思科12008路由器与联通起BGP进行案例

1、网络拓扑

2 GZ12008配置注意：
1）确定AS号：铁通AS号，gz12008的AS号，联通的AS号
2）建立EBGP邻居用物理接口，还是用回环接口

3 使用回环口建立邻居EBGP邻居
第一，IGP配通，用静态路由指通
conf t
host gdtt
inter f0/0
ip add 202.192.168.1 255.255.255.252
no shut
inter lo0
ip add 1.1.1.1 255.255.255.0
exit
ip route 2.2.2.2 255.255.255.255 f0/0

conf t
host gz12008
inter f0/0
ip add 202.192.168.2 255.255.255.252
no shut
inter lo0
ip add 2.2.2.2 255.255.255.255
inter f2/0
ip add 202.192.100.1 255.255.255.252
no shut

conf t
host union
inter f2/0
ip add 202.192.100.2 255.255.255.252
no shut
inter lo0
ip add 3.3.3.3 255.255.255.0
exit
ip route 2.2.2.2 255.255.255.255 f2/0

第二，起GBP进程
第三，用回环接口建立邻居
第四，指定更新源为回环接口
第五，发布网络
router bgp 1
Neighbor 2.2.2.2 remote-as 2
network 1.1.1.0 255.255.255.0
Neighbor 2.2.2.2 ebgp-multihop 3

router bgp 2
Neighbor 202.192.168.1 remote-as 1
Neighbor 202.192.100.2 remote-as 3
Neighbor 202.192.168.1 update-source loopback0
Neighbor 202.192.100.2 update-source loopback0
//
Neighbor 202.192.168.1 ebgp-multihop 3
Neighbor 202.192.100.2 ebgp-multihop 3

router bgp 3
Neighbor 2.2.2.2 remote-as 2
network 3.3.3.0 255.255.255.0
Neighbor 2.2.2.2 ebgp-multihop 3