基于ensp的BGP实验3

布满荆棘的人生 2023-02-09 13:12 124阅读 0赞

BGP实验3  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center]  
图1 实验组网图

配置各个路由器的IP  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 1]  
图2 配置路由器IP

\[Huawei\]interface Ethernet 0/0/1  
\[Huawei-Ethernet0/0/1\]ip add 40.0.0.1 24  
\[Huawei-Ethernet0/0/1\]interface Ethernet 0/0/0  
\[Huawei-Ethernet0/0/0\]ip add 30.0.0.2 24  
\[Huawei-Ethernet0/0/0\]quit  
上面以R2为例，以相似的方法配置其他路由器  
配置OSPF  
![在这里插入图片描述][20200518213725587.png_pic_center]  
图3 配置OSPF

\[Huawei\]ospf  
\[Huawei-ospf-1\]area 0  
\[Huawei-ospf-1-area-0.0.0.0\]network 40.0.0.0 0.0.0.255  
\[Huawei-ospf-1-area-0.0.0.0\]network 30.0.0.0 0.0.0.255  
\[Huawei-ospf-1-area-0.0.0.0\]q  
上面以R2为例，以相似的方法配置其他路由器  
配置BGP  
![在这里插入图片描述][20200518214137925.png_pic_center]  
图4 配置BGP

\[Huawei\]bgp 100  
\[Huawei-bgp\]peer 40.0.0.2 as-number 200  
\[Huawei-bgp\]peer 30.0.0.1 as-number 100  
\[Huawei-bgp\]import-route direct  
\[Huawei-bgp\]import-route ospf 1  
\[Huawei-bgp\]q  
\[Huawei\]ospf  
\[Huawei-ospf-1\]import-route bgp  
上面以R2为例，以相似的方法配置其他路由器

R8 ping R1 测试连通性，并且抓包，发现请求包和回复包都只经过R9路由器而不经过R2路由器。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 2]  
图5 R8 ping R1

在R9和R2 分别抓包  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 3]  
图6 R9路由器抓包

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 4]  
图7 R2路由器抓包

配置MED和 local-preference，改变优先级。  
MED越大，优先级越低，local-preference，越大，优先级越高  
\[Huawei\]route-policy med permit node 10  
\[Huawei-route-policy\]apply cost + 500  
\[Huawei-route-policy\]quit  
\[Huawei\]bgp 100  
\[Huawei-bgp\]peer 10.0.0.1 route-policy med export  
\[Huawei-bgp\]q  
\[Huawei\]q  
reset bgp all  
system-view  
\[Huawei\]route-policy local-preference permit node 10  
\[Huawei-route-policy\]apply local-preference 200  
\[Huawei-route-policy\]q  
\[Huawei\]bgp 100  
\[Huawei-bgp\]peer 20.0.0.2 route-policy local-preference export  
查看BGP路由表  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 5]  
图8 R1路由器BGP路由表  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 6]  
图9 R8路由器BGP路由表

R8 ping R1  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 7]  
图10 R8路由器再次ping R1 路由器

![在这里插入图片描述][202005182139051.png_pic_center]  
图11 R2路由器R9路由器抓包

在设置MED和 local-preference之后，R8 ping R1请求包经过R9到达R1，R1的回复包经过R2到达R8。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 8]  
图12 报文路径示意图

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