18.8 BFD基础-大赛人网

8.BFD与BGP联动

1）R1配置OSPF

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255
[R1-ospf-1-area-0.0.0.0]network 13.1.1.0 0.255.255.255
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0

2）R2配置OSPF

[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 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 12.1.1.0 0.255.255.255
[R2-ospf-1-area-0.0.0.0]network 24.1.1.0 0.255.255.255

3）R3配置OSPF

[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 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 13.1.1.0 0.255.255.255 
[R3-ospf-1-area-0.0.0.0]network 34.1.1.0 0.255.255.255

4）R4配置OSPF

[R4]ospf 1 router-id 4.4.4.4
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]network 24.1.1.0 0.255.255.255
[R4-ospf-1-area-0.0.0.0]network 34.1.1.10 0.255.255.255
[R4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0

5）R1配置BGP

[R1]bgp 1234
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 2.2.2.2 as-number 1234
[R1-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[R1-bgp]peer 2.2.2.2 next-hop-local
[R1-bgp]peer 3.3.3.3 as-number 1234
[R1-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[R1-bgp]peer 3.3.3.3 next-hop-local
[R1-bgp]peer 15.1.1.5 as-number 500

6）R2配置BGP

[R2]bgp 1234
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 1.1.1.1 as-number 1234
[R2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[R2-bgp]peer 1.1.1.1 reflect-client
[R2-bgp]peer 4.4.4.4 as-number 1234
[R2-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[R2-bgp]peer 4.4.4.4 reflect-client

7）R3配置BGP

[R3]bgp 1234
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 1.1.1.1 as-number 1234
[R3-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[R3-bgp]peer 1.1.1.1 reflect-client 
[R3-bgp]peer 4.4.4.4 as-number 1234
[R3-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[R3-bgp]peer 4.4.4.4 reflect-client

8）R4配置BGP

[R4]bgp 1234
[R4-bgp]router-id 4.4.4.4
[R4-bgp]peer 2.2.2.2 as-number 1234
[R4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[R4-bgp]peer 2.2.2.2 next-hop-local
[R4-bgp]peer 3.3.3.3 as-number 1234
[R4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[R4-bgp]peer 3.3.3.3 next-hop-local
[R4-bgp]peer 46.1.1.6 as-number 600

9）R5配置BGP

[R5]bgp 500
[R5-bgp]router-id 5.5.5.5
[R5-bgp]peer 15.1.1.1 as-number 1234
[R5-bgp]network 5.5.5.5 32

10）R6配置BGP

[R6]bgp 600
[R6-bgp]router-id 6.6.6.6     
[R6-bgp]peer 46.1.1.14 as-number 1234
[R6-bgp]network 6.6.6.6 32

11）R1配置bfd

[R1]bfd
[R1]bgp 1234
[R1]peer 2.2.2.2 bfd enable
[R1]peer 2.2.2.2 bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 4

12）R2配置bfd

[R2]bfd
[R2]bgp 1234
[R1]peer 1.1.1.1 bfd enable
[R1]peer 1.1.1.1 bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 4
[R1]peer 4.4.4.4 bfd enable
[R1]peer 4.4.4.4 bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 4

13）R4配置bfd

[R4]bfd
[R4]bgp 1234
[R4]peer 2.2.2.2 bfd enable
[R4]peer 2.2.2.2  bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 4

14）查看BGP建立的所有BFD会话

[R1]display bgp bfd session all
  Local_Address      Peer_Address       LD/RD       Interface
  1.1.1.1            2.2.2.2            8193/8194   Unknown        
  Tx-interval(ms)    Rx-interval(ms)    Multiplier  Session-State
  100                100                4           Up                  
  Wtr-interval(m)
  0         

<R2>display bgp bfd session all
  Local_Address      Peer_Address       LD/RD       Interface
  2.2.2.2            1.1.1.1            8194/8193   Unknown        
  Tx-interval(ms)    Rx-interval(ms)    Multiplier  Session-State
  100                100                4           Up                  
  Wtr-interval(m)
  0         

  Local_Address      Peer_Address       LD/RD       Interface
  2.2.2.2            4.4.4.4            8193/8192   Unknown        
  Tx-interval(ms)    Rx-interval(ms)    Multiplier  Session-State
  100                100                4           Up                  
  Wtr-interval(m)
  0         

<R4>display bgp bfd session all
  Local_Address      Peer_Address       LD/RD       Interface
  4.4.4.4            2.2.2.2            8192/8193   Unknown        
  Tx-interval(ms)    Rx-interval(ms)    Multiplier  Session-State
  100                100                4           Up                  
  Wtr-interval(m)
  0

15）R1配置策略

[R1]ip ip-prefix dsrw.com permit 5.5.5.5 32
[R1]route-policy med50 permit node 10
[R1-route-policy]if-match ip-prefix med50
[R1-route-policy]apply cost 500
[R1]route-policy med100 permit node 10
[R1-route-policy]if-match ip-prefix med100
[R1-route-policy]apply cost 1000

16）BGP应用策略

[R1]bgp 1234
[R1]bgp 1234
[R1-bgp]peer 2.2.2.2 route-policy med50 export
[R1-bgp]peer 3.3.3.3 route-policy med100 export

17）R5查看路由

<R5>tracert -a 5.5.5.5 6.6.6.6
 1 15.1.1.1 20 ms  20 ms  30 ms 
 2 12.1.1.2 30 ms  30 ms  20 ms 
 3 24.1.1.4 20 ms  40 ms  30 ms 
 4 46.1.1.6 50 ms  50 ms  50 ms

18）R1的G0/0/0口故障查看路由

[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]shutdown 
<R5>tracert -a 5.5.5.5 6.6.6.6
 1 15.1.1.1 40 ms  20 ms  20 ms 
 2 13.1.1.3 40 ms  20 ms  20 ms 
 3 34.1.1.4 30 ms  50 ms  40 ms 
 4 46.1.1.6 40 ms  50 ms  40 ms

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