一、拓扑图
二、BGP基本配置：
1、配置两台路由器的IP地址，保证直连链路的连通性。
2、配置两台路由器的BGP协议：
1、配置两台路由器的IP地址，保证直连链路的连通性。
2、配置两台路由器的BGP协议：
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R1(config-if)#router bgp 64512
R1(config-router)#net 10.1.255.0 mask 255.255.255.252
R1(config-router)#net 172.16.1.0 mask 255.255.255.0
R1(config-router)#nei 10.1.255.2 remote 64513
R2(config)#router bgp 64513
R2(config-router)#net 10.1.255.0 mask 255.255.255.252
R2(config-router)#net 192.168.1.0 mask 255.255.255.0
R2(config-router)#nei 10.1.255.1 remote 64512
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3、查看一下R1和R2的BGP路由表，能学到对方的BGP路由：
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R1#sh ip route bgp
B 192.168.1.0/24 [20/0] via 10.1.255.2, 00:09:20
R2#sh ip route bgp
172.16.0.0/24 is subnetted, 1 subnets
B 172.16.1.0 [20/0] via 10.1.255.1, 00:10:17
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三、配置BGP的邻居认证：
1、先在R1上做上邻居认证，并设置密码为supercisco：
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R1(config)#router bgp 64512
R1(config-router)#nei 10.1.255.2 password supercisco
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2、发现一配置上去就有反映了：
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*Mar 1 00:40:15.767: %TCP-6-BADAUTH: No MD5 digest from 10.1.255.2(59707) to 10.1.255.1(179)
*Mar 1 00:40:16.287: %TCP-6-BADAUTH: No MD5 digest from 10.1.255.2(59707) to 10.1.255.1(179)
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3
、查看一下简单BGP汇总：
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R1#sh ip bgp summary
………………
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.255.2 4 64513 42 46 0 0 0 00:00:43 Active
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4
、查看一下BGP路由表，发现没有172.16.1.0/24的路由：
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R2#sh ip route
………………
10.0.0.0/30 is subnetted, 1 subnets
C 10.1.255.0 is directly connected, Serial1/0
C 192.168.1.0/24 is directly connected, Loopback0 (没有学到R1的BGP路由)
R2#sh ip bgp
BGP table version is 7, local router ID is 192.168.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.255.0/30 0.0.0.0 0 32768 i
*> 192.168.1.0 0.0.0.0 0 32768 i(没有R1 loopback BGP路由存在)
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5、再到R2去配上邻居认证：
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R2(config)#router bgp 64513
R2(config-router)#nei 10.1.255.1 password supercisco
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四、验证邻居认证：
1、一配置上去，发现邻居马上就起来了：
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R2(config-router)#
*Mar 1 00:53:36.203: %BGP-5-ADJCHANGE: neighbor 10.1.255.1 Up
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2、到R2上看一下BGP 简单汇总和BGP路由：
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R2#sh ip bgp summary
……………………
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.255.1 4 64512 58 57 8 0 0 00:07:09 2 （通过邻居学到了两条）
R2#sh ip bgp
BGP table version is 9, local router ID is 192.168.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.255.0/30 0.0.0.0 0 32768 i
*> 192.168.1.0 0.0.0.0 0 32768 i
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3、看一下的路由表,两边都有了：
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R1#sh ip route
………………
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.1.0 is directly connected, Loopback0
10.0.0.0/30 is subnetted, 1 subnets
C 10.1.255.0 is directly connected, Serial1/1
B 192.168.1.0/24 [20/0] via 10.1.255.2, 00:01:41
R2#sh ip route
………………
172.16.0.0/24 is subnetted, 1 subnets
B 172.16.1.0 [20/0] via 10.1.255.1, 00:01:54
10.0.0.0/30 is subnetted, 1 subnets
C 10.1.255.0 is directly connected, Serial1/0
C 192.168.1.0/24 is directly connected, Loopback0
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本文转自wxs-163 51CTO博客，原文链接:http://blog.51cto.com/supercisco/269372
