一、拓撲圖:
二、BGP同步規則:
1、配置完各路由器的IP位址和BGP協定。R2和R4再互指鄰居。同時注意把R2上的router-id指高。以便R4能學到完整路由。
2、配置完之後,看一下各路由器中學習到的全網bgp路由:
R1#sh ip route bgp
10.0.0.0/30 is subnetted, 4 subnets
B 10.1.255.4 [20/0] via 10.1.255.2, 01:30:06
B 10.1.255.12 [20/0] via 10.1.255.2, 01:30:06
B 10.1.255.8 [20/0] via 10.1.255.2, 01:30:36
150.150.0.0/24 is subnetted, 1 subnets
B 150.150.1.0 [20/0] via 10.1.255.2, 01:30:06
R2#sh ip route bgp
B 10.1.255.12 [200/0] via 10.1.255.10, 01:31:06
B 10.1.255.8 [200/0] via 10.1.255.6, 01:31:13
130.130.0.0/24 is subnetted, 1 subnets
B 130.130.1.0 [20/0] via 10.1.255.1, 01:31:13
B 150.150.1.0 [200/0] via 10.1.255.14, 01:31:01
R3#sh ip route bgp
B 10.1.255.0 [200/0] via 10.1.255.5, 01:31:21
B 10.1.255.12 [200/0] via 10.1.255.10, 04:52:27
B 130.130.1.0 [200/0] via 10.1.255.1, 01:31:15
B 150.150.1.0 [200/0] via 10.1.255.14, 04:52:22
R4#sh ip route bgp
B 10.1.255.4 [200/0] via 10.1.255.9, 01:32:32
B 10.1.255.0 [200/0] via 10.1.255.5, 01:31:39
B 130.130.1.0 [200/0] via 10.1.255.1, 01:31:34
B 150.150.1.0 [20/0] via 10.1.255.14, 04:52:46
R5#sh ip route bgp
B 10.1.255.4 [20/0] via 10.1.255.13, 04:53:03
B 10.1.255.0 [20/0] via 10.1.255.13, 01:31:56
B 10.1.255.8 [20/0] via 10.1.255.13, 04:53:03
B 130.130.1.0 [20/0] via 10.1.255.13, 01:31:25
3、從上面看到,各路由器全網的BGP路由都能學到,那麼現在我們根據拓撲圖在R2/R3/R4中運作ospf 協定。看一下對整個網絡的影響:
R2(config)#router ospf 1
R2(config-router)#net 10.1.255.0 0.0.0.3 area 0
R2(config-router)#net 10.1.255.4 0.0.0.3 area 0
R3(config)#router ospf 1
R3(config-router)#net 10.1.255.4 0.0.0.3 area 0
R3(config-router)#net 10.1.255.8 0.0.0.3 area 0
R4(config)#router ospf 1
R4(config-router)#net 10.1.255.8 0.0.0.3 area 0
R4(config-router)#net 10.1.255.12 0.0.0.3 area 0
4、在配置完之後,發現對所有的路由器并沒有影響,隻是啟用了ospf區域的路由以o來顯示,但都能學習到全網的路由:
R1#sh ip route
………………
10.0.0.0/30 is subnetted, 4 subnets
B 10.1.255.4 [20/0] via 10.1.255.2, 00:00:34
C 10.1.255.0 is directly connected, Serial1/1
B 10.1.255.12 [20/0] via 10.1.255.2, 00:00:03
B 10.1.255.8 [20/0] via 10.1.255.2, 00:00:03
C 130.130.1.0 is directly connected, Loopback0
B 150.150.1.0 [20/0] via 10.1.255.2, 00:00:03
R2#sh ip route
C 10.1.255.4 is directly connected, Serial1/1
C 10.1.255.0 is directly connected, Serial1/0
O 10.1.255.12 [110/192] via 10.1.255.6, 00:10:33, Serial1/1
O 10.1.255.8 [110/128] via 10.1.255.6, 00:10:33, Serial1/1
B 130.130.1.0 [20/0] via 10.1.255.1, 00:07:06
B 150.150.1.0 [200/0] via 10.1.255.14, 00:06:54
R3#sh ip route
C 10.1.255.4 is directly connected, Serial1/0
O 10.1.255.0 [110/128] via 10.1.255.5, 00:11:10, Serial1/0
O 10.1.255.12 [110/128] via 10.1.255.10, 00:11:10, Serial1/1
C 10.1.255.8 is directly connected, Serial1/1
B 130.130.1.0 [200/0] via 10.1.255.1, 00:07:42
B 150.150.1.0 [200/0] via 10.1.255.14, 00:07:31
R4#sh ip route
O 10.1.255.4 [110/128] via 10.1.255.9, 00:11:47, Serial1/0
O 10.1.255.0 [110/192] via 10.1.255.9, 00:11:47, Serial1/0
C 10.1.255.12 is directly connected, Serial1/1
C 10.1.255.8 is directly connected, Serial1/0
B 130.130.1.0 [200/0] via 10.1.255.1, 00:08:07
B 150.150.1.0 [20/0] via 10.1.255.14, 00:08:07
R5#sh ip route
B 10.1.255.4 [20/0] via 10.1.255.13, 00:08:31
B 10.1.255.0 [20/0] via 10.1.255.13, 00:08:31
C 10.1.255.12 is directly connected, Serial1/0
B 10.1.255.8 [20/0] via 10.1.255.13, 00:08:00
B 130.130.1.0 [20/0] via 10.1.255.13, 00:08:31
C 150.150.1.0 is directly connected, Loopback0
5、那麼在R1/R2/R3都開啟同步,看一下對EBGP有什麼影響:
R2(config)#router bgp 64513
R2(config-router)#syn
R3(config)#router bgp 64513
R3(config-router)#syn
R4(config)#router bgp 64513
R4(config-router)#syn
6、發現R1和R2學不到150.150.1.0/24這條路由了:
B 10.1.255.4 [20/0] via 10.1.255.2, 00:08:49
B 10.1.255.12 [20/0] via 10.1.255.2, 00:08:49
B 10.1.255.8 [20/0] via 10.1.255.2, 00:08:49
O 10.1.255.12 [110/192] via 10.1.255.6, 00:49:28, Serial1/1
O 10.1.255.8 [110/128] via 10.1.255.6, 00:49:28, Serial1/1
B 130.130.1.0 [20/0] via 10.1.255.1, 00:09:00
(一篇發不了,請接着看下篇)
本文轉自wxs-163 51CTO部落格,原文連結:http://blog.51cto.com/supercisco/268997