BGP路由黑洞实验

 

 

首先有关这次试验的几个知识点：

1、解决路由黑洞的方法
  a、物理线路的full-mesh
  b、BGP重分布到IGP中
  c、IBGP的full-mesh(相当于R1-R2-R3逻辑互联)
  d、MPLS(最优解决方案)
2、PEER-GROUP作用
  a、减少命令行
  b、减少buffer
  c、应用于IBGP
3、IGP nwtwork的作用
  a、从接口发送hello包
  b、通告路由
  而BGP的network的作用：
  只是通告路由(路由表里有的就可以network)。

关于R1/R2/R3/R4/R5的配置分别如下：

路由器R1:

R1#sh run
Building configuration...

Current configuration : 1268 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
no ip domain lookup
!
ip cef
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 12.1.1.1 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 ip address 13.1.1.1 255.255.255.0
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 100
 network 1.0.0.0
 network 12.0.0.0
 network 13.0.0.0
 no auto-summary
!
router bgp 123
 no synchronization
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 network 1.1.1.0 mask 255.255.255.0
 neighbor IBGP peer-group
 neighbor IBGP remote-as 123
 neighbor IBGP update-source Loopback0
 neighbor 2.2.2.2 peer-group IBGP
 neighbor 3.3.3.3 peer-group IBGP
 no auto-summary
!
ip classless
no ip http server
!
gatekeeper
 shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
!
end

路由器R2:

R2#sh run
Building configuration...

Current configuration : 1349 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
no ip domain lookup
!
ip cef
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 12.1.1.2 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 ip address 24.1.1.2 255.255.255.0
 serial restart-delay 0
 clock rate 64000
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 100
 network 2.0.0.0
 network 12.0.0.0
 no auto-summary
!
router bgp 123
 no synchronization
 bgp router-id 2.2.2.2
 bgp log-neighbor-changes
 network 2.2.2.0 mask 255.255.255.0
 neighbor 1.1.1.1 remote-as 123
 neighbor 1.1.1.1 update-source Loopback0
 neighbor 1.1.1.1 next-hop-self
 neighbor 3.3.3.3 remote-as 123
 neighbor 3.3.3.3 update-source Loopback0
 neighbor 3.3.3.3 next-hop-self
 neighbor 24.1.1.4 remote-as 4
 no auto-summary
!
ip classless
no ip http server
!       
gatekeeper
 shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
!
end

路由器R3：
R3#sh run
Building configuration...

Current configuration : 1448 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
no ip domain lookup
!
ip cef
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 35.1.1.3 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 ip address 13.1.1.3 255.255.255.0
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 100
 network 3.0.0.0
 network 13.0.0.0
 no auto-summary
!
router bgp 123
 no synchronization
 bgp router-id 3.3.3.3
 bgp log-neighbor-changes
 network 3.3.3.0 mask 255.255.255.0
 neighbor 1.1.1.1 remote-as 123
 neighbor 1.1.1.1 update-source Loopback0
 neighbor 1.1.1.1 next-hop-self
 neighbor 2.2.2.2 remote-as 123
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 2.2.2.2 next-hop-self
 neighbor 5.5.5.5 remote-as 5
 neighbor 5.5.5.5 ebgp-multihop 255
 neighbor 5.5.5.5 update-source Loopback0
 no auto-summary
!
ip classless
ip route 5.5.5.0 255.255.255.0 35.1.1.5
no ip http server
!
gatekeeper
 shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
!
end

路由器R4:

R4#sh run
Building configuration...

Current configuration : 1075 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R4
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
no ip domain lookup
!
ip cef
!
interface Loopback0
 ip address 4.4.4.4 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/1
 ip address 24.1.1.4 255.255.255.0
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
router bgp 4
 no synchronization
 bgp router-id 4.4.4.4
 bgp log-neighbor-changes
 network 4.4.4.0 mask 255.255.255.0
 network 24.1.1.0 mask 255.255.255.0
 neighbor 24.1.1.2 remote-as 123
 no auto-summary
!
ip classless
no ip http server
!
gatekeeper
 shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
!
end

路由器R5：

R5#sh run
Building configuration...

Current configuration : 1273 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R5
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
no ip domain lookup
!
ip cef
!
!
interface Loopback0
 ip address 5.5.5.5 255.255.255.0
!
interface Loopback1
 ip address 192.168.5.5 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!        
interface Serial1/0
 ip address 35.1.1.5 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
router bgp 5
 no synchronization
 bgp router-id 5.5.5.5
 bgp log-neighbor-changes
 network 5.5.5.0 mask 255.255.255.0
 network 35.1.1.0 mask 255.255.255.0
 network 192.168.5.0
 neighbor 3.3.3.3 remote-as 123
 neighbor 3.3.3.3 ebgp-multihop 255
 neighbor 3.3.3.3 update-source Loopback0
 no auto-summary
!
ip classless
ip route 3.3.3.0 255.255.255.0 35.1.1.3
no ip http server
!
gatekeeper
 shutdown
!        
line con 0
 exec-timeout 0 0
 logging synchronous
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
!
end