BGP对等体组实验<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

一、 实验目的
使用bgp对等体组最简化配置
二、 拓扑结构图
<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" />
三、 实验步骤
1.        配置基本接口地址
步骤略
测试：ispa1(config-if)#do ping 192.168.1.6
isp2(config-if)#do ping 172.24.1.17  基本接口0配置成功
2.        配置BGP
isp2(config)#router bgp 300
isp2(config-router)#neigh 172.24.1.7 remote-as 100
isp2(config-router)#net <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />3.0.0.0

 

ispa1(config)#router bgp 200
ispa1(config-router)#neigh 192.168.1.6 remote-as 100
ispa1(config-router)#net 1.0.0.0
3.        在sanjose3配置对等体组来简化配置
sanjose3(config)#router bgp 100
sanjose3(config-router)#net 2.0.0.0
sanjose3(config-router)#neigh ebgp-peers peer-group
sanjose3(config-router)#neigh ebgp-peers send-community
sanjose3(config-router)#neigh ebgp-peers route-map external out
sanjose3(config-router)#neigh 192.168.1.5 remote-as 200
sanjose3(config-router)#neigh 172.24.1.18 remote-as 300
sanjose3(config-router)#neigh 192.168.1.5 peer-group ebgp-peers
sanjose3(config-router)#neigh 172.24.1.18 peer-group ebgp-peers
sanjose3(config-router)#exit
sanjose3(config)#route-map external 10
sanjose3(config-route-map)#set community 40
4.        验证结果
ispa1#show ip route
C    1.0.0.0/8 is directly connected, Loopback0
B    2.0.0.0/8 [20/0] via 192.168.1.6, 00:01:24

     192.168.1.0/30 is subnetted, 1 subnets
C       192.168.1.4 is directly connected, Serial0/0

 

ispa1#show ip bgp
   Network          Next Hop            Metric LocPrf Weight Path
*> 1.0.0.0          0.0.0.0                  0         32768 i
*> 2.0.0.0          192.168.1.6              0             0 100 i
*> 3.0.0.0          192.168.1.6                            0 100 300 i

 

ispa1#show ip bgp 2.0.0.0
BGP routing table entry for 2.0.0.0/8, version 5
Paths: (1 available, best #1, table Default-IP-Routing-Table)
  Not advertised to any peer
  100
    192.168.1.6 from 192.168.1.6 (2.0.0.1)
      Origin IGP, metric 0, localpref 100, valid, external, best
      Community: 40

 

       sanjose3#show ip bgp nei
BGP neighbor is 172.24.1.18,  remote AS 300, external link
 Member of peer-group ebgp-peers for session parameters

  BGP version 4, remote router ID 3.0.0.1
  BGP state = Established, up for 00:02:39
  Last read 00:00:39, hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:
    Route refresh: advertised and received(old & new)
    Address family IPv4 Unicast: advertised and received