一、實驗拓撲
二、配置清單
R1>en
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#interface f0/0
R1(config-if)#ip address 192.168.12.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#interface
R1(config-if)#interface l0
R1(config-if)#ip address 1.1.1.1 255.255.255.0
R1(config-if)#no shut
R1(config-if)#interface f0/1
R1(config-if)#ip address 192.168.13.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#end
R1#conf t
R1(config-if)#interface f0/0
R1(config-if)#ip address 192.168.12.2 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#router eigrp 100
R1(config-router)#network 1.1.1.0 0.0.0.255
R1(config-router)#network 192.168.13.0 0.0.0.255
R1(config-router)#end
R1#conf t
R1(config)#router bgp 200
R1(config-router)#neighbor 192.168.12.1 remote-as 100
R1(config-router)#end
R1#conf t
R1(config)#router bgp 200
R1(config-router)# redistribute eig
R1(config-router)# redistribute eigrp 100
R1(config-router)#end
*Nov 11 20:39:32.287: %SYS-5-CONFIG_I: Configured from console by console
----------------------------------------------
R2>en
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#interface f0/0
R2(config-if)#ip address 192.168.12.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#interface
R2(config-if)#interface l0
R2(config-if)#ip address 2.2.2.2 255.255.255.0
R2(config-if)#no shut
R2(config-if)#interface f0/1
R2(config-if)#ip address 192.168.24.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#end
R2#conf t
R2(config-if)#interface f0/0
R2(config-if)#ip address 192.168.12.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#router eigrp 100
R2(config-router)#network 2.2.2.0 0.0.0.255
R2(config-router)#network 192.168.24.0 0.0.0.255
R2(config-router)#end
R2#conf t
R2(config)#router bgp 200
R2(config-router)#neighbor 192.168.12.1 remote-as 100
R2(config-router)#end
R2#conf t
R2(config)#router bgp 200
R2(config-router)# redistribute eig
R2(config-router)# redistribute eigrp 100
R2(config-router)#end
*Nov 11 20:39:32.287: %SYS-5-CONFIG_I: Configured from console by console
--------------------------------------------------------------------------------
R3：
R3>en
R3#conf t
R3(config)#interface l0
R3(config-if)#ip address 3.3.3.3 255.255.255.0
R3(config-if)#no shut
R3(config-if)#interface f0/1
R3(config-if)#ip address 192.168.13.3 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#end
R3#conf t
R3(config)#router eigrp 100
R3(config-router)#network 3.3.3.0 0.0.0.255
R3(config-router)#network 192.168.13.0 0.0.0.255
-------------------------------------------------------------------
R4：
R4>en
R4#conf t
R4(config)#interface l0
R4(config-if)#ip address 4.4.4.4 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#interface f0/1
R4(config-if)#ip address 192.168.24.4 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#end
R4#conf t
R4(config)#router eigrp 100
R4(config-router)#network 4.4.4.0 0.0.0.255
R4(config-router)#network 192.168.24.0 0.0.0.255
R4(config-router)#end
--------------------------------------------------------------------
三、測試：
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 1.1.1.0/24 is directly connected, Loopback0
D 1.0.0.0/8 is a summary, 01:11:46, Null0
C 192.168.13.0/24 is directly connected, FastEthernet0/1
2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B 2.2.2.0/24 [20/0] via 192.168.12.2, 00:30:43
B 2.0.0.0/8 [20/128256] via 192.168.12.2, 00:30:43
D 3.0.0.0/8 [90/156160] via 192.168.13.3, 01:08:36, FastEthernet0/1
B 4.0.0.0/8 [20/156160] via 192.168.12.2, 00:30:43
B 192.168.24.0/24 [20/0] via 192.168.12.2, 00:30:43
----------------------
R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B 1.1.1.0/24 [20/0] via 192.168.12.1, 00:32:26
B 1.0.0.0/8 [20/128256] via 192.168.12.1, 00:32:26
B 192.168.13.0/24 [20/0] via 192.168.12.1, 00:32:26
2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 2.2.2.0/24 is directly connected, Loopback0
D 2.0.0.0/8 is a summary, 00:47:38, Null0
B 3.0.0.0/8 [20/156160] via 192.168.12.1, 00:32:26
D 4.0.0.0/8 [90/156160] via 192.168.24.4, 00:46:52, FastEthernet0/1
C 192.168.24.0/24 is directly connected, FastEthernet0/1
---------------------
R3#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
D 1.0.0.0/8 [90/156160] via 192.168.13.1, 01:11:01, FastEthernet0/1
C 192.168.13.0/24 is directly connected, FastEthernet0/1
3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 3.3.3.0/24 is directly connected, Loopback0
D 3.0.0.0/8 is a summary, 01:11:03, Null0
---------------------
R3#ping 4.4.4.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
結論：R3只運行EIGRP沒有學習BGP 中的路由。
R3(config)#ip route 0.0.0.0 0.0.0.0 192.168.13.1
R4(config)#ip route 0.0.0.0 0.0.0.0 192.168.24.2
R3#ping 4.4.4.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/54/92 ms
R3#