使用BGP,按照真实网络环境的逻辑配置,实现所有PC段间互相连通
1.配置ip 2.相邻as间配置EBGP,as间使用ibgp 3.修改,改善
配置命令
[r1-LoopBack0]ip add 1.1.1.1 24
[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24
[r1-GigabitEthernet0/0/1]ip add 192.168.1.1 24
[r2-LoopBack0]ip add 2.2.2.2 24
[r2-GigabitEthernet0/0/0]ip add 12.1.1.2 24
[r2-GigabitEthernet0/0/1]ip add 23.1.1.1 24
[r2-GigabitEthernet0/0/2]ip add 192.168.2.1 24
[r3-LoopBack0]ip add 3.3.3.3 24
[r3-GigabitEthernet0/0/0]ip add 23.1.1.2 24
[r3-GigabitEthernet0/0/2]ip add 192.168.3.1 24
[r3-GigabitEthernet0/0/1]ip add 34.1.1.1 24
[r4-LoopBack0]ip add 4.4.4.4 24
[r4-GigabitEthernet0/0/0]ip add 34.1.1.2 24
[r4-GigabitEthernet0/0/1]ip add 45.1.1.1 24
[r4-GigabitEthernet0/0/2]ip add 192.168.4.1 24
[r4-GigabitEthernet4/0/0]ip add 45.1.2.1 24
[r5-LoopBack0]ip add 5.5.5.5 24
[r5-GigabitEthernet0/0/0]ip add 45.1.1.2 24
[r5-GigabitEthernet0/0/1]ip add 192.168.5.1 24
[r5-GigabitEthernet0/0/2]ip add 45.1.2.2 24
AS间配置ospf协议(最左边右边不配置宣告)(直连可直接连接)
[r2-ospf-1-area-0.0.0.0]network 23.1.1.1 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 192.168.2.1 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 23.1.1.2 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 192.168.3.1 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 34.1.1.1 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 192.168.4.1 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 34.1.1.2 0.0.0.0
配置BGP
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2
[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.1.1.1 as-number 1
[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-number 2
[r3-bgp]peer 2.2.2.2 connect-interface lo 0
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
r4到r5之间需要配置静态路由(多路链接)
[r4]ip route-static 5.5.5.0 24 45.1.1.2
[r4]ip route-static 5.5.5.0 24 45.1.2.2
[r5]ip route-static 4.4.4.0 24 45.1.1.1
[r5]ip route-static 4.4.4.0 24 45.1.2.1
[r4]bgp 2
[r4-bgp]peer 5.5.5.5 as-number 3
[r4-bgp]peer 5.5.5.5 connect-interface lo 0
[r4-bgp]peer 5.5.5.5 ebgp-max-hop 2
(提高跳数,可以到达环回)
[r5]bgp 3
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 4.4.4.4 as-number 2
[r5-bgp]peer 4.4.4.4 connect-interface lo 0
[r5-bgp]peer 4.4.4.4 ebgp-max-hop 2
BGP宣告(逐条)
[r1]bgp 1
[r1-bgp]network 192.168.1.0 24
[r2-bgp]network 192.168.2.0 24
[r3-bgp]network 192.168.3.0 24
[r4-bgp]network 192.168.4.0 24
[r5-bgp]network 192.168.5.0 24
宣告r3无法*>,改r2下一跳为本地
[r2]bgp 2
[r2-bgp]peer 3.3.3.3 next-hop-local
[r2-bgp]peer 4.4.4.4 next-hop-local
[r4-bgp]peer 3.3.3.3 next-hop-local
[r4-bgp]peer 2.2.2.2 next-hop-local
3的BGP水平分割,无法传递给r4,r2和r4连
(IBGP传递属性不变,EBGP属性变化)
[r2-bgp]peer 4.4.4.4 as-number 2
[r2-bgp]peer 4.4.4.4 connect-interface lo 0
[r4-bgp]peer 2.2.2.2 as-number 2
[r4-bgp]peer 2.2.2.2 connect-interface lo 0
配置结果
调式
179服务端口,50870客户端
dis bgp peer
查看BGP库 dis bgp peer dis bgp routing-table