CCNP精粹系列之二十四--BGP的水平分隔，推荐

                                           BGP的水平分隔

A:

Router(config)#host A

A(config)#int lo0

A(config-if)#ip addr 192.168.10.1 255.255.255.0

A(config-if)#no shut

A(config)#int s1/0

A(config-if)#ip addr 202.110.100.1 255.255.255.0

A(config-if)#encap hdlc

A(config-if)#clock rate 56000

A(config)#router bgp 64500

A(config-router)#neighbor 202.110.100.2 remote-as 64500

A(config-router)#net 192.168.10.0

A(config-router)#net 202.110.100.0

B:

Router(config)#host B

B(config)#int s1/0

B(config-if)#ip addr 202.110.100.2 255.255.255.0

B(config-if)#encap hdlc

B(config-if)#no shut

B(config-if)#exit

B(config-router)#router bgp 64500

B(config-router)#neighbor 202.110.100.1 remote-as 64500

B(config-router)#net 202.110.100.0

B(config)#int s1/1

B(config-if)#ip addr 202.110.101.1 255.255.255.0

B(config-if)#clock rate 56000

B(config)#router bgp 64500

B(config-router)#neighbor 202.110.101.2 remote-as 64500

B(config-router)#net 202.110.101.0

R3

Router(config)#host R3

R3(config)#int s1/1

R3(config-if)#ip addr 202.110.101.2 255.255.255.0

R3(config-if)#encap hdlc

R3(config-if)#no shut

R3(config-if)#exit

*Apr 21 21:00:10.551: %LINK-3-UPDOWN: Interface Serial1/1, changed state to upbgp

*Apr 21 21:00:11.555: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to up 64500

R3(config-router)#router bgp 64500

R3(config-router)#neighbor 202.110.101.1 remote-as 64500

R3(config-router)#net 202.110.101.0

试验结果：

R2能学到10网段路由，R3学不到路由。

B#show ip ro

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    202.110.100.0/24 is directly connected, Serial1/0

C    202.110.101.0/24 is directly connected, Serial1/1

B    192.168.10.0/24 [200/0] via 202.110.100.1, 00:20:36

C.

r>i202.110.101.0    202.110.101.1            0    100      0 i

R3#show ip ro

B    202.110.100.0/24 [200/0] via 202.110.101.1, 00:00:25

对于为什么是这种结果，在下一篇博文中将有详细解释。

     本文转自shenleigang 51CTO博客，原文链接：http://blog.51cto.com/shenleigang/152609，如需转载请自行联系原作者