.0.0.0
[r1-ospf-1-area-0.0.0.0]network 13.0.0.1 0.0.0.0
[r1-ospf-1-area-0.0.0.0]network 15.0.0.1 0.0.0.0

 

[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a 0
[r2-ospf-1-area-0.0.0.0]network 24.0.0.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 12.0.0.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 192.168.20.0 0.0.0.255

 

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a 0
[r3-ospf-1-area-0.0.0.0]network 13.0.0.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 34.0.0.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 192.168.30.0 0.0.0.255

 

三、运行BGP

[r1]bgp 123
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.0.0.2 as-number 123
[r1-bgp]peer 12.0.0.2 connect-interface l 0
[r1-bgp]peer 13.0.0.3 as-number 123
[r1-bgp]peer 13.0.0.3 connect-interface l 0
[r1-bgp]peer 15.0.0.5 as-number 500
[r1-bgp]peer 15.0.0.5 connect-interface l 0
[r1]bgp 123
[r1-bgp]network 192.168.100.0 24

 

[r2]bgp 123
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.0.0.1 as-number 123
[r2-bgp]peer 12.0.0.1 connect-interface l 0
[r2-bgp]peer 24.0.0.4 as-number 400
[r2-bgp]peer 24.0.0.4 connect-interface l 0
[r2]bgp 123
[r2-bgp]network 192.168.20.0 24

 

[r3]bgp 123
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 13.0.0.1 as-number 123
[r3-bgp]peer 13.0.0.1 connect-interface l 0
[r3-bgp]peer 34.0.0.4 as-number 400
[r3-bgp]peer 34.0.0.4 connect-interface l 0
[r3]bgp 123
[r3-bgp]network 192.168.30.0 24

 

[r4]bgp 400
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 24.0.0.2 as-number 123
[r4-bgp]peer 34.0.0.3 as-number 123
[r4]bgp 400
[r4-bgp]network 192.168.1.0 24
[r4-bgp]network 192.168.2.0 24
[r4-bgp]network 192.168.3.0 24

 

[r5]bgp 500
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 15.0.0.1 as-number 123
[r5]bgp 500
[r5-bgp]network 192.168.10.0 24
[r5-bgp]network 192.168.11.0 24
[r5-bgp]network 192.168.12.0 24

 

四、使用preval策略，确保R4通过R2到达192.168.10.0/24

[r4]ip ip-prefix PV permit 192.168.10.0 24
[r4]route-policy PV permit node 10
Info: New Sequence of this List.
[r4-route-policy]if-match ip-prefix PV
[r4-route-policy]apply preferred-value 100
[r4-route-policy]q
[r4]route-policy PV permit node 20
[r4]bgp 400
[r4-bgp]peer 24.0.0.2 route-policy PV import

 

五、使用AS_PATH策略，确保R4通过R3到达192.168.11.0/24

[r4]route-policy AS permit node 11
Info: New Sequence of this List.
[r4-route-policy]if-match ip-prefix AS
[r4-route-policy]apply as-path 400 123 overwrite
[r4-route-policy]q
[r4]route-policy AS permit node 21
Info: New Sequence of this List.
[r4-route-policy]q
[r4]bgp 400
[r4-bgp]peer 34.0.0.3 route-policy AS export

 

六、使用MED策略，确保R4通过R3到达192.168.12.0/24

[r3]ip ip-prefix MED permit 192.168.12.0 24
[r3]route-policy MED permit node 10[r3-route-policy]if-match ip-prefix MED
[r3-route-policy]apply cost 20
[r3]route-policy MED permit node 20
[r3]bgp 123
[r3-bgp]peer 34.0.0.4 route-policy MED export

[r4]bgp 400
[r4-bgp]default med 10

 

七、使用Local Preference策略，确保R1通过R2到达192.168.1.0，R1通过R3到达192.168.2.0

[r1]ip ip-prefix LP permit 192.168.1.0 24
[r1]route-policy LP permit node 10
[r1-route-policy]if-match ip-prefix LP
[r1-route-policy]apply local-preference 200
[r1]route-policy LP permit node 20
Info: New Sequence of this List.
[r1-route-policy]bgp 123
[r1-bgp]peer 12.0.0.2 route-policy LP import


[r1]ip ip-prefix LP2 permit 192.168.2.0 24
[r1]route-policy LP2 permit node 11
[r1-route-policy]if-match ip-prefix LP2
[r1-route-policy]apply local-preference 200
[r1]route-policy LP2 permit node 21
[r1]bgp 123
[r1-bgp]peer 13.0.0.3 route-policy LP2 import

 

八、配置负载均衡，确保R1通过R2和R3到达192.168.3.0

[r1]bgp 123
[r1-bgp]maximum load-balancing 2
[r1-bgp]load-balancing as-path-ignore

 

九、使用AS策略，AS 500不接受任何始发于AS 123的路由

[r1]ip as-path-filter 1 deny _123$
[r1]ip as-path-filter 1 permit .*
[r1]bgp 123
[r1-bgp]peer 15.0.0.5 as-path-filter 1 export