实验条件

网络拓朴

实验目的

将R1配置成Listen状态，自动接收来自其它路由器的建邻居请求、建立邻居

开始配置

配置动态路由协议

这里用EIGRP来配置，保证网络的可达性，事实上面的拓扑结构来说，不需要配置动态路由协议，他们本身就是同一个网络。

R1：
router eigrp 1
 router-id 1.1.1.1
 network 10.1.1.0 0.0.0.255

R2：
router eigrp 1
 router-id 2.2.2.2
 network 10.1.1.0 0.0.0.255
R3：
router eigrp 1
 router-id 3.3.3.3
 network 10.1.1.0 0.0.0.255

配置BGP

R1：

R1#show run | s router bgp
router bgp 1
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 bgp listen range 10.1.1.0/24 peer-group CCIE
 !最大允许建立的邻居数
 bgp listen limit 105
 neighbor CCIE peer-group
 neighbor CCIE remote-as 1
 neighbor CCIE next-hop-self

R2#show run | s router bgp
router bgp 1
 bgp router-id 2.2.2.2
 neighbor 10.1.1.1 remote-as 1
 neighbor 10.1.1.1 next-hop-self

R3#show run | s router bgp
router bgp 1
 bgp router-id 3.3.3.3
 neighbor 10.1.1.1 remote-as 1
 neighbor 10.1.1.1 next-hop-self

检查邻居配置

R1上：自动与R2和R3分别形成了IBGP邻居关系

R1(config-router)#do show ip bgp summary
BGP router identifier 1.1.1.1, local AS number 1
BGP table version is 1, main routing table version 1

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
*10.1.1.2       4            1       5       5        1    0    0 00:01:43        0
*10.1.1.3       4            1       4       3        1    0    0 00:01:31        0
* Dynamically created based on a listen range command
Dynamically created neighbors: 2, Subnet ranges: 1

BGP peergroup CCIE listen range group members: 
  10.1.1.0/24 

Total dynamically created neighbors: 2/(105 max), Subnet ranges: 1

R1(config-router)#