BGP实验

 

思路：1.ip配完，能ping通，2.开启BGP，划分AS123，3.AS2开启OSPF，内部网通，4.然后环回R234相互建邻，R12,R45环回建邻，4.再改左右下一条为自己  5.都在BGP内宣告

[r1]int l0
[r1-LoopBack0]ip add 1.1.1.1 24
[r1-LoopBack0]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.0.0.1 24
 
[r2]int l0
[r2-LoopBack0]ip add 2.2.2.2 24
[r2-LoopBack0]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 12.0.0.2 24 
[r2-GigabitEthernet0/0/0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 23.0.0.1 24
 
 
[r3-LoopBack0]ip add 3.3.3.3 24
[r3-LoopBack0]q
[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 23.0.0.2 24
[r3-GigabitEthernet0/0/0]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 34.0.0.1 24
 
[r4-LoopBack0]ip add 4.4.4.4 24
[r4-LoopBack0]q
[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 34.0.0.2 24
[r4-GigabitEthernet0/0/0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 45.0.0.1 24
 
[r5]int l0
[r5-LoopBack0]ip add 5.5.5.5 24
[r5-LoopBack0]int l1
[r5-LoopBack1]ip add 6.6.6.6 24
[r5-LoopBack1]q
[r5]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 45.0.0.2 24
  

在AS2内运行OSPF

对R2的配置：
[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 23.0.0.0 0.0.0.255
 
对R3的配置：
[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 23.0.0.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255
 
对R4的配置：
[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255 

环回R234相互建邻，R12,R45环回建邻

对R1:
 
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.0.0.2 as-number 2
 
对R2：
 
[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.0.0.1 as-number 1

对R2的配置：
[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 4.4.4.4 as-number 2    
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r2-bgp]peer 3.3.3.3 next-hop-local
[r2-bgp]peer 4.4.4.4 next-hop-local
 
对R3的配置：
[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-number 2
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0 
[r3-bgp]peer 4.4.4.4 next-hop-local
[r3-bgp]peer 2.2.2.2 next-hop-local
 
对R4的配置：
[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 2.2.2.2 as-number 2    
[r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r4-bgp]peer 2.2.2.2 next-hop-local
[r4-bgp]peer 3.3.3.3 next-hop-local

对R4:
[r4-bgp]peer 5.5.5.5 as-number 3
[r4-bgp]peer 5.5.5.5 connect-interface LoopBack 0    
[r4-bgp]peer 5.5.5.5 ebgp-max-hop 
 
对R5:
[r5]bgp 3
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 4.4.4.4 as-number 2
[r5-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r5-bgp]peer 4.4.4.4 ebgp-max-hop 2

宣告

R1宣告：
[R1-bgp]network 1.1.1.0 24
 
R5宣告：
[R5-bgp]network 99.1.1.0 24

拿1环回ping5环回