« Back
in BGP 路由 思科 read.

BGP default-information originate 实验

实验拓扑:

R1-R2-R3

实验配置:
R1和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和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和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.

同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和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