BGP default-information originate 实验

 
实验拓朴:
 
 
 

 

实验配置:
R1 R2 基本 EBGP 邻居关系
 
实验现象:
1.  R2  BGP 配置 default-in originate
R1#sh ip bgp
 
R2#sh ip bgp
 
R1 R2  Bgp 表里为空 .
 
 
2.  R2  BGP 配置 default-in originate ,并配置静态路由 ip route 0.0.0 .0 0.0.0.0 s1/1
R1#sh ip bgp
 
R2#sh ip bgp
 
R2#sh ip route st
S*   0.0.0 .0/0 is directly connected, Serial1/1
 
R1 R2  Bgp 表里仍为空 .
 
 
3.  R2 配置 ip route 0.0.0 .0 0.0.0.0 s1/1 , 并在 BGP 中重分布静态路由 .
2 结果
 
 
4.  R2  BGP 配置 default-in originate  + 重分布静态 ,并配置静态路由 ip route 0.0.0 .0 0.0.0.0 s1/1  .
R1#sh ip bgp
BGP table version is 2, local router ID is 1.1.1 .1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
 
   Network          Next Hop            Metric LocPrf Weight Path
*> 0.0.0 .0          10.1.12 .2                0             0 2 ?
R1#
 
R2#sh ip bgp
BGP table version is 2, local router ID is 2.2.2 .2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
 
   Network          Next Hop            Metric LocPrf Weight Path
*> 0.0.0 .0          0.0.0 .0                  0         32768 ?
R3#
 
R1 R2 BGP 表里出现默认路由 0.0.0 .0 .
 
 
实验结论:
 
We have demonstrated that advertising a default route via BGP requires three steps:
Step 1. Create a static default route.  
配置静态默认路由
Step 2. Redistribute static into BGP. 
重分布静态进入BGP
Step 3. Use the BGP command default-information originate. 
使用BGP default-information originate 命令
 
 

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